Gap eliminating mechanism for deep air conditioning focusing assembly and pre-tightening force determining method
By employing a combination of pressure plate, spring, and nut in the deep space exploration zoom camera, stable centering of the lens barrel and improved imaging quality are achieved under extreme temperature conditions. This solves the problems of optical axis offset and focal length drift in deep space exploration and is suitable for lightweight aerospace optical systems.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- XIAN INST OF OPTICS & PRECISION MECHANICS CHINESE ACAD OF SCI
- Filing Date
- 2026-03-09
- Publication Date
- 2026-05-08
AI Technical Summary
When the ambient temperature changes, the cam zoom mechanism of the deep space exploration zoom camera causes optical axis shift and focal length drift due to changes in the clearance of the moving parts, which affects the imaging quality and repeatability. In the existing technology, extending the axial length of the moving lens barrel increases the mass, and the rolling guide mechanism is not suitable for lightweight systems.
The system employs a combination of pressure plates, springs, and nuts. The springs provide radial preload, ensuring that the pressure plates remain in contact with the inner wall of the main lens barrel. Three sets of gap-eliminating mechanisms are evenly distributed along the circumference of the moving lens barrel, forming symmetrical support. The spring preloads cancel each other out radially, ensuring the centering and stability of the lens barrel.
It effectively eliminates radial clearance caused by processing, assembly and thermal deformation, improves optical axis stability and imaging quality, adapts to extreme temperature environments, has a simple structure and occupies little space, and is suitable for aerospace optical systems with limited size and mass.
Smart Images
Figure CN121995594A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of aerospace camera technology and relates to a gap elimination mechanism and a method for determining preload force for deep-sea focusing components. Background Technology
[0002] In zoom lenses, a cam mechanism is typically used to achieve the zoom function. During zooming, the outer cam rotates, and the lens barrel is moved by a guide pin, simultaneously moving linearly along the cam curve to ensure that the image plane remains unchanged while the focal length changes. Cam-type zoom mechanisms are widely used in optical zoom lenses due to their simple, compact structure and ease of manufacturing and adjustment.
[0003] Focusing on the cam zoom mechanism for deep space exploration, when the ambient temperature changes, considering the cold welding effect and the difference in thermal expansion coefficients due to the use of different materials for the moving parts, the clearance between the moving parts changes accordingly. This can cause slight tilting and wobbling of the lens frame, leading to optical axis shift and focal length drift, thus affecting image quality and zoom repeatability. In existing technologies, extending the axial length of the moving group lens barrel does not reduce radial translation error, and extending the length of the moving group increases mass. Using a rolling guide mechanism results in a large volume, making it unsuitable for lightweight systems. Summary of the Invention
[0004] The purpose of this invention is to provide a gap-eliminating mechanism and a preload determination method for deep-space zoom components, so as to solve the problems of gaps, optical axis wobble and thermal drift in the guide pair of the moving group of existing deep-space zoom cameras.
[0005] To achieve the above objectives, the present invention employs the following technical solution: In a first aspect, this application discloses a gap-eliminating mechanism for a deep focusing assembly, including a pressure plate seat, the pressure plate seat being fixed to the outer wall of the movable lens barrel of the deep focusing assembly, a pressure plate being provided on the pressure plate seat, the pressure plate contacting the inner wall of the main lens barrel of the deep focusing assembly, a spring being provided between the pressure plate seat and the pressure plate, the pressure plate passing through the spring and the pressure plate seat and being assembled with a nut for adjusting the preload.
[0006] Preferably, the pressure plate includes a pressing surface and two connecting posts. The two connecting posts are fixed below the pressing surface. The pressing surface contacts the inner wall of the main lens barrel of the deep focusing assembly. The two connecting posts are threaded and are assembled with a nut through a spring and a pressure plate seat.
[0007] Preferably, the spring is in a compressed state within the gap-eliminating mechanism, and the compression of the spring is greater than the maximum assembly gap of the deep-sea coking assembly.
[0008] Preferably, the compression of the spring satisfies the following formula:
[0009] in, This is the spring compression. This is the maximum assembly clearance between the main lens barrel and the lens frame.
