End face multi-zone pressure regulating precision nut

Abstract

A kind of end face multi-zone pressure regulating precision nut, including nut body, the one end of the nut body is equipped with first flange, the other end of the nut body is equipped with second flange, the outer end of the second flange is equipped with third flange;The end face of the second flange towards the third flange is equipped with the second boss that protrudes, the end face of the third flange towards the second flange is equipped with the third boss that protrudes, the second boss and the third boss are in contact;Second boss and third boss are all equipped with inclined surface, which makes the junction position of second boss and third boss have circumferential inner recess;It further includes pressure regulating assembly, the pressure regulating assembly includes several pressure blocks and force applying member matched with the pressure block.The present application provides a kind of end face multi-zone pressure regulating precision nut, can realize the independent adjustment of end face multi-zone after tightening, and the sensitivity of this adjustment is high.

Description

Technical Field

[0001] This invention belongs to the field of fasteners, specifically relating to a precision nut with multi-zone pressure adjustment on the end face. Background Technology

[0002] A nut is a common fastener, typically made of metal and hexagonal or cylindrical in shape. Its main function is to be used in conjunction with a screw, where the threads interlock to secure the fastener in a mechanical assembly.

[0003] Precision nuts are mainly used in the adjustment of the last 0.002mm runout of precision machine tools, precision instruments, and precision components. The accuracy of structural components adjusted by using this precision nut is greatly improved. During the tightening process of the precision nut, the end face pressure may be unevenly distributed. This is mainly caused by the following factors: (1) Elastic properties of the material: The material of the nut has a certain elasticity. When the nut is tightened, the material will undergo elastic deformation. Due to the different initial stress and deformation degree in different areas, the end face pressure is unevenly distributed. (2) Influence of friction: During the tightening process of the nut, there is friction between the thread and the nut. Due to the different local friction coefficients or uneven lubrication, the end face pressure distribution will be uneven. (3) Assembly error: Before the nut is tightened, there may be assembly errors between it and the connected parts, such as gaps or non-parallelism. These errors will be eliminated or transformed into uneven end face pressure during the tightening process.

[0004] To address the problem of uneven end-face pressure, the following measures can be taken: (1) Select appropriate tightening tools: Using tools such as torque wrenches and hydraulic wrenches can control the tightening torque and reduce uneven distribution of end-face pressure. (2) Tighten evenly: Tighten the nuts gradually and evenly, avoiding one side being too tight or too loose. (3) Control the use of lubricant: Use an appropriate amount of lubricant to ensure even lubrication and reduce the impact of friction. (4) Check assembly errors: Before tightening, check the connected parts and make necessary adjustments or corrections to reduce the impact of assembly errors on the distribution of end-face pressure.

[0005] The above measures effectively reduce the uneven distribution of end-face pressure during nut tightening. However, in precision machine tools, precision instruments, and precision components, these measures are often insufficient, especially in adjusting the final 0.002mm runout. Even with sufficiently high precision in the nut and mating parts, the previous measures, while ensuring completely uniform end-face pressure, cannot effectively guarantee the 0.002mm runout requirement. This is mainly because the nut end-face pressure can only be adjusted overall, and uniformity is determined by the overall error. We propose whether there is a nut that allows for multi-regional pressure adjustment after tightening. This would allow us to adjust the pressure in different regions based on actual test results, effectively meeting high-precision requirements. This application has conducted research in this direction. Summary of the Invention

[0006] To address the shortcomings of the existing technology, this invention provides a precision nut for adjusting pressure in multiple areas of the end face. After tightening, it enables independent adjustment of pressure in multiple areas of the end face. This adjustment is highly sensitive and plays an important role in adjusting the final 0.002mm runout of precision machine tools, precision instruments, and precision components.

[0007] The present invention is solved by the following technical solution.

