Airtight bolt and machining device thereof

Abstract

The utility model belongs to the technical field of bolts, and particularly relates to an airtight bolt and a machining device thereof. An airtight bolt comprises a nut and a screw, the screw is provided with a threaded section and a smooth section, the smooth section is arranged at one end, corresponding to the nut, of the screw, the smooth section is movably sleeved with a gasket, the inner diameter of the gasket is provided with an airtight ring part, and the inner diameter of the gasket is larger than the outer diameter of the threaded section. The inner diameter of the airtight ring part is smaller than the outer diameter of the threaded section; a machining device for machining an airtight bolt comprises a die and a stamping mechanism. According to the utility model, the air tightness of the product is greatly improved, the air tightness performance of the product is optimized and improved, the reworking and repairing times of a client are reduced, the cost is greatly reduced for the client, and meanwhile, the gasket can slide up and down on the smooth section but cannot be separated from the threaded section, so that the stability is higher, additional assembly is not needed, the use is convenient and simple, and the efficiency is high.

Description

Technical Field

[0001] The utility model belongs to the technical field of bolts, and in particular relates to an airtight bolt and a processing device thereof. Background Art

[0002] With the rapid development of automobiles today, OEMs have higher and higher requirements for transmissions. In the process of in-depth research on transmissions, it was found that the airtightness was not enough to meet the requirements if the bolts and aluminum washers were supplied separately and screwed in after assembly at the line. If five bolts were installed on an engine, one or two of them would leak oil. The airtightness was poor and unstable. Utility Model Content

[0003] In summary, in order to overcome the deficiencies of the prior art, the utility model provides an anti-loosening bolt which is safe and convenient to use, has a more reasonable and simple structure, and has a lower cost.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an airtight bolt, comprising a nut and a screw rod, the screw rod being provided with a threaded section and a smooth section, the smooth section being provided at one end of the screw rod corresponding to the nut, a washer being movably sleeved on the smooth section, an airtight ring portion being provided on the inner diameter of the washer, the inner diameter of the washer being larger than the outer diameter of the threaded section, and the inner diameter of the airtight ring portion being smaller than the outer diameter of the threaded section.

[0005] By adopting the above technical solution, the inner diameter of the gasket is reduced, and the bolt and the gasket are riveted together, so that the aluminum gasket and the bolt fit tightly, and the gearbox fits tightly during the actual assembly process, which greatly improves the airtightness of the product, optimizes and improves the airtightness of the product, reduces the number of rework and repair times of the client, and greatly reduces the cost for the customer. At the same time, the gasket can slide up and down in the smooth section and rotate circumferentially, but cannot be separated from the threaded section. Therefore, it has higher stability, does not require additional assembly, is easy to use, and has high efficiency.

[0006] The utility model is further configured that: the spacing between the inner diameter of the airtight ring portion and the smooth section is n, 0.2 mm≤n≤0.3 mm.

[0007] By adopting the above technical solution, the gasket can slide up and down on the smooth section without affecting the air tightness of its assembly.

[0008] The utility model is further configured that: the height difference between the airtight ring portion and the gasket is h, 0.4mm≤h≤0.5mm.

[0009] By adopting the above technical solution, the deformation strength of the gasket is ensured while ensuring air tightness.

[0010] The utility model is further provided that: the airtight ring portion is formed by riveting the inner diameter of the gasket to cause a small deformation.

[0011] By adopting the above technical solution, the processing is simple, the efficiency is high and the cost is low.

[0012] The utility model is further provided that: a Magnili coating is provided on the outside of the screw.

[0013] By adopting the above technical solution, the surface coating using Magni solution can better improve the air tightness, Magni cooperates better with the aluminum pad, and the friction coefficient is at the lower limit.

[0014] A processing device for processing airtight bolts, including a mold and a stamping mechanism, the mold including a base and a mold core, the mold core is arranged on the base, the mold core includes a receiving groove adapted to the screw rod and a forming groove for receiving a gasket, the receiving groove is arranged with upper and lower openings, the forming groove is surrounded by a forming convex portion for riveting and deforming the gasket corresponding to the opening of the receiving groove, a hollow setting is arranged in the base, the base includes a receiving channel connected to the lower end of the receiving groove and a movable channel for allowing a push rod to move, the inner diameter of the movable channel is larger than the inner diameter of the receiving channel, a pad is arranged at the bottom of the movable channel, a spring for driving the push rod to move upward is arranged between the pad and the upper end of the inner wall of the movable channel, and a limiting block is arranged at the lower end of the push rod.

[0015] By adopting the above technical solution, the washer is passed through the bolt, and the washer and the bolt are placed in the mold core. The stamping mechanism presses the bolt from top to bottom, so that the inner diameter of the washer is reduced and deformed, and it is firmly attached to the bottom wall of the nut. When the stamping mechanism leaves the mold, the spring drives the push rod to move up to eject the bolt. The operation is simple, the processing is convenient, the stability is high, the cost is low, and the efficiency is high.

[0016] The embodiments describe the specific implementation of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a cross-sectional view of the airtight bolt according to an embodiment of the utility model.

[0018] Figure 2 for Figure 1 Enlarged view of part A.

[0019] Figure 3 It is a cross-sectional view of a processing device according to an embodiment of the utility model.

[0020] Figure 4 It is a cross-sectional view of the mold core of an embodiment of the utility model.