[0010] Preferably, the spring stiffness satisfies the following requirement:
[0011] in, For spring stiffness; For the quality of the frames; The maximum disturbance angular frequency; This is for the safety factor.
[0012] Secondly, this application discloses a deep-air focusing assembly, including the gap elimination mechanism for the deep-air focusing assembly described in any one of the above claims. The gap elimination mechanism is provided in three sets, which are evenly arranged along the circumference of the moving lens barrel to form symmetrical support.
[0013] Preferably, it also includes a cam and a guide pin; the movable lens barrel is installed in the inner hole of the main lens barrel, and three sets of gap elimination mechanisms are evenly arranged between the movable lens barrel and the main lens barrel along the circumference of the movable lens barrel; the cam is mounted on the outer wall of the main lens barrel, and a cam curve groove is opened on the outer wall of the main lens barrel, and the guide pin passes through the cam curve groove and is fixed on the movable lens barrel.
[0014] Preferably, the radial resultant force of the three sets of gap-eliminating mechanisms satisfies the following condition:
[0015] in, The radial resultant force of the three sets of spring mechanisms; To guide the friction coefficient of the pair; This represents the maximum thrust of the zoom drive mechanism; The driving torque safety factor; The friction force is from three sets of springs.
[0016] Preferably, the preload of the three sets of gap elimination mechanisms does not exceed ±10% within a temperature range of -20℃ to +55℃.
[0017] Thirdly, this application discloses a method for determining the preload of a gap-eliminating mechanism for a deep-sea coking assembly as described in any one of the above claims. The gap-eliminating mechanism is provided in three sets in the deep-sea coking assembly. The preload of the three sets of gap-eliminating mechanisms is determined through the following steps: Obtain the kinematic pair material parameters, lens frame mass, maximum external disturbance angular frequency, maximum thrust of zoom drive mechanism, working environment temperature and initial design environment temperature in the deep-focusing assembly; The temperature variation is determined based on the material parameters of the kinematic pair in the deep-sea focusing assembly, the lens frame mass, the maximum external disturbance angular frequency, the maximum thrust of the zoom drive mechanism, the operating ambient temperature, and the initial design ambient temperature. The preload provided by the spring:
[0018]
[0019]
[0020] In the formula, For temperature change The preload force provided by the spring; The temperature coefficient of the spring shear modulus; For spring stiffness; The difference in the coefficients of thermal expansion between the main lens barrel and the frame; The free length of the spring; The radial resultant force provided by the three sets of spring mechanisms; To guide the friction coefficient of the pair; This represents the maximum thrust of the zoom drive mechanism; The driving torque safety factor; For the quality of the frames; The maximum disturbance angular frequency; For safety factor; Operating ambient temperature; This is the initial design ambient temperature.
[0021] Compared with the prior art, the present invention has the following beneficial effects: This application discloses a gap-eliminating mechanism for a deep-space focusing assembly. Through a radial preload provided by a spring, the pressure plate remains in contact with the inner wall of the main lens barrel, effectively eliminating radial gaps caused by machining, assembly, and thermal deformation. This suppresses wobbling of the moving lens barrel during zooming, improving optical axis stability and image quality. The working height of the spring is adjusted using a nut, allowing for flexible adjustment of the preload according to actual working conditions, facilitating assembly, adjustment, and maintenance, and adapting to the needs of different working environments. Even with changes in ambient temperature, the spring maintains contact between the pressure plate and the main lens barrel through elastic deformation, compensating for gap changes caused by differences in thermal expansion coefficients, ensuring stable operation even in extreme temperature environments such as deep space exploration. Furthermore, this mechanism has a simple structure, occupies little space, and is easy to integrate into existing zoom camera structures, making it particularly suitable for aerospace optical systems with strict limitations on size and weight.