[0008] A precision nut with multi-zone pressure adjustment on its end face includes a nut body, a first flange at one end of the nut body, a second flange at the other end of the nut body, and a third flange at the outer end of the second flange. The nut body, the first flange, the second flange, and the third flange are all cylindrical structures with a central hole. The nut body, the first flange, the second flange, and the third flange are connected in series by several through-type connecting rods. One end of each connecting rod is fixedly connected to the first flange, and the other end of each connecting rod is fixedly connected to the third flange. There is a clearance fit between the nut body and the connecting rods, and also a clearance fit between the second flange and the connecting rods. The second flange faces the third flange. The flange has a protruding second boss on its end face, and the third flange has a protruding third boss on its end face facing the second flange, with the second boss and the third boss abutting against each other; both the second boss and the third boss have inclined surfaces, which create a circumferential concave cavity at the junction of the second boss and the third boss; the flange also includes a pressure regulating assembly, which includes several pressure blocks and a force-applying element matching the pressure blocks. The pressure blocks are disposed in the concave cavity, and the pressure blocks have surfaces that abut against the inclined surfaces on the second boss and the third boss; the force of the force-applying element acts on the pressure blocks and compresses the inclined surfaces, causing a slight change in the position of the second flange.

[0009] The multi-zone pressure-adjustable precision nut of this application allows for adjustment of the nut's end-face pressure at specific locations via several pressure blocks. During adjustment, a force is applied to the pressure blocks by a force-applying component. The pressure blocks move inward, pressing against the inclined surfaces of the second and third bosses. This causes the second flange to move under the force, achieving pressure adjustment. Using this method, the required pressure can be adjusted to the position of each pressure block, achieving precise pressure regulation.

[0010] In a preferred embodiment, the nut body has a first hole for the connecting rod to pass through, the diameter of the first hole being larger than the diameter of the connecting rod, allowing the nut body to move slightly relative to the connecting rod; the first flange has a second hole for the connecting rod to be inserted, the second hole being fitted with the connecting rod via an interference fit or welding for fixation; the second flange has a third hole for the connecting rod to pass through, the diameter of the third hole being larger than the diameter of the connecting rod, allowing the second flange to move slightly relative to the connecting rod; the third flange has a fourth hole for the connecting rod to be inserted, the fourth hole being fitted with the connecting rod via an interference fit or welding for fixation. In this structure, when pressure is adjusted by the squeezing of the pressure block, the pressure causes the second flange to move slightly and applies force to the nut body, achieving adaptive pressure adjustment.

[0011] In a preferred embodiment, the pressure regulating assembly further includes a plurality of locking blocks, the force-applying element is disposed on the locking block, and the locking block is assembled between the second flange and the third flange, resulting in a compact assembly structure.

[0012] In a preferred embodiment, the second flange is provided with a first groove, the third flange is provided with a second groove, and the locking block is provided with protruding edges on both sides. The protruding edges on both sides are respectively placed in the first groove and the second groove to achieve limiting and prevent the locking block from coming out.

[0013] In a preferred embodiment, the inner surface of the locking block is provided with a groove, and the pressure block is confined in the groove, thus ensuring proper assembly and preventing the pressure block from moving arbitrarily.

[0014] In a preferred embodiment, the concave cavity is further provided with a plurality of anti-rotation blocks, each anti-rotation block having a groove or hole for the connecting rod to pass through; the anti-rotation blocks and the pressure blocks together constitute an annular structural member placed in the concave cavity. In this structure, the rotation of the annular structural member is prevented by the circumferential upper limit between the connecting rod and the groove, and the assembly structure is carried out without the need for other limiting structures.

[0015] In a preferred embodiment, there are three connecting rods, three anti-rotation blocks evenly distributed, and six pressure blocks, with one anti-rotation block between every two pressure blocks, evenly distributed around the circumference.

[0016] In a preferred embodiment, the force-applying component is a screw, and the locking block is provided with a matching screw hole. The inner end of the screw abuts against the pressure block, and pressure is applied to the pressure block by rotating the screw to adjust the pressure.

[0017] In a preferred embodiment, the first flange is further provided with a plurality of clearance adjusting screw holes, each containing a clearance adjusting screw, the inner end of which abuts against the end face of the nut body. In this structure, by rotating the clearance adjusting screw, pressure can be applied to the end face of the nut body, thereby adjusting the nut pressure.

[0018] Compared with the prior art, the present invention has the following beneficial effects: it provides a precision nut for adjusting pressure in multiple areas of the end face, which can achieve independent adjustment of pressure in multiple areas of the end face after tightening. The adjustment is highly sensitive and plays an important role in adjusting the last 0.002mm runout of precision machine tools, precision instruments and precision components. Attached Figure Description

[0019] Figure 1 For the three-dimensional representation of the precision nut in this application Figure 1 .

