Aperture high-precision centering device and equipment thereof

Abstract

The invention relates to the field of centering mechanisms, in particular to an aperture high-precision centering device which comprises a shell, a centering mechanism and a centering mechanism. The movable shaft axially moves in the movable channel through a driving mechanism; the locking sleeve is arranged on the movable shaft in a sleeving mode and abuts against the top end of the shell; a plurality of first rolling bodies distributed in the circumferential direction are arranged between the movable shaft and the locking sleeve, a first stopping piece is arranged on the periphery of each first rolling body, and when the driving mechanism drives the movable shaft to move axially, the first rolling bodies move in the circumferential radial direction under the action of the locking sleeve and the conical surface of the movable shaft and the protection of the first stopping pieces so as to achieve centering. Compared with the prior art, an elastic deformation structure of a traditional expansion sleeve is replaced by the rigid rolling body, and the centering precision and reliability are remarkably improved by combining an axial driving and conical surface cooperative control mechanism and a limiting protection design.

Description

Technical Field

[0001] This application relates to the technical field of centering mechanisms, and particularly to a high-precision aperture centering device and its equipment. Background Art

[0002] With the increasingly strict requirements for the key feature profiles and dimensional accuracies of parking pawl parts in automotive gearboxes, traditional aperture centering mechanisms have become difficult to meet the high-precision positioning requirements. Taking a conventional expanding sleeve mechanism as an example, it relies on the deformation of elastic materials to achieve radial expansion, and there are significant defects: First, the creep and fatigue characteristics of elastic materials result in a repeated centering accuracy of only 0.01 - 0.02 mm, which cannot meet the stringent requirements of the automotive industry's ISO / TS 16949 standard that the repeatability of the measurement system should be less than 1 / 10 of the tolerance band (for example, when the tolerance band is 0.15 mm, the repeat positioning error is required to be ≤ 0.015 mm); Second, the expanding sleeve lacks a rigid limit protection mechanism and is prone to permanent deformation under frequent use or overload conditions, further reducing the positioning reliability; In addition, the non-linear characteristics of elastic deformation will produce an error superposition effect with the light source fluctuations of the laser measurement system, resulting in the deviation of the measurement result correlation from the quality control standard. Summary of the Invention

[0003] This application provides a high-precision aperture centering device and its equipment to solve the technical problem that the existing aperture centering mechanism is difficult to meet the high-precision positioning requirements of the dimensions of existing parking pawl-like parts.

[0004] In a first aspect, this application provides a high-precision aperture centering device, including: a housing, the housing is hollow along the axis to form a moving channel; a moving shaft, the moving shaft performs axial movement in the moving channel through a driving mechanism; a locking sleeve, the locking sleeve is sleeved on the moving shaft and abuts against the top end of the housing; A number of circumferentially distributed first rolling elements are provided between the moving shaft and the locking sleeve, and a first stop is provided on the outer periphery of the first rolling element. When the driving mechanism drives the moving shaft to perform axial movement, the first rolling element is affected by the conical surfaces of the locking sleeve and the moving shaft, and the protection of the first stop, and moves radially along the circumference to achieve centering.

[0005] Further, a number of circumferentially distributed second rolling elements are also provided at the abutting portion of the locking sleeve and the housing, and a second stop is provided on the outer periphery of the second rolling element. When the driving mechanism drives the moving shaft to perform axial movement, the second rolling element is affected by the conical surfaces of the locking sleeve and the housing, and the protection of the second stop, and moves radially along the circumference to achieve centering.

[0006] Furthermore, the two ends of the movable shaft are respectively a driving end and a working end. The driving end is connected to the driving mechanism, and the working end abuts against the top end of the locking sleeve. The abutting surfaces between the working end and the locking sleeve are both conical surfaces, and the included angle formed between the two conical surfaces is 90°. A centering space is formed between the first stopper and the two conical surfaces.

[0007] Furthermore, the abutting surfaces between the housing and the locking sleeve are both conical surfaces, and the included angle formed between the two conical surfaces is 90°. A centering space is formed between the second stopper and the two conical surfaces.