[0022] This application discloses a deep-space focusing assembly with three sets of gap-eliminating mechanisms evenly distributed along the circumference. The spring preload cancels each other out radially, forming a force-closed system that keeps the moving lens barrel always centered on the main lens barrel. Automatic centering is achieved without additional guiding structures, significantly improving the alignment accuracy of the optical axis. The three mechanisms simultaneously apply radial constraints to the moving lens barrel from three directions, effectively suppressing translation and tilting in any direction within the X and Y planes. This overcomes dead zones or torque imbalances inherent in single-point or two-point supports, greatly improving motion stability during zooming. The symmetrical support structure increases the lateral natural frequency of the lens frame, making it less prone to resonance or deflection under external vibration or impact, effectively ensuring imaging stability under complex conditions such as deep space exploration. The three mechanisms operate independently; even if one fails due to extreme environments or unexpected factors, the other two can still provide a certain degree of radial constraint, preventing complete lens frame instability and enhancing the system's survivability and reliability during long-term missions. Attached Figure Description
[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention 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.
[0024] Figure 1 This is a cross-sectional view of the deep-air conditioning coking assembly according to an embodiment of the present invention; Figure 2 This is a perspective view of the deep-air conditioning coking assembly according to an embodiment of the present invention; Figure 3 This is a side view of the deep-focusing assembly according to an embodiment of the present invention; Figure 4 This is a cross-sectional view of a gap-eliminating mechanism for a deep-sea coking assembly according to an embodiment of the present invention; Figure 5 This is a flowchart illustrating the preload determination process of the gap-eliminating mechanism according to an embodiment of the present invention.
[0025] Wherein: 1-moving lens barrel; 2-main lens barrel; 3-cam; 4-guide pin; 5-pressure plate; 6-spring; 7-pressure plate seat; 8-nut; 9-gap elimination mechanism; 901-first gap elimination mechanism; 902-second gap elimination mechanism; 903-third gap elimination mechanism. Detailed Implementation
[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0027] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.
[0028] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0029] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0030] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0031] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.
[0032] The present invention will now be described in further detail with reference to the accompanying drawings: See Figure 4This application discloses a gap-eliminating mechanism for a deep focusing assembly, including a pressure plate seat 8, which is fixed to the outer wall of the movable lens barrel 1 of the deep focusing assembly. A pressure plate 5 is disposed on the pressure plate seat 8, and the pressure plate 5 contacts the inner wall of the main lens barrel 2 of the deep focusing assembly. A spring 6 is disposed between the pressure plate seat 8 and the pressure plate 5. The pressure plate 5 passes through the spring 6 and the pressure plate seat 8 and is assembled with a nut 7 for adjusting the preload. By setting a pressure plate seat on the outer wall of the movable lens barrel and cooperating with the assembly structure of the pressure plate, spring and nut, precise compensation and control of the radial gap between the movable lens barrel and the main lens barrel can be achieved. This mechanism has significant advantages in improving the environmental adaptability, structural stability and imaging reliability of the optical system, and has high engineering application value.
[0033] In some embodiments, the pressure plate 5 includes a pressing surface and two connecting posts. The two connecting posts are fixed below the pressing surface, and the pressing surface contacts the inner wall of the main lens barrel 2 of the deep-space focusing assembly. The two connecting posts are threaded and pass through a spring 6 and a pressure plate seat 8 to be assembled with a nut 7. By configuring springs 6 on the two independent connecting posts on the pressure plate 5, the original single-point contact is transformed into a two-point elastic support. When the nut 7 is tightened, the spring 6 is compressed, generating a counterforce that pushes the pressing surface of the pressure plate 5 to remain in contact with the inner wall of the main lens barrel 2. This design utilizes the energy storage characteristics of the springs to convert the preload into a continuous radial constraint, thereby compensating for gaps caused by processing errors, assembly deviations, or thermal deformation during zooming in real time. The parallel arrangement of the two connecting posts makes the force more balanced, avoiding the potential for off-center loading or torque imbalance at a single contact point. The elastic compensation mechanism of the springs allows the mechanism to maintain the stability of the preload under temperature fluctuations from -20°C to +55°C in the deep-space environment, preventing contact failure due to differences in thermal expansion coefficients. Meanwhile, the arc-shaped contact design of the pressing surface reduces the risk of localized wear and extends the service life of the mechanism during long-term tasks.