[0020] Figure 2 For the three-dimensional representation of the precision nut in this application Figure 2 .

[0021] Figure 3 This is a side view of the precision nut in this application.

[0022] Figure 4 for Figure 3 A cross-sectional view along the AA direction.

[0023] Figure 5 This is a cross-sectional view of a portion of the structure of the precision nut in this application.

[0024] Figure 6 A three-dimensional view of a precision nut with the nut body omitted.

[0025] Figure 7 For the three-dimensional shape of the second and third flanges Figure 1 .

[0026] Figure 8 For the three-dimensional shape of the second and third flanges Figure 2 .

[0027] Figure 9This is a side view of the second and third flanges.

[0028] Figure 10 A perspective view of the second and third flanges and the pressure regulating components thereon.

[0029] Figure 11 A three-dimensional view of a portion of the pressure regulating component.

[0030] Figure 12 This is an exploded view of the precision nut in this application. Detailed Implementation

[0031] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0032] In the following embodiments, the same or similar reference numerals denote the same or similar components or components with the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0033] In the description of this invention, it should be understood that terms such as center, longitudinal, transverse, length, width, thickness, upper, lower, front, rear, left, right, vertical, horizontal, top, bottom, inner, outer, clockwise, counterclockwise, etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing and simplifying the description of this invention; therefore, they should not be construed as limiting this invention. Furthermore, terms such as first, second, etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features shown. In the description of this invention, unless otherwise expressly specified and limited, terms such as installation, connection, linking, etc., should be interpreted broadly, and those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0034] In the existing technology, there are also some precision nuts that can adjust pressure, but their structure has several unreasonable aspects: First, the screw used to adjust the pressure can only be tightened at the end face, which cannot be used when the position of the end face is restricted in some specific assembly structures; second, the structure is not an independent whole, which is extremely inconvenient to use; third, the transition tightening flange is a whole, and when adjusting the screw, the transition tightening flange has a large pressure impact on the surrounding area, and the pressure adjustment is not sensitive enough.

[0035] The technical solution for the precision nut in this application is as follows.

[0036] See Figures 1 to 12This application discloses a precision nut for multi-zone pressure adjustment on an end face, comprising a nut body 1, a first flange 2 at one end of the nut body 1, a second flange 3 at the other end of the nut body 1, and a third flange 4 at the outer end of the second flange 3; the nut body 1, the first flange 2, the second flange 3, and the third flange 4 are all cylindrical structures with a central hole; the nut body 1, the first flange 2, the second flange 3, and the third flange 4 are connected in series by a plurality of through-type connecting rods 7; one end of the connecting rod 7 is fixedly connected to the first flange 2, and the other end of the connecting rod 7 is fixedly connected to the third flange 4; there is a clearance fit between the nut body 1 and the connecting rod 7, and there is also a clearance fit between the second flange 3 and the connecting rod 7.

[0037] In the precision nut of this application, the second flange 3 has a protruding second boss 35 on its end face facing the third flange 4, and the third flange 4 has a protruding third boss 45 on its end face facing the second flange 3. The second boss 35 and the third boss 45 abut against each other. Both the second boss 35 and the third boss 45 have inclined surfaces, which create a circumferential concave cavity 340 at the junction of the second boss 35 and the third boss 45. The application also includes a pressure regulating assembly, which includes a plurality of pressure blocks 8 and a force-applying member 6 that matches the pressure blocks 8. The pressure blocks 8 are disposed in the concave cavity 340, and the pressure blocks 8 have surfaces that abut against the inclined surfaces on the second boss 35 and the third boss 45. The force of the force-applying member 6 acts on the pressure blocks 8 and squeezes the inclined surfaces, causing a slight change in the position of the second flange 3.

[0038] Specifically, in this application, the nut body 1 has a first hole 12 for the connecting rod 7 to pass through, the diameter of the first hole 12 being larger than the diameter of the connecting rod 7, allowing the nut body 1 to move slightly relative to the connecting rod 7; the first flange 2 has a second hole 22 for the connecting rod 7 to be inserted, the second hole 22 being fitted with the connecting rod 7 by interference fit or welding for fixation; the second flange 3 has a third hole 32 for the connecting rod 7 to pass through, the diameter of the third hole 32 being larger than the diameter of the connecting rod 7, allowing the second flange 3 to move slightly relative to the connecting rod 7; the third flange 4 has a fourth hole 42 for the connecting rod 7 to be inserted, the fourth hole 42 being fitted with the connecting rod 7 by interference fit or welding for fixation. In this structure, when pressure is adjusted by the squeezing of the pressure block 8, the pressure causes the second flange 3 to move slightly and applies force to the nut body 1, achieving adaptive pressure adjustment.