[0008] Furthermore, a plurality of through holes distributed circumferentially are provided on the surfaces of the first stopper and the second stopper, and the positions of the through holes correspond to the positions of the first rolling body and the second rolling body.

[0009] Furthermore, a fixing portion is provided on the housing. The fixing portion is located below the locking sleeve, and a plurality of mounting holes are provided on the fixing portion for mounting the part to be measured.

[0010] Furthermore, a limiting assembly is provided between the movable shaft and the housing. The limiting assembly includes a first shaft hole radially penetrating the movable shaft and mating holes on both sides of the housing. A detachable limiting member is provided in the first shaft hole and the mating holes to limit the axial displacement of the movable shaft.

[0011] Furthermore, a clearance fit is provided between the limiting member and the first shaft hole. The movable shaft axially moves within the pore range between the first shaft hole and the limiting member, and an interference fit is provided between the limiting member and the mating hole.

[0012] Furthermore, an orientation assembly is provided between the movable shaft and the locking sleeve. The orientation assembly includes a second shaft hole radially penetrating the movable shaft and an orientation member. The orientation member is installed in the second shaft hole. An interference fit is provided between the orientation member and the second shaft hole, and the orientation member is fixedly connected to both sides of the inner wall of the locking sleeve.

[0013] In a second aspect, the present application also provides a high-precision aperture centering device, including the high-precision aperture centering device as described in the first aspect.

[0014] The above technical solutions provided by the present application have the following advantages compared with the prior art: In the technical solution of the present application, in order to improve the positioning accuracy of the existing aperture centering mechanism, the present application drives the first rolling element to perform an accurate radial displacement along the conical surface of the locking sleeve and the movable shaft through the axial movement of the movable shaft, eliminating the non-linear error caused by the creep and fatigue of the elastic material. At the same time, the first stop member rigidly limits the radial movement range of the first rolling element to prevent overtravel wear or structural failure caused by vibration or external force impact, and extends the service life of the device. Compared with the prior art, the present application replaces the elastic deformation structure of the traditional expansion sleeve with a rigid rolling element, combines the axial drive and the conical surface cooperative control mechanism and the limit protection design, and significantly improves the centering accuracy and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application.

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] One or more embodiments are exemplarily illustrated by the pictures in the corresponding drawings. These exemplary illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements, unless otherwise stated, and the drawings in the drawings do not constitute a proportional limitation.

[0018] Figure 1 It is a structural cross-sectional view of a high-precision aperture centering device provided by an embodiment of the present application; Figure 2 For Figure 1 The partial enlarged schematic view at A in Figure 3 For Figure 1 The structural schematic view when testing the part to be measured in Figure 4 It is a three-dimensional structural schematic view of a high-precision aperture centering device provided by an embodiment of the present application.

[0019] Description of the reference numerals in the drawings: 1. Housing; 11. Movable channel; 12. Fixed part; 121. Mounting hole; 13. Limit assembly; 131. First shaft hole; 132. Matching hole; 133. Limiting member; 14. Orientation assembly; 141. Second shaft hole; 142. Orientation member; 2. Movable shaft; 21. Driving end; 22. Working end; 3. Locking sleeve; 4. First rolling element; 5. First stop member; 51. Through hole; 6. Second rolling element; 7. Second stop member; 8. Part to be measured. Detailed implementation manners

[0020] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are only a part rather than all of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the scope of protection of the present application.

[0021] The following disclosure provides many different embodiments or examples for implementing different structures of the present application. To simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present application. In addition, the present application may repeat reference numerals and / or letters in different examples. This repetition is for the purpose of simplification and clarity and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0022] For ease of description, spatially relative relationship terms may be used in the text to describe the relative positional relationship or movement of one element or feature shown in the figure with respect to another element or feature. These relative relationship terms such as "inner", "outer", "inner side", "outer side", "below", "beneath", "above", "upper", "front", "rear", etc. This spatially relative relationship term is intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure undergoes a position flip or attitude change or motion state change, then these directional indications will change accordingly. For example, an element described as "below" or "beneath" other elements or features will then be oriented as "above" or "over" other elements or features. Therefore, the exemplary term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatially relative relationship descriptors used in the text are interpreted accordingly.