[0034] In some embodiments, the spring 6 is compressed within the gap-eliminating mechanism, and the compression of the spring 6 is greater than the maximum assembly gap of the deep-space coking assembly. This ensures that the spring is compressed under all circumstances, eliminating gaps. Furthermore, this design reduces the impact of temperature changes on the mechanism's stability; dimensional fluctuations caused by thermal expansion and contraction are entirely absorbed by the spring's deformation. Although the preload fluctuates, it does not disappear, ensuring reliability under the extreme temperatures of deep space.
[0035] In some embodiments, the compression of the spring 6 satisfies the following requirement:
[0036] in, This is the spring compression. This is the maximum assembly clearance between the main lens barrel and the lens frame.
[0037] In some embodiments, the spring stiffness of the spring 6 satisfies the following requirement:
[0038] in, For spring stiffness; For the quality of the frames; The maximum disturbance angular frequency; This is for the safety factor.
[0039] This application also discloses a deep-space focusing assembly, including the gap-eliminating mechanism 9 described in any one of the above claims for a deep-space focusing assembly. The gap-eliminating mechanism 9 is provided in three sets, which are evenly arranged along the circumference of the moving mirror tube 1 to form a symmetrical support. The symmetrical arrangement of the three sets of gap-eliminating mechanisms significantly improves structural stability, motion accuracy, and environmental adaptability, making it particularly suitable for deep-space exploration and remote sensing imaging systems with extremely high requirements for optical axis stability.
[0040] In some embodiments, a deep focusing assembly further includes a cam 3 and a guide pin 4; the movable lens barrel 1 is installed in the inner hole of the main lens barrel 2, and three sets of gap elimination mechanisms 9 are evenly arranged between the movable lens barrel 1 and the main lens barrel 2 along the circumference of the movable lens barrel 1; the cam 3 is installed on the outer wall of the main lens barrel 2, and a cam curve groove is opened on the outer wall of the main lens barrel 2, and the guide pin 4 passes through the cam curve groove and is fixed on the movable lens barrel 1.
[0041] In some embodiments, the radial resultant force of the three sets of gap-eliminating mechanisms 9 satisfies the following condition:
[0042] in, The radial resultant force of the three sets of spring mechanisms; To guide the friction coefficient of the pair; This represents the maximum thrust of the zoom drive mechanism; The driving torque safety factor; The friction force is from three sets of springs.
[0043] In some embodiments, the preload of the three sets of gap-eliminating mechanisms 9 varies by no more than ±10% within a temperature range of -20℃ to +55℃.
[0044] In some embodiments, see Figures 1-3 A deep-focusing assembly is a temperature-adaptive gap-eliminating cam zoom mechanism, comprising a movable lens barrel 1, a main lens barrel 2, a cam 3, a guide pin 4, a pressure plate 5, a spring 6, a nut 7, a pressure plate seat 8, and a gap-eliminating mechanism 9. The movable lens barrel 1 is installed in the inner hole of the main lens barrel 2 and is precisely fitted with the inner surface of the main lens barrel 2. The cam 3 is installed on the outer cylinder of the main lens barrel 2 and is precisely fitted with the outer surface of the main lens barrel 2. The guide pin 4 is fixed on the movable lens barrel 1 and is precisely fitted with the curved groove of the cam 3. The pressure plate 5 passes through two springs 6 and the pressure plate seat 8. The working height of the spring can be adjusted by screwing on the nut 7 to form the gap elimination mechanism 9. The working height of the spring 6 is controlled by the engagement length of the nut 7 between the pressure plate 5 and the pressure plate seat 8, ensuring that the spring 6 always provides radial force during operation.
[0045] During zooming, cam 3 rotates under the drive of an external motor. Since guide pin 4 is restricted by a straight groove on the main lens barrel 2, as cam 3 rotates, guide pin 4 moves linearly along the optical axis under the drive of cam groove 3. Guide pin 4 is connected to the moving lens barrel 1 by a thread, so guide pin 4 and moving lens barrel 1 move linearly together, thereby achieving zooming.
