Improved anti-loosening thread fastening kit

Abstract

The invention discloses an improved anti-loosening thread fastening kit. The improved anti-loosening thread fastening kit comprises a bolt, a nut and a gasket. A positioning groove is formed in the bolt in the axial direction. A plurality of nut surface A anti-skid teeth and a plurality of nut surface B anti-skid teeth which are rotationally and symmetrically distributed are densely distributed on the two end surfaces of the nut respectively; the gaskets are C-shaped elastic gaskets provided with anti-skid devices, positioning blocks matched with the positioning grooves are arranged at the positions, opposite to the notches of the C, of the inner ring of the second gasket, the second gasket is divided into three arc-shaped sections in a segmented mode, the two sections close to the notches are the first section and the second section respectively, and the third section is the third section. The first section and the second section are thinner than the third section; the top surface of the section A is flush with the top surface of the section C, and at least one row of clamping teeth A is arranged at the position, close to the notch C, of the top surface of the section A; the bottom face of the second section is flush with the bottom face of the third section, and at least one row of second clamping teeth are arranged at the position, close to the notch C, of the bottom face of the second section. The structure is compact, cost is low, anti-loosening reliability is good, installation, disassembly and maintenance cost is low, and service life is long.

Description

Technical Field

[0001] The invention belongs to the technical field of standard parts and relates to an improved anti-loosening thread fastening kit. Background Art

[0002] Threaded fastening kits are the main category of standard parts and are widely used in various fields. Standardized threaded fastening kits have many series of products, usually including matching bolts, nuts, and washers.

[0003] The threaded fastening kit using such technology can certainly be used normally in various conventional applications, but it is not suitable for occasions such as high-speed rail tracks where vibration is frequent and large and reliability requirements are high. A specially designed anti-loosening threaded fastening kit must be used.

[0004] Among the existing anti-loosening thread fastening kits, the most well-known one is the anti-loosening thread fastening kit of Hard Lock Industries, Ltd. of Japan. Its bolts and washers have no essential structural difference from the corresponding ordinary parts. The key point of its innovative anti-loosening technology lies in its nuts that are said to never loosen, which were used in Japan's Shinkansen 50 years ago. The principle of anti-loosening of Hard Lock nuts: First of all, this kind of nut is used in pairs, divided into concave nuts and convex nuts. When installing, the convex nut is installed first at the bottom and the concave nut is installed at the top. The convex nut is manufactured by eccentric processing, while the concave nut is processed by normal center symmetry. When the two convex and concave nuts are screwed together, they are clamped like inserting a wedge in the nut, thereby achieving the effect of anti-loosening. The products of this Japanese company are basically fully adopted in my country's high-speed rail tracks.

[0005] The anti-loosening thread fastening kit using this technology has a simple structure and high reliability, but it has high requirements for machining accuracy and is quite expensive. For example, the reference price of an M10 Japanese never loose nut is 18.87 yuan, while the reference price of a domestic ordinary nut of the same specification is 0.45 yuan, a price difference of 42 times. The core technology in this area is in the hands of others, which costs more and is controlled by others. Although the product has a simple structure, it has specific requirements for the installation and disassembly process. The concave nut and the convex nut are used in pairs and have poor interchangeability.

[0006] For high-speed rail applications with large quantities and high requirements, whether it can be applied, on the premise of meeting the rigid technical requirements for anti-loosening, also needs to comprehensively evaluate the following four performance indicators:

[0007] A, manufacturing cost;

[0008] B, installation cost;

[0009] C, disassembly and maintenance cost;

[0010] D, service life;

[0011] Many domestic companies or individuals have also designed many technical solutions for anti-loosening thread fastening kits.

