Precise shaft system adopting three-point contact positioning structure

Abstract

The invention belongs to the technical field of precise shaft systems, and discloses a precise shaft system adopting a three-point contact positioning structure, which comprises a main shaft, the three-point contact positioning structure and a self-aligning structure, the main shaft is provided with an upper spherical rotor structure and a lower spherical rotor structure; the upper spherical rotor structure is connected with the three-point contact positioning structure; the lower spherical rotor structure is connected with the aligning structure; the three-point contact positioning structure is used for performing three-point contact with the upper spherical rotor structure in the circumferential direction so as to position the upper spherical rotor structure; the aligning structure is used for aligning the lower spherical rotor structure so as to realize the centering of the main shaft; according to the precise shafting adopting the three-point contact positioning structure, the three-point contact positioning structure and the aligning structure can support the main shaft under the conditions of small size and high precision, so that the manufacturing difficulty and the mounting difficulty of the precise shafting are effectively reduced, and the precision of the precise shafting is improved.

Description

Technical Field

[0001] The present application relates to the technical field of precision shafting, and in particular to a precision shafting using a three-point contact positioning structure. Background Art

[0002] The mechanical accuracy of small precision shaft systems using traditional bearings mainly depends on the following aspects: bearing accuracy, shaft manufacturing accuracy, support structure accuracy and installation accuracy. This affects the accuracy of small precision shaft systems using traditional bearings in many ways, and places extremely high demands on the mechanical accuracy of each component and the assembly accuracy of the system.

[0003] Therefore, in order to solve the technical problem that the accuracy of small precision shaft systems of traditional bearings has extremely high requirements on the mechanical accuracy and assembly accuracy of each component, a precision shaft system with a three-point contact positioning structure is urgently needed. Summary of the invention

[0004] The purpose of the present application is to provide a precision shaft system adopting a three-point contact positioning structure, by which an upper spherical mover structure is positioned and a lower spherical mover structure is aligned through a self-aligning structure, thereby ensuring the accuracy of the precision shaft system adopting the three-point contact positioning structure, and solving the problem that the accuracy of small precision shaft systems of traditional bearings has extremely high requirements on the mechanical accuracy and assembly accuracy of each component. Through the three-point contact positioning structure and the self-aligning structure, the main shaft can be supported in a smaller volume and with higher accuracy, thereby effectively reducing the manufacturing difficulty and installation difficulty of the precision shaft system and improving the accuracy of the precision shaft system.

[0005] In a first aspect, the present application provides a precision shaft system adopting a three-point contact positioning structure, comprising a main shaft, a three-point contact positioning structure and a centering structure; the main shaft is provided with an upper spherical mover structure and a lower spherical mover structure; the upper spherical mover structure is connected to the three-point contact positioning structure; the lower spherical mover structure is connected to the centering structure; The three-point contact positioning structure is used to position the upper spherical mover structure by making three-point contact with the upper spherical mover structure along the circumferential direction; The centering structure is used to center the lower spherical mover structure to achieve centering of the main shaft.

[0006] The precision shaft system with a three-point contact positioning structure provided in the present application can improve the accuracy of the precision shaft system. The upper spherical mover structure is positioned by the three-point contact positioning structure, and the lower spherical mover structure is aligned by the self-aligning structure, thereby ensuring the accuracy of the precision shaft system with a three-point contact positioning structure, and solving the problem that the accuracy of small precision shaft systems of traditional bearings has extremely high requirements on the mechanical accuracy and assembly accuracy of each component. The three-point contact positioning structure and the self-aligning structure can support the main shaft in a smaller volume and with higher accuracy, effectively reducing the manufacturing difficulty and installation difficulty of the precision shaft system, and improving the accuracy of the precision shaft system.

[0007] Optionally, the three-point contact positioning structure is arranged on the outer surface of the upper spherical mover structure to surround the upper spherical mover structure.

[0008] Optionally, the portion of the upper spherical mover structure surrounded by the three-point contact positioning structure is provided with an equilateral triangle positioning hole; the three-point contact positioning structure abuts against the upper spherical mover structure through three sides of the equilateral triangle positioning hole to position the upper spherical mover structure.

[0009] The precision shaft system using a three-point contact positioning structure provided in the present application can improve the accuracy of the precision shaft system. The inner circumference of the three-point contact positioning structure is set as an equilateral triangle positioning hole, and the three sides of the equilateral triangle positioning hole are abutted against the upper spherical mover structure to position the upper spherical mover structure, thereby improving the accuracy of the precision shaft system using a three-point contact positioning structure.