[0046] Due to the space cold welding and the different thermal expansion coefficients of the materials, and taking into account errors in processing and assembly, the movable lens barrel 1 and the main lens barrel 2 are designed with a gap, which causes the movable lens barrel 1 to wobble during zooming. However, due to the action of the gap elimination mechanism 9, the pressure plate 5 is always in close contact with the inner surface of the main lens barrel 2, reducing the amount of shaking.
[0047] When the ambient temperature changes, the spring 6 can still ensure that the pressure plate 5 and the main lens barrel 2 are in full contact through elastic deformation.
[0048] The method for determining the spring preload parameter in the above scheme includes the following steps: Gap compensation conditions:
[0049] in, The spring compression is measured in mm. This is the maximum assembly clearance (mm) between the main lens barrel and the frame, which includes clearance errors from machining, assembly, and thermal deformation in space; therefore, a clearance margin of 0.3 is used. This relationship ensures that the spring compression is greater than the clearance, guaranteeing a constant positive preload.
[0050] Dynamic stability conditions of optical axis: To avoid the frame being disturbed at the frequency Resonance occurs below, requiring:
[0051] Where m is the mass of the frame (g); The maximum disturbance angular frequency (rad / s); For safety, a factor of 3 is typically used. This formula ensures that the natural frequency of the frame's lateral direction is 3 times higher than the external excitation frequency, thereby effectively suppressing optical axis jitter.
[0052] Balance condition between friction and driving torque:
[0053] in, The radial resultant force (N) provided for the three sets of spring mechanisms; To guide the friction coefficient of the pair; The maximum thrust (N) of the zoom drive mechanism; This is the safety factor for the driving torque.
[0054] Thermal environment correction model (considering the difference between spring modulus and structural thermal expansion when the temperature changes by ΔT):
[0055] in, The preload force (N) provided by the spring when the temperature changes by ΔT; The temperature coefficient of the spring shear modulus (1 / ℃); Spring stiffness (N / mm); The difference in thermal expansion coefficients between the main lens barrel and the lens frame (1 / ℃); The free length of the spring is (mm).
[0056] Therefore, this mechanism can eliminate the gap in the cam zoom mechanism, and has the advantages of good environmental adaptability, compact structure, simple assembly and adjustment, and good imaging quality.
[0057] See Figure 5 This application also discloses a method for determining the preload of the gap-eliminating mechanism for a deep-sea coking assembly as described in any one of the above claims. The gap-eliminating mechanism 9 is provided in three sets in the deep-sea coking assembly. The preload of the three sets of gap-eliminating mechanisms is determined by the following steps: Obtain the kinematic pair material parameters, lens frame mass, maximum external disturbance angular frequency, maximum thrust of zoom drive mechanism, working environment temperature and initial design environment temperature in the deep-focusing assembly; The temperature variation is determined based on the material parameters of the kinematic pair in the deep-sea focusing assembly, the lens frame mass, the maximum external disturbance angular frequency, the maximum thrust of the zoom drive mechanism, the operating ambient temperature, and the initial design ambient temperature. The preload provided by the spring:
[0058]
[0059]
[0060] In the formula, For temperature change The preload force provided by the spring; The temperature coefficient of the spring shear modulus; For spring stiffness; The difference in the coefficients of thermal expansion between the main lens barrel and the frame; The free length of the spring; The radial resultant force provided by the three sets of spring mechanisms; To guide the friction coefficient of the pair; This represents the maximum thrust of the zoom drive mechanism; The driving torque safety factor; For the quality of the frames; The maximum disturbance angular frequency; For safety factor; Operating ambient temperature; This is the initial design ambient temperature.
[0061] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.
Claims
1. A gap-eliminating mechanism for deep-sea coking assemblies, characterized in that, Includes a pressure plate holder (8), which is fixed to the outer wall of the movable lens barrel (1) of the deep focusing assembly. A pressure plate (5) is provided on the pressure plate holder (8), and the pressure plate (5) contacts the inner wall of the main lens barrel (2) of the deep focusing assembly. A spring (6) is provided between the pressure plate holder (8) and the pressure plate (5). The pressure plate (5) passes through the spring (6) and the pressure plate holder (8) and is assembled with a nut (7) for adjusting the preload.