[0012] For example, a Chinese patent application with publication (announcement) number CN11 6379059A entitled “An Anti-loosening Thread Fastening Kit” discloses an anti-loosening thread fastening kit, such as Figure 1 , Figure 2 , Figure 3 As shown, it includes a bolt 6, a nut 1, and a gasket; a positioning groove 7 is provided on the screw surface of the bolt 6 along the axial direction; one end surface of the nut 1 is densely provided with a plurality of nut A surface anti-skid teeth 2a which are rotationally symmetrically distributed with the central axis of the nut 1 as the symmetry axis, and the other end surface of the nut 1 is densely provided with a plurality of nut B surface anti-skid teeth 2b which are rotationally symmetrically distributed with the central axis of the nut 1 as the symmetry axis; the gasket is an elastic gasket, and an anti-skid device is provided on the gasket, and the gasket is a circular ring-shaped gasket with a concave lens-shaped outer contour 4, a positioning block 3 matched with the positioning groove 7 is arranged on the inner ring of the A gasket 4, the two sides of the A gasket 4 close to the inner ring are flat ring parts, the two sides of the A gasket 4 close to the outer ring are truncated cone-shaped annular recesses, and the two truncated cone-shaped annular recesses are respectively provided with a plurality of gasket A surface anti-skid teeth 5a and a plurality of gasket B surface anti-skid teeth 5b which are rotationally symmetrically distributed with the central axis of the A gasket 4 as the symmetry axis; a circular groove 8 is arranged in the middle of the circumferential surface of the A gasket 4, and the cross-section of the circular groove 8 is V-shaped.

[0013] The anti-loosening thread fastening kit using such technology can certainly achieve the technical purpose of anti-loosening, but it has the following shortcomings:

[0014] During the tightening or loosening process, since gasket A 4 is a circular ring-shaped gasket A with a concave lens-shaped outer contour, it is obviously elastic. When locking or disassembling, the resistance along the rotation direction between the anti-skid teeth 2a on the nut A side or the anti-skid teeth 2b on the nut B side and the corresponding anti-skid teeth 5a on the gasket A side or the corresponding anti-skid teeth 5b on the gasket B side is large, which can easily damage the corresponding tooth body. The difficulty coefficient of installation and disassembly is relatively large. Gasket A 4 is pressed very tightly by the nut 1 during use, and its elastomeric structure is prone to plastic deformation and failure. It often cannot be reused after disassembly, has a relatively short service life, and the use effect is not ideal enough. Summary of the invention

[0015] In order to overcome the deficiencies of the prior art, the present invention provides an improved anti-loosening thread fastening kit which has a more compact structure, lower installation and disassembly maintenance costs, and a longer service life.

[0016] The technical solution adopted by the present invention to achieve the above technical purpose is: an improved anti-loosening thread fastening kit, including a bolt, a nut, and a gasket; a positioning groove is opened axially on the screw surface of the bolt; one end surface of the nut is densely provided with a plurality of nut A-side anti-skid teeth distributed rotationally symmetrically with the central axis of the nut as the symmetry axis, and the other end surface of the nut is densely provided with a plurality of nut B-side anti-skid teeth distributed rotationally symmetrically with the central axis of the nut as the symmetry axis; the gasket is an elastic gasket, and an anti-skid device is provided on the gasket, and the gasket is a C-shaped B gasket, and the B gasket A positioning block matched with the positioning groove is arranged on the inner ring of the plate opposite to the notch of C. The B gasket is divided into three arc segments along the circumferential direction. The two segments close to the notch are segment A and segment B, and the third segment is segment C. The thickness of segment A and segment B is less than that of segment C. The top surface of segment A is flush with the top surface of segment C, and at least one row of A clamping teeth matched with the anti-slip teeth are arranged on the top surface of segment A near the notch of C; the bottom surface of segment B is flush with the bottom surface of segment C, and at least one row of B clamping teeth matched with the anti-slip teeth are arranged on the bottom surface of segment B near the notch of C.

[0017] The sum of the tooth height of the A-grip tooth and the thickness of the A-segment is less than or equal to the thickness of the C-segment; the sum of the tooth height of the B-grip tooth and the thickness of the B-segment is less than or equal to the thickness of the C-segment.

[0018] The first latch tooth and the second latch tooth are triangular prisms.

[0019] The outer edges of the triangular prism are provided with arc transitions, and the tooth tops of the anti-slip teeth are provided with arc transitions.

[0020] The step connection between the section A and the section C is provided with an arc transition; the step connection between the section B and the section C is provided with an arc transition.

[0021] The B gasket is formed by stamping. During stamping, an acute spatial angle is set between the opposite surfaces of section A and section B. When the angle is set, the spacing between the A clamping teeth and the B clamping teeth is greater than the spacing when there is no angle.

[0022] The beneficial effects of the present invention are as follows: due to the adoption of the above technical scheme, the structure is compact and the cost is lower, the anti-loosening reliability is better, the installation and disassembly maintenance cost is lower, the service life is longer, and the use effect is more ideal. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] Figure 1 is a schematic diagram of a prior art anti-loosening thread fastening kit;

[0025] Figure 2 It is a schematic diagram of another view of the prior art anti-loosening thread fastening kit;

[0026] Figure 3 It is a schematic diagram of a gasket portion in the prior art;

[0027] Figure 4 is a schematic diagram of the present invention;

[0028] Figure 5 is a schematic diagram of another viewing direction of the present invention;

[0029] Figure 6 It is a schematic diagram of the gasket part B in the present invention;

[0030] Figure 7 It is a schematic diagram of another viewing direction of the B gasket part in the present invention.