[0010] Optionally, the portion of the three-point contact positioning structure surrounding the upper spherical mover structure is provided with a circular positioning hole, and the inner circumferential surface of the circular positioning hole is evenly provided with three convex keys; the three-point contact positioning structure abuts against the upper spherical mover structure through the three convex keys to position the upper spherical mover structure.

[0011] The precision shaft system using a three-point contact positioning structure provided in the present application can improve the accuracy of the precision shaft system by setting the inner circumference of the three-point contact positioning structure as a circular positioning hole, and abutting the upper spherical mover structure with three convex keys evenly set on the inner circumference of the circular positioning hole to position the upper spherical mover structure, thereby improving the accuracy of the precision shaft system using a three-point contact positioning structure.

[0012] Optionally, a three-point contact positioning structure bracket is provided outside the three-point contact positioning structure; The three-point contact positioning structure bracket is used to fix the position of the three-point contact positioning structure.

[0013] Optionally, a shaft sleeve is disposed outside the main shaft; The shaft sleeve is used to fix the position of the main shaft.

[0014] Optionally, the centering structure includes a spherical groove positioning slider and a voice coil motor; a plurality of voice coil motors are provided, and are evenly arranged along the circumference of the lower spherical mover structure; The lower spherical mover structure is connected to the spherical groove positioning slider, and the voice coil motor is used to adjust the position of the spherical groove positioning slider to achieve the centering of the main shaft.

[0015] Optionally, the centering structure further includes a spring; the number of the springs is equal to the number of the voice coil motors, the springs and the voice coil motors are arranged one by one on opposite sides of the main shaft, and are evenly arranged along the circumference of the lower spherical mover structure; The spring is used to assist the spherical groove positioning slider and the voice coil motor in centering.

[0016] Optionally, the centering structure further includes a centering structure support; The centering structure bracket is used to fix the centering structure.

[0017] Optionally, the spherical groove positioning slider is provided with a spherical groove; the lower spherical mover structure extends into the spherical groove and abuts against the groove surface of the spherical groove; The spherical groove is used to align the lower spherical mover structure.

[0018] Beneficial effect: The precision shaft system with a three-point contact positioning structure provided in the present application positions the upper spherical mover structure through the three-point contact positioning structure, and aligns the lower spherical mover structure through the self-aligning structure, thereby ensuring the accuracy of the precision shaft system with a three-point contact positioning structure, and solving the problem that the accuracy of small precision shaft systems of traditional bearings has extremely high requirements on the mechanical accuracy and assembly accuracy of each component. The three-point contact positioning structure and the self-aligning structure can support the main shaft in a smaller volume and with higher accuracy, effectively reducing the manufacturing difficulty and installation difficulty of the precision shaft system, and improving the accuracy of the precision shaft system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic structural diagram of a precision shaft system using a three-point contact positioning structure provided in an embodiment of the present application.

[0020] Figure 2 A structural schematic diagram of a three-point contact positioning structure provided in an embodiment of the present application.

[0021] Figure 3 A schematic structural diagram of another three-point contact positioning structure provided in an embodiment of the present application.

[0022] Figure 4 A schematic structural diagram of a spherical groove positioning slider provided in an embodiment of the present application.

[0023] Explanation of reference numerals: 1. Spindle; 2. Three-point contact positioning structure; 3. Self-aligning structure; 4. Upper spherical mover structure; 5. Lower spherical mover structure; 6. Three-point contact positioning structure bracket; 7. Bushing; 8. Spherical groove positioning slider; 9. Voice coil motor; 10. Self-aligning structure bracket. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0025] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0026] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 , Figure 1 It is a precision shaft system using a three-point contact positioning structure in some embodiments of the present application, including a main shaft 1, a three-point contact positioning structure 2 and a centering structure 3; the main shaft 1 is provided with an upper spherical mover structure 4 and a lower spherical mover structure 5; the upper spherical mover structure 4 is connected to the three-point contact positioning structure 2; the lower spherical mover structure 5 is connected to the centering structure 3; The three-point contact positioning structure 2 is used to position the upper spherical mover structure 4 by making three-point contact with the upper spherical mover structure 4 along the circumferential direction; The centering structure 3 is used to center the lower spherical mover structure 5 to achieve centering of the main shaft 1 .

[0027] In specific applications, the combination of the three-point contact positioning structure 2 and the self-aligning structure 3 effectively solves the problem that the accuracy of small precision shaft systems of traditional bearings is affected by many factors. The upper spherical mover structure 4 is precisely positioned by the three-point contact positioning structure 2 to ensure the accuracy of the upper spherical mover structure. The lower spherical mover structure 5 is self-aligned by the self-aligning structure 3 to achieve the centering of the main shaft 1. This structural design not only improves the mechanical accuracy of the precision shaft system, but also simplifies the assembly process of the precision shaft system, reducing the requirements for the mechanical accuracy of each component and the system assembly accuracy.