[0023] To solve the technical problem that the existing aperture centering mechanism is difficult to meet the high-precision positioning requirements of the dimensions of existing parking pawl parts, the present application provides a high-precision aperture centering device. By using rigid rolling bodies to replace the elastic deformation structure of the traditional expansion sleeve, combined with the axial drive and conical surface collaborative control mechanism and the limit protection design, the centering accuracy and reliability are significantly improved.

[0024] Please refer to Figures 1 to 4, A high-precision centering device for aperture provided by an embodiment of the present application includes: a housing 1, the housing 1 is hollow along the axis to form a moving channel 11; a moving shaft 2, the moving shaft 2 performs axial movement in the moving channel 11 through a driving mechanism (not shown in the figure); a locking sleeve 3, the locking sleeve 3 is sleeved on the moving shaft 2 and abuts against the top end of the housing 1; a plurality of first rolling elements 4 are arranged circumferentially between the moving shaft 2 and the locking sleeve 3, and a first stopper 5 is arranged on the outer periphery of the first rolling element 4. When the driving mechanism drives the moving shaft 2 to perform axial movement, the first rolling element 4 is affected by the conical surfaces of the locking sleeve 3 and the moving shaft 2, and protected by the first stopper 5, and moves radially along the circumference to achieve centering.

[0025] Specifically, the housing 1 is hollow along the axis to form a through moving channel 11, providing axial movement guidance for the moving shaft 2. The moving shaft 2 performs axial movement in the moving channel 11 of the housing 1 through an external driving mechanism (such as a motor, a hydraulic cylinder or a manual operating rod) to achieve position adjustment. The locking sleeve 3 is located between the housing 1 and the end of the moving shaft 2. The opposite end faces of the moving shaft 2 and the locking sleeve 3 are provided with mutually cooperating conical surfaces. The first rolling elements 4 are evenly distributed in the annular gap formed by the two conical surfaces. When the driving mechanism drives the moving shaft 2 to move downward, the conical surface forces the first rolling element 4 to move radially outward. A circular first stopper 5 is arranged on the outer periphery of the first rolling element 4 to limit the radial displacement range of the first rolling element 4 and prevent excessive expansion or detachment from the working area. In this way, through the circumferential uniform distribution and the cooperative action of the conical surfaces of the first rolling elements 4, the uniformity and synchronism of the radial displacement are achieved, ensuring that the center of the part to be positioned is strictly aligned with the axis of the device, thereby achieving high-precision centering.

[0026] As Figure 1 and Figure 2 shown, a plurality of second rolling elements 6 are also arranged circumferentially at the abutting portion of the locking sleeve 3 and the housing 1. A second stopper 7 is arranged on the outer periphery of the second rolling element 6. When the driving mechanism drives the moving shaft 2 to perform axial movement, the second rolling element 6 is affected by the conical surfaces of the locking sleeve 3 and the housing 1, and protected by the second stopper 7, and moves radially along the circumference to achieve centering.

[0027] Specifically, similar to the first rolling element 4, at the abutting portion of the locking sleeve 3 and the housing 1, a plurality of second rolling elements 6 are evenly distributed along the circumferential direction. The second rolling elements 6 are located in the annular gap formed by the conical surfaces at the bottom end of the locking sleeve 3 and the top end of the housing 1. The abutting surfaces of the locking sleeve 3 and the housing 1 are respectively provided with mutually matching conical surfaces. When the moving shaft 2 is driven to perform axial movement, the locking sleeve 3 moves synchronously with the moving shaft 2, and its conical surface and the conical surface of the housing 1 act together to push the second rolling element 6 to move radially outward. Secondly, a circular second stopper 7 is arranged on the outer periphery of the second rolling element 6 to limit the radial movement range of the second rolling element 6 and prevent it from detaching from the working position.

[0028] Furthermore, in this embodiment, the accuracy is enhanced through double centering. The axial movement of the movable shaft 2 can simultaneously drive the radial displacement of the first rolling elements 4 (between the movable shaft 2 and the locking sleeve 3) and the second rolling elements 6 (between the locking sleeve 3 and the housing 1), forming a two-stage centering effect. Among them, the radial movement of the second rolling elements 6 between the locking sleeve 3 and the housing 1 forms a centering effect complementary to the first rolling elements 4, thereby eliminating the local deviation of a single centering structure, further improving the centering accuracy and symmetry, and ultimately enabling the device to achieve a centering accuracy of the micron level.

