Stud bolt

Abstract

The stud bolt comprises a bolt body, external threads are arranged on the outer walls of the middle section of the bolt body towards the two ends, a torsion block coaxial with the center of the bolt body is arranged on the middle section of the bolt body, and external grooves are formed in the positions, close to the end face of the torsion block, of the outer walls of the bolt body, of the two external threads. The outer groove is provided with a supporting gasket, and an inner hole of the supporting gasket is in clearance fit with the groove bottom of the outer groove, and meanwhile the hole diameter is smaller than the large diameter of the outer threads. The side face of the middle section position, in the length direction of the bolt body, of the torsion block is provided with an isolation step with the outer side wall outline larger than that of the outer side wall of the torsion block. The utility model has the advantages that the support can be provided at the middle section position, and the sealing isolation can be realized after the screwing is completed.

Description

Technical Field

[0001] This utility model relates to the field of fasteners, specifically to a double-ended bolt. Background Technology

[0002] Double-ended bolts are fasteners with a wide range of applications. Traditional double-ended bolts are generally threaded throughout the entire length, or the threads at both ends are opposite to each other, or the thread diameters at both ends are not equal, in order to meet the connection requirements of various occasions. Therefore, double-ended bolts with non-through threads often have a smooth shaft in the middle section, which cannot provide support and isolation in the middle section. At the same time, tightening often relies on the screw heads or internal hexagonal holes at both ends. There are also double nuts that are offset against each other to achieve the fastening installation of one end of the thread.

[0003] Due to the variety of equipment structures and fastening methods, the standardization of double-ended bolts can affect the design of some non-standard equipment, making it impossible to meet installation requirements in special installation environments (especially on some uncommon non-standard equipment). Utility Model Content

[0004] Based on the above problems, the purpose of this utility model is to provide a double-ended bolt that can provide support at the middle position and achieve sealing and isolation after tightening.

[0005] To address the above problems, the following technical solution is provided: a double-ended bolt, comprising a bolt body, wherein an external thread is provided on the outer wall of the bolt body from the middle section towards both ends; a torsion block is provided in the middle section of the bolt body and arranged coaxially with the center of the bolt body; an outer groove is provided on the outer wall of the bolt body near the end face of the torsion block for each of the two external threads; a support washer is provided in the outer groove, wherein the inner hole of the support washer is clearance-fitted with the bottom of the outer groove and the hole diameter is smaller than the major diameter of the external thread; and an isolation step is provided on the side of the torsion block at the middle section along the length direction of the bolt body, wherein the outer contour of the outer wall is larger than the outer contour of the outer wall of the torsion block.

[0006] The present invention is further configured such that the torsion block and the bolt body are separately disposed, and the bolt body has a toothed section located between two outer grooves in the middle section, wherein the tooth tip circle diameter and tooth root circle diameter of the toothed section are both larger than the outer groove diameter; the torsion block has a meshing hole at its center that meshes with the toothed section; the toothed section and the meshing hole are interference-fitted with each other.

[0007] The present invention is further configured such that the axial length of the toothed segment is less than or equal to the length of the meshing hole.

[0008] The present invention is further configured such that the supporting pad is a copper pad.

[0009] The present invention is further configured such that the toothed section and the meshing hole have chamfered sides; the side of the support pad facing the torsion block has an outwardly protruding sealing ring, and the rotation radius of the sealing ring corresponds to the pitch circle diameter of the toothed section.

[0010] The present invention is further configured such that the two end faces of the bolt body are provided with protruding heads, the diameter of which is less than or equal to the diameter of the root of the external thread.

[0011] The present invention is further configured such that the external threads have the same or opposite directions.

[0012] The present invention is further configured such that the support pad is installed in the outer groove before the external thread rolling is completed, and is constrained in the outer groove after the thread rolling is completed.

[0013] The present invention is further configured such that the toothed segment and the meshing hole are installed before the external thread rolling is completed, and the major diameter of the external thread is larger than the tooth tip circle diameter of the meshing hole after the thread rolling is completed.

[0014] The present invention is further configured such that the torsion block is square, and the diameter of the support pad is equal to the distance between the two parallel sides of the torsion block.