[0028] The precision shaft system adopting the three-point contact positioning structure positions the upper spherical mover structure by the three-point contact positioning structure, and aligns the lower spherical mover structure by the self-aligning structure, thereby ensuring the accuracy of the precision shaft system adopting the three-point contact positioning structure, and solving the problem that the accuracy of the small precision shaft system of traditional bearings has extremely high requirements on the mechanical accuracy and assembly accuracy of each component. The three-point contact positioning structure and the self-aligning structure can realize the support function of the main shaft in a smaller volume and with higher accuracy, effectively reducing the manufacturing difficulty and installation difficulty of the precision shaft system, and improving the accuracy of the precision shaft system.

[0029] Specifically, the three-point contact positioning structure 2 is arranged on the outer surface of the upper spherical mover structure 4 to surround the upper spherical mover structure 4 .

[0030] In specific applications, the three-point contact positioning structure 2 forms a stable positioning environment by surrounding the outer surface of the upper spherical mover structure 4 to ensure the accuracy of the upper spherical mover structure 4. This design enhances the stability and accuracy of positioning through physical contact and surrounding.

[0031] Specifically, in some optional embodiments, the portion of the three-point contact positioning structure 2 surrounding the upper spherical mover structure 4 is provided with an equilateral triangle positioning hole; the three-point contact positioning structure 2 abuts against the upper spherical mover structure 4 through the three sides of the equilateral triangle positioning hole to position the upper spherical mover structure 4.

[0032] In a specific application, the three-point contact positioning structure 2 surrounds the upper spherical mover structure 4 and forms an equilateral triangle positioning hole (such as Figure 2As shown), the three sides of the equilateral triangle positioning hole are used to abut against the upper spherical mover structure 4 to form a three-point contact. Based on the idea that three points determine a plane, the intersection position of the axis of the main shaft 1 and the plane established by the three-point contact of the equilateral triangle positioning hole in the three-point contact positioning structure 2 is determined, thereby realizing the precise positioning of the upper spherical mover structure 4. The three-point contact positioning structure 2 is used as the stator, and the upper spherical mover structure 4 is used as the rotor, so as to realize the positioning of the stator to the rotor. At the same time, since there is no installation gap between the three-point contact positioning structure 2 and the upper spherical mover structure 4, the main shaft 1 can maintain extremely high positioning accuracy, and since the contact surface between the three-point contact positioning structure 2 and the upper spherical mover structure 4 is small, its wear and heat generation is also small, making the precision shaft system using the three-point contact positioning structure 2 more reliable.

[0033] Among them, the three sides of the equilateral triangle positioning hole can be made of high-strength alloy material to ensure the stability and durability of the three-point contact positioning structure 2.

[0034] Specifically, in other optional embodiments, the portion of the three-point contact positioning structure 2 surrounding the upper spherical mover structure 4 is provided with a circular positioning hole, and the inner circumferential surface of the circular positioning hole is evenly provided with three convex keys; the three-point contact positioning structure 2 abuts against the upper spherical mover structure 4 through the three convex keys to position the upper spherical mover structure 4.

[0035] In specific applications, a circular positioning hole is provided in the portion of the three-point contact positioning structure 2 surrounding the upper spherical mover structure 4, and three convex keys are evenly provided on the inner circumference of the circular positioning hole. These convex keys abut against the upper spherical mover structure 4, thereby realizing precise positioning of the upper spherical mover structure 4. The setting of the three convex keys can ensure the stability and accuracy of the upper spherical mover structure 4 during the positioning process.

[0036] The key can be made of hard material to improve wear resistance and service life. In addition, the shape and size of the key can be adjusted according to actual application requirements. For example, it can be designed as a cylindrical, rectangular (such as Figure 3 Rectangular (shown) or other geometric shapes to accommodate different positioning needs.

[0037] Specifically, a three-point contact positioning structure bracket 6 is arranged outside the three-point contact positioning structure 2; The three-point contact positioning structure bracket 6 is used to fix the position of the three-point contact positioning structure 2 .

[0038] In specific applications, the three-point contact positioning structure bracket 6 is provided to ensure the stability and accuracy of the three-point contact positioning structure 2 in the precision shaft system. The three-point contact positioning structure bracket 6 fixes the position of the three-point contact positioning structure 2 by mechanical fixing methods such as inlaying and bolts, which can effectively prevent displacement or offset during operation, thereby ensuring the positioning accuracy of the upper spherical mover structure 4.