[0029] It can be understood that in this embodiment, both the first rolling elements 4 and the second rolling elements 6 are steel balls, and their sizes and volumes are equal. In other embodiments, they can also be all elements such as rollers, needle rollers, and rollers that achieve force transmission or positioning through rolling contact, and can be specifically selected according to actual situations, which are not limited here; the first stop member 5 and the second stop member 7 are respectively fixedly connected (connection methods such as snap, magnetic, and thread) to the upper and lower ends of the locking sleeve 3, and their structures are retaining rings. In other embodiments, they can also be structures such as limit rings and circlips, and can be specifically selected according to actual situations, which are not limited here.

[0030] As Figure 1 shown, the two ends of the movable shaft 2 are respectively a driving end 21 and a working end 22. The driving end 21 is connected to a driving mechanism, and the working end 22 abuts against the top end of the locking sleeve 3. The abutting surfaces of the working end 22 and the locking sleeve 3 are both conical surfaces, and the included angle formed between the two conical surfaces is 90°. The first stop member 5 and the two conical surfaces form a centering space.

[0031] Specifically, the driving end 21 of the movable shaft 2 is connected to an external driving mechanism (such as a motor push rod or a hydraulic cylinder), and the working end 22 directly abuts against the top end of the locking sleeve 3. Among them, the working end 22 is a conical boss, whose outer diameter is equal to the outer diameter of the locking sleeve 3, and the inner diameter is larger than the inner diameter of the locking sleeve 3, thereby preventing the movable shaft 2 from detaching from the locking sleeve 3 and the housing 1 during the driving process. The abutting surfaces of the working end 22 and the locking sleeve 3 are both conical surfaces, and the extending directions of the two conical surfaces form a 90° included angle, constituting a symmetric V-shaped guiding structure. The gap between the first stop member 5 and the two conical surfaces together encloses a centering space for restricting the radial movement trajectory of the first rolling elements 4. The split design of the driving end 21 and the working end 22 combined with the 90° conical surface included angle uniformly converts the axial driving force into a radial expansion force, improving the response speed and synchronism of the centering action. At the same time, the symmetric V-shaped conical surface cooperation ensures that the axes of the movable shaft 2 and the locking sleeve 3 always coincide, eliminating the eccentric error caused by assembly deviation and improving the coaxiality of the centering device.

[0032] As Figure 1 shown, the abutting surfaces of the housing 1 and the locking sleeve 3 are both conical surfaces, and the included angle formed between the two conical surfaces is 90°. The second stop member 7 and the two conical surfaces form a centering space.

[0033] As Figure 1 , Figure 3 and Figure 4 shown, a plurality of through holes 51 distributed circumferentially are provided on the surfaces of the first stopper 5 and the second stopper 7, and the positions of the through holes 51 correspond to the positions of the first rolling element 4 and the second rolling element 6.

[0034] Specifically, the axis of the through hole 51 in this embodiment coincides with the central axis of the rolling element, ensuring that the movement trajectory of the rolling element matches the spatial position of the through hole 51. The through hole 51 provides an avoidance space for the radial movement of the rolling element, avoiding friction or jamming at the contact surface between the stopper body and the rolling element. Secondly, the corresponding relationship between the through hole 51 and the rolling element provides a positioning reference for the rolling element with visual or tool assistance, simplifying the assembly process and reducing human error.

[0035] As Figures 3 to 4 shown, a fixing portion 12 is provided on the housing 1. The fixing portion 12 is located below the locking sleeve 3, and a plurality of mounting holes 121 are provided on the fixing portion 12 for mounting the part to be tested 8.