[0039] Furthermore, as can be seen from the accompanying drawings, the pressure regulating assembly in this application also includes several locking blocks 5, the force-applying element 6 is disposed on the locking block 5, and the locking block 5 is assembled between the second flange 3 and the third flange 4, resulting in a compact assembly structure.

[0040] Furthermore, the second flange 3 is provided with a first groove 36, the third flange 4 is provided with a second groove 46, and the locking block 5 is provided with protruding edges 53 on both sides. The protruding edges 53 on both sides are respectively placed in the first groove 36 and the second groove 46 to achieve limiting and prevent the locking block 5 from coming out. The inner surface of the locking block 5 is provided with a groove 57, and the pressure block 8 is limited in the groove 57. The assembly structure is in place to prevent the pressure block 8 from moving at will.

[0041] Furthermore, in this application, the concave cavity 340 is also provided with a plurality of anti-rotation blocks 9, and the anti-rotation blocks 9 are provided with grooves 91 or holes for the connecting rod 7 to pass through; the anti-rotation blocks 9 and the pressure blocks 8 together constitute an annular structural member placed in the concave cavity 340. In this structure, the rotation of the annular structural member is avoided by the circumferential upper limit between the connecting rod 7 and the groove 91, and the assembly structure is carried out without the need for other limiting structures.

[0042] In the embodiments of this application, there are three connecting rods 7, three anti-rotation blocks 9 evenly distributed, and six pressure blocks 8, with one anti-rotation block 9 between every two pressure blocks 8, evenly distributed on the circumference.

[0043] In one embodiment of this application, the force-applying component 6 is a screw, and the locking block 5 is provided with a matching screw hole. The inner end of the screw abuts against the pressure block 8, and pressure is applied to the pressure block 8 by rotating the screw to adjust the pressure.

[0044] Furthermore, as can be seen from the accompanying drawings, in this application, the first flange 2 is also provided with a plurality of clearance adjustment screw holes 21, and clearance adjustment screws 23 are provided in the clearance adjustment screw holes 21. The inner end of the clearance adjustment screw 23 can abut against the end face of the nut body 1. In this structure, by rotating the clearance adjustment screw 23, pressure can also be applied to the end face of the nut body 1 to achieve adjustment of the nut pressure.

[0045] The above describes the precision nut in this application. Its structural design is tailored to the fact that most application scenarios require circumferential pressure adjustment, meaning that circumferential pressure adjustment is the primary method, while end-face pressure adjustment can also be used as a secondary method. The structural design is optimized in three ways: First, it adopts a dual-position tightening pressure structure, which allows for both end-face tightening (via the gap adjustment screw 23) and circumferential tightening (via the force-applying component 6). Second, it adopts an integral structural design, with all parts cleverly connected as a whole by the connecting rod 7. Third, it uses a split structure (several pressure blocks 8 are adjusted in conjunction with the force-applying component 6) for multi-area circumferential pressure adjustment, resulting in high adjustment sensitivity.

[0046] In use: The inner surface of the nut body 1 is threaded. Adjust the clearance adjusting screw 23 to thread the nut body 1 onto the screw. After installation, rotate the force-applying component 6 to press the corresponding pressure block 8. The pressure is transmitted to the second flange 3 and the nut body 1 to achieve pressure adjustment. During the adjustment process, a screwdriver with pressure or torque display function can be used to adjust multiple force-applying components 6 to the same value to complete the pressure adjustment.

[0047] The multi-zone pressure-adjustable precision nut of this application allows for adjustment of the nut end-face pressure at specific locations via several pressure blocks 8. During adjustment, force is applied to the pressure blocks 8 by the force-applying component 6. The pressure blocks 8 move inward, pressing against the inclined surfaces on the second boss 35 and the third boss 45. At this time, the second flange 3 moves under the force, achieving the purpose of pressure adjustment. Using this method, the required pressure can be adjusted to the position of each pressure block 8, achieving precise pressure adjustment.