[0039] Specifically, a sleeve 7 is disposed outside the main shaft 1; The shaft sleeve 7 is used to fix the position of the main shaft 1.

[0040] In specific applications, the shaft sleeve 7 can fix the main shaft 1 in various ways. For example, the shaft sleeve 7 can fix the main shaft 1 inside it by fastening bolts, or the main shaft 1 can be tightly embedded in the shaft sleeve 7 by press fitting.

[0041] The sleeve 7 is not only used to fix the position of the main shaft 1, but also can reduce the wear and friction between the main shaft 1 and the bearing seat.

[0042] In some optional embodiments, the inner wall of the sleeve 7 may be provided with a groove, and the outer surface of the main shaft 1 may be provided with a corresponding protrusion, and the main shaft 1 may be fixed by the cooperation between the groove and the protrusion. Furthermore, a bracket may be provided on the outside of the sleeve 7 to further enhance the fixing effect of the sleeve 7.

[0043] Specifically, the centering structure 3 includes a spherical groove positioning slider 8 and a voice coil motor 9; a plurality of voice coil motors 9 are provided, and are evenly arranged along the circumference of the lower spherical mover structure 5; The lower spherical mover structure 5 is connected to the spherical groove positioning slider 8 , and the voice coil motor 9 is used to adjust the position of the spherical groove positioning slider 8 to achieve centering of the main shaft 1 .

[0044] In a specific application, the voice coil motor 9 is evenly distributed around the lower spherical mover structure 5. The position of the spherical groove positioning slider 8 is adjusted by the thrust output by the voice coil motor 9 to drive the spherical groove positioning slider 8 to align the lower spherical mover structure 5, and record the current value during the alignment. After the alignment is completed, the actual current of the voice coil motor 9 is monitored in real time according to this current value, and real-time feedback adjustment is performed to achieve dynamic alignment. The voice coil motor 9 can accurately adjust the position of the lower spherical mover structure 5, thereby achieving dynamic alignment of the spindle 1 and ensuring the centering of the spindle 1. Among them, the relatively arranged voice coil motors 9 are arranged in pairs to achieve bidirectional sliding of the spherical groove positioning slider 8.

[0045] Specifically, in some other optional embodiments, the centering structure 3 further includes a spring; the number of the springs and the voice coil motors 9 is equal, and the springs and the voice coil motors 9 are arranged one by one on opposite sides of the main shaft 1 and are evenly arranged along the circumference of the lower spherical mover structure 5; The spring is used to assist the spherical groove positioning slider 8 and the voice coil motor 9 in aligning.

[0046] In a specific application, half of the voice coil motors 9 are replaced by springs to reduce costs, wherein the springs and the voice coil motors 9 in relative positions form an adjustment group. By acquiring the actual current of the voice coil motors 9 in the adjustment group and performing real-time feedback based on the current value during alignment, the spherical groove positioning slider 8 can be driven to slide in both directions to achieve dynamic alignment of the spindle 1.

[0047] Specifically, the centering structure 3 further includes a centering structure bracket 10; The centering structure bracket 10 is used to fix the centering structure 3 .

[0048] In specific applications, the arrangement of the self-aligning structure bracket 10 is to ensure the stability and accuracy of the self-aligning structure 3 in the precision shaft system. The self-aligning structure bracket 10 fixes the position of the self-aligning structure by mechanical fixing methods such as inlaying and bolts, which can effectively prevent displacement or offset during operation, thereby ensuring the positioning accuracy of the lower spherical mover structure 5.

[0049] Specifically, the spherical groove positioning slider 8 is provided with a spherical groove; the lower spherical mover structure 5 extends into the spherical groove and abuts against the groove surface of the spherical groove; The spherical groove is used to align the lower spherical mover structure 5 .

[0050] In specific applications, such as Figure 4 As shown, the spherical groove positioning slider 8 is provided with a spherical groove, the shape of which is adapted to the lower spherical mover structure 5, the lower spherical mover structure 5 extends into the spherical groove and abuts against the groove surface of the spherical groove, and the spherical groove is used to provide a precise centering surface for the lower spherical mover structure 5, and the design of this spherical groove enables the lower spherical mover structure 5 to remain stable during the centering process, thereby realizing the centering of the spindle 1. Among them, the shape of the spherical groove is a spherical surface, and its surface precision is required to be high to ensure the accuracy of the centering, and the size and position of the spherical groove need to be precisely designed according to the specific size and centering requirements of the lower spherical mover structure 5.