[0036] Specifically, the fixing portion 12 is a disc-shaped structure provided around the outside of the housing 1. It is located directly below the locking sleeve 3 and maintains an axial interval from the locking sleeve 3 to form an independent mounting area. A plurality of mounting holes 121 are evenly distributed along the circumferential or symmetric direction on the fixing portion 12. The mounting holes 121 penetrate through the fixing portion 12, and the hole diameter matches the connection structure (such as bolts, buckles) of the part to be tested 8. The fixing portion 12 is integrally formed with the housing 1 (such as by casting or machining) or fixed to the housing 1 by welding / bolts to form a rigid support platform. Through the circumferential / symmetric layout of the multiple mounting holes 121, this device can adapt to parts to be tested 8 with different sizes or interface positions, realizing rapid replacement and compatibility expansion.

[0037] As Figure 1 shown, a limiting component 13 is provided between the movable shaft 2 and the housing 1. The limiting component 13 includes a first shaft hole 131 radially penetrating through the movable shaft 2 and mating holes 132 on both sides of the housing 1. A detachable limiting member 133 is provided in the first shaft hole 131 and the mating holes 132 to limit the axial displacement of the movable shaft 2.

[0038] Specifically, coaxial mating holes 132 are provided at corresponding positions on both sides of the housing 1. The axes of the first shaft hole 131 and the mating hole 132 are perpendicular to the axial movement direction of the movable shaft 2. The limiting member 133 is a detachable pin or bolt, which is inserted into the first shaft hole 131 and the mating holes 132 on both sides. The axial limit of the movable shaft 2 is achieved by matching the diameter of the limiting member 133 with the hole clearance, thereby adjusting the maximum stroke range of the movable shaft 2. In this way, through the mechanical block of the rigid limiting member 133, the axial movement limit of the movable shaft 2 is directly restricted, avoiding the risk of over-travel caused by the failure of the driving mechanism.

[0039] As Figure 1 shown, there is a clearance fit between the limiting member 133 and the first shaft hole 131. The movable shaft 2 axially moves within the pore range between the first shaft hole 131 and the limiting member 133, and there is an interference fit between the limiting member 133 and the mating hole 132.

[0040] Specifically, a clearance fit is adopted between the limiting member 133 and the first shaft hole 131 of the movable shaft 2, allowing a small pore to be reserved between the limiting member 133 and the inner wall of the first shaft hole 131, so that the movable shaft 2 can freely axially move within the pore range. An interference fit is adopted between the limiting member 133 and the mating holes 132 on both sides of the housing 1 to ensure that the limiting member 133 is fixed in the housing 1 without loosening, and only a relative displacement is generated between the limiting member 133 and the movable shaft 2 through the axial movement of the movable shaft 2. The axial movement range of the movable shaft 2 is determined by the clearance length between the limiting member 133 and the first shaft hole 131. The limiting member 133 is fixed on the housing 1 through an interference fit to form a rigid blocking boundary.

[0041] As Figure 1 shown, a guiding assembly 14 is provided between the movable shaft 2 and the locking sleeve 3. The guiding assembly 14 includes a second shaft hole 141 radially penetrating the movable shaft 2 and a guiding member 142. The guiding member 142 is installed in the second shaft hole 141, and there is an interference fit between the guiding member 142 and the second shaft hole 141. The two sides of the inner wall of the guiding member 142 are fixedly connected to the locking sleeve 3.

[0042] Specifically, the guiding member 142 (such as a cylindrical pin or a key bar) is press-fitted into the second shaft hole 141 through an interference fit to form a rigid connection between the movable shaft 2 and the guiding member 142. The two ends of the guiding member 142 extend to both sides of the inner wall of the locking sleeve 3 and are fixed by welding, riveting or bolts, so as to form a non-rotatable linkage structure between the movable shaft 2 and the locking sleeve 3. The outer diameter of the guiding member 142 is slightly larger than the inner diameter of the second shaft hole 141, and is forcibly assembled through a cold pressing or hot fitting process to eliminate the clearance between the movable shaft 2 and the guiding member 142.

[0043] In some other embodiments, the embodiment of the present application also provides a high-precision centering device for hole diameters, including the high-precision centering device for hole diameters as in the first aspect.