[0048] As described above, the present invention provides a precision nut for adjusting pressure in multiple areas of the end face. After tightening, it can achieve independent pressure adjustment in multiple areas of the end face. This adjustment has high sensitivity and plays an important role in adjusting the final 0.002mm runout of precision machine tools, precision instruments, and precision components.

[0049] The scope of protection of this invention includes, but is not limited to, the above embodiments. The scope of protection of this invention is defined by the claims. Any substitutions, modifications, or improvements to this technology that are easily conceived by those skilled in the art fall within the scope of protection of this invention.

Claims

1. A precision nut with multi-zone pressure adjustment on the end face, characterized in that, Includes a nut body (1), one end of which is provided with a first flange (2), the other end of which is provided with a second flange (3), and the outer end of the second flange (3) is provided with a third flange (4); The nut body (1), the first flange (2), the second flange (3), and the third flange (4) are all cylindrical structures with a central hole; The nut body (1), the first flange (2), the second flange (3), and the third flange (4) are connected in series by several through connecting rods (7); one end of the connecting rod (7) is fixedly connected to the first flange (2), and the other end of the connecting rod (7) is fixedly connected to the third flange (4). The nut body (1) and the connecting rod (7) are fitted with a clearance fit, and the second flange (3) and the connecting rod (7) are also fitted with a clearance fit. The second flange (3) has a protruding second boss (35) on its end face facing the third flange (4), and the third flange (4) has a protruding third boss (45) on its end face facing the second flange (3). The second boss (35) and the third boss (45) abut against each other. Both the second boss (35) and the third boss (45) are provided with inclined surfaces, which make a circumferential concave cavity (340) at the junction of the second boss (35) and the third boss (45). It also includes a pressure regulating assembly, which includes a plurality of pressure blocks (8) and a force-applying element (6) matching the pressure blocks (8). The pressure blocks (8) are disposed in the concave cavity (340), and the pressure blocks (8) are provided with a surface that abuts against the inclined surfaces on the second boss (35) and the third boss (45). The force of the force-applying element (6) acts on the pressure blocks (8) and squeezes the inclined surfaces to cause a slight change in the position of the second flange (3). The nut body (1) is provided with a first hole (12) through which the connecting rod (7) passes, and the diameter of the first hole (12) is larger than the diameter of the connecting rod (7); The first flange (2) is provided with a second hole (22) for inserting the connecting rod (7), and the second hole (22) and the connecting rod (7) are assembled by interference fit or welding. The second flange (3) is provided with a third hole (32) through which the connecting rod (7) passes, and the diameter of the third hole (32) is larger than the diameter of the connecting rod (7); The third flange (4) is provided with a fourth hole (42) for inserting the connecting rod (7), and the fourth hole (42) and the connecting rod (7) are assembled by interference fit or welding. The pressure regulating assembly also includes several locking blocks (5), the force-applying element (6) is disposed on the locking block (5), and the locking block (5) is assembled between the second flange (3) and the third flange (4); The second flange (3) is provided with a first groove (36), the third flange (4) is provided with a second groove (46), and the locking block (5) is provided with protruding edges (53) on both sides. The protruding edges (53) on both sides are respectively placed in the first groove (36) and the second groove (46) to achieve limiting. The inner surface of the locking block (5) is provided with a groove (57), and the pressing block (8) is limited to the groove (57); The concave cavity (340) is also provided with a number of anti-rotation blocks (9), and the anti-rotation blocks (9) are provided with grooves (91) or holes for the connecting rod (7) to pass through; the anti-rotation blocks (9) and the pressure blocks (8) together constitute an annular structure placed in the concave cavity (340); The first flange (2) is also provided with a number of gap adjustment screw holes (21), and a gap adjustment screw (23) is provided in the gap adjustment screw hole (21). The inner end of the gap adjustment screw (23) can abut against the end face of the nut body (1).

2. The precision nut for adjusting pressure in multiple end faces according to claim 1, characterized in that, The number of connecting rods (7) is three, the number of anti-rotation blocks (9) is three, the number of pressure blocks (8) is six, and an anti-rotation block (9) is set between every two pressure blocks (8).

3. The precision nut for adjusting pressure in multiple end faces according to claim 2, characterized in that, The force-applying component (6) is a screw, and the locking block (5) has a matching screw hole, with the inner end of the screw abutting against the pressure block (8).

Images