[0051] From the above, it can be seen that the precision shaft system adopting the three-point contact positioning structure positions the upper spherical mover structure through the three-point contact positioning structure, and aligns the lower spherical mover structure through the self-aligning structure, thereby ensuring the accuracy of the precision shaft system adopting the three-point contact positioning structure, and solving the problem that the accuracy of the small precision shaft system of traditional bearings has extremely high requirements on the mechanical accuracy and assembly accuracy of each component. The three-point contact positioning structure and the self-aligning structure can realize the support function of the main shaft in a smaller volume and with higher accuracy, effectively reducing the manufacturing difficulty and installation difficulty of the precision shaft system, and improving the accuracy of the precision shaft system.

[0052] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, and the indirect coupling or communication connection of the devices or units can be electrical, mechanical or other forms.

[0053] In addition, the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, and may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0054] Furthermore, the functional modules in the various embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.

[0055] In this document, relational terms such as first and second, etc. are used merely to distinguish one entity or operation from another entity or operation, but do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0056] The above description is only an embodiment of the present application and is not intended to limit the protection scope of the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A precision shaft system using a three-point contact positioning structure, characterized in that: The invention comprises a main shaft (1), a three-point contact positioning structure (2) and a centering structure (3); the main shaft (1) is provided with an upper spherical mover structure (4) and a lower spherical mover structure (5); the upper spherical mover structure (4) is connected to the three-point contact positioning structure (2); the lower spherical mover structure (5) is connected to the centering structure (3); The three-point contact positioning structure (2) is used to position the upper spherical mover structure (4) by making three-point contact with the upper spherical mover structure (4) along the circumferential direction; The centering structure (3) is used to center the lower spherical mover structure (5) to achieve centering of the main shaft (1).

2. The precision shaft system with three-point contact positioning structure according to claim 1 is characterized in that: The three-point contact positioning structure (2) is arranged on the outer surface of the upper spherical mover structure (4) to surround the upper spherical mover structure (4).

3. The precision shaft system with three-point contact positioning structure according to claim 2 is characterized in that: An equilateral triangle positioning hole is provided in the portion of the three-point contact positioning structure (2) surrounding the upper spherical mover structure (4); the three-point contact positioning structure (2) abuts against the upper spherical mover structure (4) through the three sides of the equilateral triangle positioning hole to position the upper spherical mover structure (4).

4. The precision shaft system with three-point contact positioning structure according to claim 2 is characterized in that: The portion of the three-point contact positioning structure (2) surrounding the upper spherical mover structure (4) is provided with a circular positioning hole, and the inner circumferential surface of the circular positioning hole is evenly provided with three convex keys; the three-point contact positioning structure (2) abuts against the upper spherical mover structure (4) via the three convex keys to position the upper spherical mover structure (4).

5. The precision shaft system with three-point contact positioning structure according to claim 2 is characterized in that: A three-point contact positioning structure bracket (6) is arranged outside the three-point contact positioning structure (2); The three-point contact positioning structure bracket (6) is used to fix the position of the three-point contact positioning structure (2).

6. The precision shaft system with three-point contact positioning structure according to claim 5 is characterized in that: A shaft sleeve (7) is arranged outside the main shaft (1); The shaft sleeve (7) is used to fix the position of the main shaft (1).

7. The precision shaft system with three-point contact positioning structure according to claim 6 is characterized in that: The centering structure (3) comprises a spherical groove positioning slider (8) and a voice coil motor (9); a plurality of voice coil motors (9) are provided, and are evenly arranged along the circumference of the lower spherical mover structure (5); The lower spherical mover structure (5) is connected to the spherical groove positioning slider (8), and the voice coil motor (9) is used to adjust the position of the spherical groove positioning slider (8) to achieve centering of the main shaft (1).

8. The precision shaft system with three-point contact positioning structure according to claim 7 is characterized in that: The centering structure (3) further comprises a spring; the number of the springs and the voice coil motors (9) is equal, the springs and the voice coil motors (9) are arranged one by one on opposite sides of the main shaft (1), and are evenly arranged along the circumference of the lower spherical mover structure (5); The spring is used to assist the spherical groove positioning slider (8) and the voice coil motor (9) in aligning the centers.

9. The precision shaft system with three-point contact positioning structure according to claim 7 or 8, characterized in that: The centering structure (3) further comprises a centering structure support (10); The centering structure bracket (10) is used to fix the centering structure (3).

10. The precision shaft system with three-point contact positioning structure according to claim 9, characterized in that: The spherical groove positioning slide block (8) is provided with a spherical groove; the lower spherical mover structure (5) extends into the spherical groove and abuts against the groove surface of the spherical groove; The spherical groove is used to align the lower spherical mover structure (5).

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