[0015] The beneficial effects of this utility model are:

[0016] 1. The torsion block can serve as a middle stop, providing support and also as a torsion point during assembly and disassembly; the support washer can seal and isolate the screw hole when tightening, effectively preventing seizing due to rust and other issues. If the inner hole of the support washer is smaller than the major diameter of the external thread, it can be blocked by the external thread to prevent the support washer from coming off; the isolation step can create isolation between the torsion block and the wrench, transferring the force deformation surface between the two ends of the torsion block and the wrench to the isolation step when used as a contact reference surface, preventing damage to the reference surface due to deformation during torsion.

[0017] 2. The toothed section and the meshing hole are connected by an interference fit, which effectively transmits circumferential and axial loads; at the same time, it simplifies the production process.

[0018] 3. The flexibility of the copper gasket is used to achieve the compression sealing effect, and the support gasket can also be replaced by a brass sheet;

[0019] 4. The sealing ring and the support gasket are connected as a whole. When fixed, the sealing ring can be squeezed into the chamfered part of the tooth side of the sealing tooth section and the meshing hole to improve the sealing performance. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0021] Figure 2This is a full-section three-dimensional structural diagram of the present invention.

[0022] Figure 3 This is a schematic diagram of the exploded three-dimensional structure of this utility model.

[0023] Figure 4 This is a schematic diagram of the exploded full-section three-dimensional structure of this utility model.

[0024] The meanings of the labels in the diagram are as follows: 10-bolt body; 11-external thread; 12-external groove; 13-toothed section; 14-protrusion; 20-torsion block; 21-isolation step; 22-meshing hole; 30-support gasket; 31-sealing ring. Detailed Implementation

[0025] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0026] refer to Figures 1 to 4 ,like Figures 1 to 4 The double-ended bolt shown includes a bolt body 10. The bolt body 10 has an external thread 11 on its outer wall extending from its middle section towards both ends. A torsion block 20, coaxially arranged with the center of the bolt body 10, is located in the middle section of the bolt body 10. The outer wall of the bolt body 10 near the end face of the torsion block 20 has an external groove 12. A support washer 30 is provided in the external groove 12. The inner hole of the support washer 30 is clearance-fitted with the bottom of the external groove 12, and its diameter is smaller than the major diameter of the external thread 11. The torsion block 20 has an isolation step 21 on its side at the middle section along the length of the bolt body 10, with an outer outer wall contour larger than the outer outer wall contour of the torsion block 20.

[0027] In the above structure, the torsion block 20 can serve as a middle stop, providing support and also as a torsion point during assembly and disassembly. The support washer 30 can seal and isolate the screw hole when tightened, and can also effectively prevent seizing caused by rust and other problems. The inner hole of the support washer 30 is smaller than the major diameter of the external thread 11, which can be blocked by the external thread 11 to prevent the support washer 30 from coming out. The isolation step 21 can create an isolation between itself and the torsion block 20, so that when the two ends of the torsion block 20 are used as a contact reference surface, the force deformation surface between it and the wrench is transferred to the isolation step 21, preventing the reference surface from being damaged due to deformation and other problems during the torsion process.

[0028] In this embodiment, the torsion block 20 and the bolt body 10 are separately arranged. The bolt body 10 has a toothed section 13 located between the two outer grooves 12 in the middle section. The tooth tip circle diameter and tooth root circle diameter of the toothed section 13 are both larger than the diameter of the outer grooves 12. The torsion block 20 has a meshing hole 22 at its center that meshes with the toothed section 13. The toothed section 13 and the meshing hole 22 are interference-fitted with each other.

[0029] In the above structure, the toothed section 13 and the meshing hole 22 are connected by an interference fit, which effectively transmits circumferential load and axial load; at the same time, it simplifies the production process.

[0030] In this embodiment, the axial length of the toothed segment 13 is less than or equal to the length of the meshing hole 22.

[0031] In the above structure, the axial length of the toothed segment 13 is preferably equal to the length of the meshing hole 22.

[0032] In this embodiment, the support pad 30 is a copper pad.

[0033] In the above structure, the flexibility of the copper gasket is used to achieve the compression sealing effect, and the support gasket 30 can also be replaced by a brass sheet.