[0031] The marking numbers in the accompanying drawings are explained as follows: nut 1, anti-slip teeth on nut A side 2a, anti-slip teeth on nut B side 2b, positioning block 3, A gasket 4, anti-slip teeth on gasket A side 5a, anti-slip teeth on gasket B side 5b, bolt 6, positioning groove 7, annular groove 8, B gasket 9, A clamping teeth 10a, B clamping teeth 10b, A section 11a, B section 11b, angle 12. DETAILED DESCRIPTION

[0032] Embodiments of the present invention, such as Figures 4 to 7 As shown, an improved anti-loosening thread fastening kit comprises a bolt 6, a nut 1, and a gasket; a positioning groove 7 is provided on the screw surface of the bolt 6 along the axial direction; one end surface of the nut 1 is densely provided with a plurality of nut A surface anti-skid teeth 2a which are rotationally symmetrically distributed with the central axis of the nut 1 as the symmetry axis, and the other end surface of the nut 1 is densely provided with a plurality of nut B surface anti-skid teeth 2b which are rotationally symmetrically distributed with the central axis of the nut 1 as the symmetry axis; the gasket is an elastic gasket, and an anti-skid device is provided on the gasket, and the gasket is a C-shaped B gasket 9, and a positioning groove 7 is provided on the inner ring of the B gasket 9 opposite to the notch of C. The positioning block 3 is matched with the positioning groove 7, and the B gasket 9 is segmented into three arc sections along the circumferential direction. The two sections close to the notch are respectively section A 11a and section B 11b, and the third section is section C; the thickness of section A 11a and section B 11b is less than the thickness of section C; the top surface of section A 11a is flush with the top surface of section C, and the notch near C on the top surface of section A 11a is provided with at least one row of A clamping teeth 10a matched with the anti-slip teeth; the bottom surface of section B 11b is flush with the bottom surface of section C, and the notch near C on the bottom surface of section B 11b is provided with at least one row of B clamping teeth 10b matched with the anti-slip teeth.

[0033] The sum of the tooth height of the A-grip tooth 10a and the thickness of the A-segment 11a is less than or equal to the thickness of the C-segment; the sum of the tooth height of the B-grip tooth 10b and the thickness of the B-segment 11b is less than or equal to the thickness of the C-segment.

[0034] The first latch tooth 10a and the second latch tooth 10b are triangular prisms.

[0035] The outer edges of the triangular prism are provided with arc transitions, and the tooth tops of the anti-slip teeth are provided with arc transitions.

[0036] The step connection between the section A 11a and the section C is provided with an arc transition; the step connection between the section B 11b and the section C is provided with an arc transition.

[0037] The B gasket 9 is formed by stamping. During stamping, an acute spatial angle 12 is set between the opposite surfaces of the A section 11a and the B section 11b. When the angle 12 is set, the spacing between the A clamping tooth 10a and the B clamping tooth 10b is greater than the spacing when there is no angle.

[0038] Further description of the present invention:

[0039] The bolt 6 can be processed into the positioning groove 7 at the same time based on the common bolt processing technology.

[0040] The nut 1 can be punched out with a stamping device equipped with corresponding upper and lower dies based on a common nut processing technology to simultaneously punch out the anti-skid teeth 2a on the nut A side and the anti-skid teeth 2b on the nut B side.

[0041] During the process of punching the inner ring hole of the gasket, the positioning block 3 is punched out by modifying the mold, and the upper and lower planar molds of the traditional stamping gasket are changed into two sets of upper and lower special-shaped molds to press the A section 11a, the B section 11b, the A clamping tooth 10a, the B clamping tooth 10b and the corresponding transition part, and the angle 12 is formed and punched out at the same time.

[0042] After machining is completed, it is completed after unified heat treatment.

[0043] The invention has a simple structure and has no special requirements for the installation and disassembly process.