2. The gap elimination mechanism for a deep-sea coking assembly according to claim 1, characterized in that, The pressure plate (5) includes a pressing surface and two connecting columns. The two connecting columns are fixed below the pressing surface. The pressing surface is in contact with the inner wall of the main lens barrel (2) of the deep focusing assembly. The two connecting columns are threaded and are assembled with a nut (7) through a spring (6) and a pressure plate seat (8).
3. The gap elimination mechanism for a deep-sea coking assembly according to claim 1, characterized in that, The spring (6) is compressed in the gap elimination mechanism, and the compression of the spring (6) is greater than the maximum assembly gap of the deep-air coking assembly.
4. A gap-eliminating mechanism for a deep-sea coking assembly according to claim 3, characterized in that, The compression of the spring (6) satisfies the following requirement: in, This is the spring compression. This is the maximum assembly clearance between the main lens barrel and the lens frame.
5. A gap-eliminating mechanism for a deep-sea coking assembly according to claim 1, characterized in that, The spring stiffness of the spring (6) satisfies the following requirement: in, For spring stiffness; For the quality of the frames; The maximum disturbance angular frequency; This is for the safety factor.
6. A deep-air coking assembly, characterized in that, Includes the gap elimination mechanism (9) for deep-sea air-focusing assembly as described in any one of claims 1 to 5, wherein the gap elimination mechanism (9) is provided in three sets, and the three sets of gap elimination mechanisms (9) are evenly arranged along the circumference of the moving lens barrel (1) to form symmetrical support.
7. A deep-air coking assembly according to claim 6, characterized in that, It also includes a cam (3) and a guide pin (4); the movable lens tube (1) is installed in the inner hole of the main lens tube (2), and three sets of gap elimination mechanisms (9) are evenly arranged between the movable lens tube (1) and the main lens tube (2) along the circumference of the movable lens tube (1); the cam (3) is installed on the outer wall of the main lens tube (2), and a cam curve groove is opened on the outer wall of the main lens tube (2), and the guide pin (4) passes through the cam curve groove and is fixed on the movable lens tube (1).
8. A deep-air coking assembly according to claim 6, characterized in that, The radial resultant force of the three sets of gap-eliminating mechanisms (9) satisfies the following condition: in, The radial resultant force of the three sets of spring mechanisms; To guide the friction coefficient of the pair; This represents the maximum thrust of the zoom drive mechanism; The driving torque safety factor; The friction force is from three sets of springs.
9. A deep-air coking assembly according to claim 6, characterized in that, The preload of the three sets of gap elimination mechanisms (9) does not exceed ±10% within the temperature range of -20℃ to +55℃.
10. A method for determining the preload force of a gap-eliminating mechanism for a deep-sea coking assembly as described in any one of claims 1 to 5, characterized in that, The gap-eliminating mechanism (9) is provided in three sets in the deep-air-conditioned coking assembly. The preload of the three sets of gap-eliminating mechanisms is determined by the following steps: Obtain the kinematic pair material parameters, lens frame mass, maximum external disturbance angular frequency, maximum thrust of zoom drive mechanism, working environment temperature and initial design environment temperature in the deep-focusing assembly; The temperature variation is determined based on the material parameters of the kinematic pair in the deep-sea focusing assembly, the lens frame mass, the maximum external disturbance angular frequency, the maximum thrust of the zoom drive mechanism, the operating ambient temperature, and the initial design ambient temperature. The preload provided by the spring: In the formula, For temperature change The preload force provided by the spring; The temperature coefficient of the spring shear modulus; For spring stiffness; The difference in the coefficients of thermal expansion between the main lens barrel and the frame; The free length of the spring; The radial resultant force provided by the three sets of spring mechanisms; To guide the friction coefficient of the pair; This represents the maximum thrust of the zoom drive mechanism; The driving torque safety factor; For the quality of the frames; The maximum disturbance angular frequency; For safety factor; Operating ambient temperature; This is the initial design ambient temperature.