[0044] Specifically, the high-precision aperture centering equipment uses the high-precision aperture centering device of the first aspect as a core component, and the centering device is fixed to the base or frame of the equipment by bolts, welding or clamping to form a complete functional device. The device can integrate an external drive module (such as a motor, a hydraulic station), a control unit (such as a PLC or a sensor) and a human-machine interaction interface (such as an operation panel), and work with the centering device to realize automated centering operation. By integrating the centering device into the equipment as an independent module, the complete encapsulation of the centering function can be achieved, which is convenient for direct application in production lines or inspection scenarios. At the same time, the equipment design standardizes the operating procedures of the centering device, reduces the need for manual intervention, and improves work efficiency and consistency.

[0045] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0046] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0047] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0048] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be connected, detachably connected, or integrated; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0049] In this application, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may include direct contact between the first and second features, or may include indirect contact between the first and second features through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than that of the second feature.

[0050] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic representations of the above terms should not be understood as necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0051] Obviously, those skilled in the art can make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalent technologies, this application is also intended to include these changes and modifications.

[0052] The above is the specific implementation manner of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art within the technical scope disclosed by this application can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should all be covered by the protection scope of this application. Therefore, the protection scope of this application shall be subject to the protection scope of the claims.

Claims

1. An aperture high-precision centering device, characterized in that Comprising: A housing, which is hollow along an axis to form a movable channel; A movable shaft, which axially moves within the movable channel through a driving mechanism; A locking sleeve, which is sleeved on the movable shaft and abuts against the top end of the housing; A number of first rolling bodies are arranged circumferentially between the movable shaft and the locking sleeve. A first stop is provided on the outer periphery of the first rolling body. When the driving mechanism drives the movable shaft to axially move, the first rolling body moves radially along the circumference under the action of the conical surfaces of the locking sleeve and the movable shaft and the protection of the first stop to achieve centering.

2. The aperture high-precision centering device according to claim 1, wherein A number of second rolling bodies are also arranged circumferentially at the abutting portion between the locking sleeve and the housing. A second stop is provided on the outer periphery of the second rolling body. When the driving mechanism drives the movable shaft to axially move, the second rolling body moves radially along the circumference under the action of the conical surfaces of the locking sleeve and the housing and the protection of the second stop to achieve centering.

3. The aperture high-precision centering device according to claim 2, characterized in that Both ends of the movable shaft are a driving end and a working end respectively. The driving end is connected to the driving mechanism, and the working end abuts against the top end of the locking sleeve. The abutting surfaces between the working end and the locking sleeve are both conical surfaces, and the included angle formed between the two conical surfaces is 90°. A centering space is formed between the first stop and the two conical surfaces.

4. The aperture high-precision centering device according to claim 3, characterized in that, The abutting surfaces between the housing and the locking sleeve are both conical surfaces, and the included angle formed between the two conical surfaces is 90°. A centering space is formed between the second stop and the two conical surfaces.

5. The aperture high-precision centering device according to claim 4, characterized in that, A number of through holes are arranged circumferentially on the surfaces of the first stop and the second stop, and the positions of the through holes correspond to the positions of the first rolling body and the second rolling body.

6. The aperture high-precision centering device according to claim 1, characterized in that A fixing portion is provided on the housing, which is located below the locking sleeve. A number of mounting holes are provided on the fixing portion for mounting a part to be measured.

7. The aperture high-precision centering device according to claim 1, characterized in that A limiting assembly is provided between the movable shaft and the housing. The limiting assembly includes a first shaft hole radially penetrating the movable shaft and mating holes on both sides of the housing. A detachable limiting member is provided in the first shaft hole and the mating holes to limit the axial displacement of the movable shaft.

8. The aperture high-precision centering device according to claim 7, wherein A clearance fit is provided between the limiting member and the first shaft hole, and the movable shaft axially moves within the pore range between the first shaft hole and the limiting member. An interference fit is provided between the limiting member and the mating hole.

9. The aperture high-precision centering device according to claim 1, characterized in that, An orientation assembly is provided between the movable shaft and the locking sleeve. The orientation assembly includes a second shaft hole radially penetrating the movable shaft and an orientation member. The orientation member is installed in the second shaft hole. An interference fit is provided between the orientation member and the second shaft hole, and the orientation member is fixedly connected to both sides of the inner wall of the locking sleeve.

10. An aperture high-precision centering device, characterized in that, Including the aperture high-precision centering device according to any one of the above claims 1-9.

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