[0044] The present invention is used for tightening, and the positioning groove 7 cooperates with the positioning block 3, and the second gasket 9 will not rotate relative to the bolt 6. When the nut 1 is tightened forcefully with a wrench, the anti-skid teeth compress the latching teeth to drive the first section 11a or the second section 11b to elastically retreat. When the nut is screwed into place, the latching teeth are elastically clamped in the concave portion of the corresponding anti-skid teeth, and the nut 1 is clamped with the second gasket 9. The rotational force decomposed and generated by the vibration during use is relatively small, and the nut 1 is not easy to be loosened from the second gasket 9 along the rotational direction. It can be loosened only when the wrench is used to rotate with a larger rotational force. Since the first section 11a and the second section 11b of the second gasket 9 are thinner than the third section, there is space for the elastically aligned latching teeth after elastic retreat. When the nut 1 is tightened, only the third section on the second gasket 9 is completely pressed. The elastic structure of the second gasket 9 is not easy to fail due to plastic deformation. The second gasket 9 can be reused after disassembly. The bolt 6 and the nut 1 have thick structures and are not easy to be damaged, and can basically be reused.

[0045] The purpose of the double-sided arrangement of the anti-slip teeth on the nut 1 of the present invention and the double-sided arrangement of the locking teeth on the gasket 9 is to facilitate installation. There is no need to select a direction during installation, which can improve the installation efficiency. Although the cost of the double-sided mold is higher than that of the unidirectional mold, it can be completely ignored after being amortized for the mass-produced product.

[0046] Whether to set the angle 12 and the size of the angle 12 depends on the application scenario. The angle 12 can be set when the reliability requirement is high. The higher the reliability requirement, the larger the angle 12 is set. However, the angle 12 should generally not exceed 10 degrees.

[0047] Usually, one row of the first latch teeth 10a and the second latch teeth 10b is sufficient. When the reliability requirement is high, 2-3 rows can be provided. Providing too many rows will greatly increase the resistance during locking or disassembly and cause broken teeth.

[0048] The purpose of providing an arc transition at the step connection between section A 11a and section C and the step connection between section B 11b and section C is to make the connection between the two steps less likely to break and to make section A 11a and section B 11b more elastic.

Claims

1. An improved anti-loosening thread fastening kit, comprising a bolt, a nut, and a gasket; a positioning groove is provided on the screw surface of the bolt along the axial direction; a plurality of nut surface A anti-skid teeth are densely arranged on one end surface of the nut and are symmetrically distributed with the central axis of the nut as the symmetry axis, and a plurality of nut surface B anti-skid teeth are densely arranged on the other end surface of the nut and are symmetrically distributed with the central axis of the nut as the symmetry axis; the gasket is an elastic gasket, and an anti-skid device is provided on the gasket, characterized in that: The gasket is a C-shaped B gasket, and a positioning block matched with the positioning groove is arranged on the inner ring of the B gasket opposite to the notch of C. The B gasket is divided into three arc segments along the circumferential direction, and the two segments close to the notch are respectively segment A and segment B, and the third segment is segment C; the thickness of segment A and segment B is less than the thickness of segment C; the top surface of segment A is flush with the top surface of segment C, and the top surface of segment A is close to the notch of C and is provided with at least one row of A clamping teeth matched with the anti-slip teeth; the bottom surface of segment B is flush with the bottom surface of segment C, and the bottom surface of segment B is close to the notch of C and is provided with at least one row of B clamping teeth matched with the anti-slip teeth.

2. The improved anti-loosening thread fastening kit according to claim 1, characterized in that: The sum of the tooth height of the A-grip tooth and the thickness of the A-segment is less than or equal to the thickness of the C-segment; the sum of the tooth height of the B-grip tooth and the thickness of the B-segment is less than or equal to the thickness of the C-segment.

3. The improved anti-loosening thread fastening kit according to claim 2, characterized in that: The first latch tooth and the second latch tooth are triangular prisms.

4. The improved anti-loosening thread fastening kit according to claim 3, characterized in that: The outer edges of the triangular prism are provided with arc transitions, and the tooth tops of the anti-slip teeth are provided with arc transitions.

5. The improved anti-loosening thread fastening kit according to claim 4, characterized in that: The step connection between the section A and the section C is provided with an arc transition; the step connection between the section B and the section C is provided with an arc transition.

6. The improved anti-loosening thread fastening kit according to claim 5, characterized in that: The B gasket is formed by stamping. During stamping, an acute spatial angle is set between the opposite surfaces of section A and section B. When the angle is set, the spacing between the A clamping teeth and the B clamping teeth is greater than the spacing when there is no angle.

Images