[0021] Figure numerals: 1. nut, 2. screw, 21. threaded section, 22. smooth section, 3. gasket, 31. airtight ring, 4. mold, 5. base, 51. accommodating channel, 52. movable channel, 6. mold core, 61. accommodating groove, 62. molding groove, 621. molding protrusion, 7. cushion block, 8. spring, 9. ejector rod, 91. limit block. DETAILED DESCRIPTION

[0022] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

[0023] See attached Figure 1-2 A gas-tight bolt comprises a nut 1 and a screw rod 2, wherein the screw rod 2 is provided with a threaded section 21 and a smooth section 22, wherein the smooth section 22 is arranged at one end of the screw rod 2 corresponding to the nut 1, and a washer 3 is movably sleeved on the smooth section 22, wherein the inner diameter of the washer 3 is provided with an airtight ring portion 31, wherein the inner diameter of the washer 3 is larger than the outer diameter of the threaded section 21, and the inner diameter of the airtight ring portion 31 is smaller than the outer diameter of the threaded section 21.

[0024] This embodiment further provides that: the distance between the inner diameter of the airtight ring portion 31 and the smooth section 22 is n, 0.2 mm≤n≤0.3 mm.

[0025] This embodiment further provides that: the height difference between the airtight ring portion 31 and the gasket 3 is h, 0.4mm≤h≤0.5mm.

[0026] This embodiment further provides that: the airtight ring portion 31 is formed by riveting the inner diameter of the gasket 3 to form a small deformation through compression.

[0027] This embodiment further provides that: the screw 2 is provided with a Magnetic coating on the outside.

[0028] See attached Figure 3-4, a processing device for processing airtight bolts, comprising a mold 4 and a stamping mechanism, the mold 4 comprising a base 5 and a mold core 6, the mold core 6 being arranged on the base 5, the mold core 6 comprising a receiving groove 61 adapted to the screw rod 2 and a forming groove 62 for receiving the gasket 3, the receiving groove 61 being arranged with upper and lower openings, the forming groove 62 corresponding to the opening of the receiving groove 61 being surrounded by a forming convex portion 621 for riveting and deforming the gasket 3, a hollow setting being arranged in the base 5, the base 5 comprising a receiving channel 51 connected to the lower end of the receiving groove 61 and a movable channel 52 for allowing a push rod 9 to move, the inner diameter of the movable channel 52 being larger than the inner diameter of the receiving channel 51, a cushion block 7 being arranged at the bottom of the movable channel 52, a spring 8 for driving the push rod 9 to move upward being arranged between the cushion block 7 and the upper end of the inner wall of the movable channel 52, a limiting block 91 being arranged at the lower end of the push rod 9.

[0029] In the technical solution of the utility model, the punching device cooperates with the mold 4 through stroke control and pressure control to make the gasket undergo riveting and deformation when assembled with the bolt. Through numerical control, the stability is higher and the molding quality is high.

[0030] In the description of the present invention, it should be noted that the terms "upper" and "lower" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present invention. The above-mentioned "between" does not only refer to positions or positions, but also includes the meaning of the interaction between different parts.

[0031] Although the following terms are frequently used in this article: nut 1, screw 2, threaded section 21, smooth section 22, washer 3, airtight ring 31, mold 4, base 5, accommodating channel 51, movable channel 52, mold core 6, accommodating groove 61, forming groove 62, forming convex portion 621, cushion block 7, spring 8, ejector 9, limit block 91, etc., the possibility of using other terms is not excluded. The use of these terms is only for the purpose of more conveniently describing and explaining the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

Claims

1. An airtight bolt, comprising a nut and a screw, characterized in that: The screw is provided with a threaded section and a smooth section, the smooth section is arranged at one end of the screw corresponding to the nut, a washer is movably sleeved on the smooth section, an airtight ring portion is arranged on the inner diameter of the washer, the inner diameter of the washer is larger than the outer diameter of the threaded section, and the inner diameter of the airtight ring portion is smaller than the outer diameter of the threaded section.

2. The airtight bolt according to claim 1, characterized in that: The distance between the inner diameter of the airtight ring portion and the smooth section is n, 0.2 mm≤n≤0.3 mm.

3. The airtight bolt according to claim 1, characterized in that: The height difference between the airtight ring and the gasket is h, 0.4mm≤h≤0.5mm.

4. The airtight bolt according to claim 1, characterized in that: The airtight ring portion is formed by riveting and compressing the inner diameter of the gasket to form a small deformation.

5. The airtight bolt according to claim 1, characterized in that: The screw rod is provided with a Magneli coating on the outside.

6. A processing device for processing airtight bolts, characterized in that: It includes a mold and a stamping mechanism, which is arranged above the mold. The mold includes a base and a mold core, which is arranged on the base. The mold core includes a receiving groove adapted to the screw and a forming groove for receiving a gasket. The receiving groove is provided with upper and lower openings, and a forming convex portion for riveting and deforming the gasket is arranged around the opening of the forming groove corresponding to the receiving groove. A hollow setting is arranged in the base, and the base includes a receiving channel connected to the lower end of the receiving groove and a movable channel for the push rod to move. The inner diameter of the movable channel is larger than the inner diameter of the receiving channel. A cushion block is arranged at the bottom of the movable channel, and a spring for driving the push rod to move upward is arranged between the cushion block and the upper end of the inner wall of the movable channel, and a limiting block is arranged at the lower end of the push rod.

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