[0034] In this embodiment, the toothed sections 13 and the meshing holes 22 have chamfered sides; the support pad 30 has an outwardly protruding sealing ring 31 on the side facing the torsion block 20, and the rotation radius of the sealing ring 31 corresponds to the pitch circle diameter of the toothed section 13.

[0035] In the above structure, the sealing ring 31 is integrally connected with the support gasket 30. When fixed, the sealing ring 31 can be squeezed into the chamfered part of the tooth side of the sealing tooth section 13 and the meshing hole 22 to improve the sealing performance.

[0036] In this embodiment, the bolt body 10 has protruding protrusions 14 on both end faces, and the diameter of the protrusions 14 is less than or equal to the diameter of the root of the external thread 11.

[0037] In the above structure, the protrusion 14 can provide guidance during installation.

[0038] In this embodiment, the external threads 11 have the same or opposite directions.

[0039] In this embodiment, the support pad 30 is installed into the outer groove 12 before the external thread 11 is rolled, and is constrained in the outer groove 12 after the rolling is completed.

[0040] In the above structure, the diameter of the external thread 11 is increased after rolling to limit the dislodgement of the support pad 30.

[0041] In this embodiment, the toothed segment 13 and the meshing hole 22 are installed before the external thread 11 is rolled, and after the rolling is completed, the major diameter of the external thread 11 is larger than the tooth tip circle diameter of the meshing hole 22.

[0042] The above structure can prevent interference between the two.

[0043] In this embodiment, the torsion block 20 is square, and the diameter of the support pad 30 is equal to the distance between the two parallel sides of the torsion block 20.

[0044] In the above structure, the torsion block 20 can also be set as a regular hexagon.

[0045] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model. These improvements and modifications assumed above should also be considered within the protection scope of the present utility model.

Claims

1. A double-ended bolt, comprising a bolt body, wherein the outer wall of the bolt body from the middle section toward both ends is provided with an external thread, characterized in that: The bolt body has a torsion block arranged coaxially with the center of the bolt body in the middle section. The outer wall of the bolt body near the end face of the torsion block of the two external threads is provided with an outer groove. The outer groove is provided with a support washer. The inner hole of the support washer is clearance-fitted with the bottom of the outer groove, and the hole diameter is smaller than the major diameter of the external thread. The torsion block has an isolation step on the side of the middle section of the bolt body in the length direction, and the outer contour of the outer wall is larger than the outer contour of the outer wall of the torsion block.

2. A double-ended bolt according to claim 1, characterized in that: The torsion block and the bolt body are separately arranged. The bolt body has a toothed section in the middle section located between two outer grooves. The toothed section has a tooth tip circle diameter and a tooth root circle diameter that are both larger than the outer groove diameter. The torsion block has a meshing hole at its center that meshes with the toothed section. The toothed section and the meshing hole are interference-fitted with each other.

3. A double-ended bolt according to claim 2, characterized in that: The axial length of the toothed segment is less than or equal to the length of the meshing hole.

4. A double-ended bolt according to claim 1, characterized in that: The support pad is a copper pad.

5. A double-ended bolt according to claim 2 or 3, characterized in that: The toothed section and the meshing hole have chamfered sides; the side of the support pad facing the torsion block has an outwardly protruding sealing ring, and the rotation radius of the sealing ring corresponds to the pitch circle diameter of the toothed section.

6. A double-ended bolt according to claim 1, characterized in that: The bolt body has protruding heads on both ends, and the diameter of the protruding heads is less than or equal to the diameter of the external thread root.

7. A double-ended bolt according to claim 1, characterized in that: The external threads have the same or opposite directions.

8. A double-ended bolt according to claim 1, characterized in that: The support pad is installed in the outer groove before the external thread rolling is completed, and is constrained in the outer groove after the thread rolling is completed.

9. A double-ended bolt according to claim 2, characterized in that: The toothed section and the meshing hole are installed before the external thread rolling is completed, and after the rolling is completed, the major diameter of the external thread is larger than the tooth tip circle diameter of the meshing hole.

10. A double-ended bolt according to claim 1, characterized in that: The torsion block is square, and the diameter of the support pad is equal to the distance between the two parallel sides of the torsion block.

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