Anti-loosening screw fastening structure easy to manufacture in batch

Abstract

The utility model discloses an anti-loosening screw fastening structure easy to manufacture in batches, a plate and a seat are locked through a screw, and the screw comprises a screw head and a screw rod; the top surface of the plate is provided with a round countersink, the bottom of the round countersink is provided with a threaded through hole, and the top surface of the seat is provided with a threaded countersink; an elastic special-shaped gasket is pressed between the bottom surface of the screw head and the bottom surface of the round countersink, and a plurality of anti-skid teeth are rotationally and symmetrically distributed on the bottom surface of the screw head; a positioning groove is formed in the wall face of the round countersunk opening, and a positioning block is arranged on the outer ring of the elastic special-shaped gasket. The elastic special-shaped gasket is a second special-shaped gasket, at least one radial slot is formed in the circumferential face of the second special-shaped gasket in the radial direction of the gasket, and a circumferential slot is formed in the side, in the circumferential direction of the gasket, of the radial slot from the bottom, relatively close to the circle center of the gasket, of the radial slot. Strip-shaped parts separated by L-shaped open seams formed by the radial open seams and the circumferential open seams form elastic warped pieces; the second special-shaped gasket is formed through one-time punch forming of an equal-thickness plate. The cost is low.

Description

Technical Field

[0001] The utility model belongs to the technical field of fasteners and relates to an anti-loosening screw fastening structure which is easy to manufacture in batches. Background Technique

[0002] Screw fastening structures are widely used in various fields and are usually used to lock and connect a plate member and a seat member, such as locking and connecting the cylinder head and cylinder block of an automobile engine. For application scenarios such as automobile engines with a large quantity and high requirements, on the premise of meeting the rigid technical requirements of anti-loosening fastening, the manufacturing cost of the screw fastening structure also needs to be considered.

[0003] The screw fastening structure of the traditional technology, referring to Figure 1 、 Figure 2 , its general structure is that the plate member 1 and the seat member 5 are locked by a screw. The screw includes a screw head 7 and a screw rod 4; a round counterbore 6 is arranged on the top surface of the plate member 1, and a threaded through hole 11 is arranged at the bottom of the round counterbore 6; a threaded counterbore 10 is arranged on the top surface of the seat member 5; the lower part of the screw rod 4 passes through the threaded through hole 11 and is screwed with the threaded counterbore 10, and a C-shaped spring washer is pressed between the bottom surface of the screw head 7 and the bottom surface of the round counterbore 6.

[0004] The screw fastening structure of the traditional technology can of course be used for fastening in ordinary occasions, but in application occasions with frequent vibration, large vibration and high reliability requirements, such as the sealed connection between the cylinder head and cylinder block of a vehicle engine, it often leaks oil due to the loosening of the screw fastening structure after running for a period of time, and the reliability of the sealed connection is not high enough. It is often necessary to check and maintain to ensure the running efficiency and driving safety of the vehicle. Therefore, various anti-loosening screw fastening structures have been developed.

[0005] For example: in the technical solution of the patent application with the application number 2023232594313 and the name of "an improved anti-loosening screw fastening structure" previously applied by the inventor of this case, its structure is as Figures 1 to 4As shown in the figure, there is an improved anti-loosening screw fastening structure. The plate member 1 and the seat member 5 are locked by screws. The screw includes a screw head 7 and a screw rod 4. A circular counterbore 6 is provided on the top surface of the plate member 1, and a threaded through hole 11 is provided at the bottom of the circular counterbore 6. A threaded counterbore 10 is provided on the top surface of the seat member 5. The lower part of the screw rod 4 passes through the threaded through hole 11 and is screwed with the threaded counterbore 10. An elastic special-shaped gasket is pressed between the bottom surface of the screw head 7 and the bottom surface of the circular counterbore 6. A plurality of anti-slip teeth 9 are symmetrically distributed in a rotational manner on the bottom surface of the screw head 7. A positioning groove 8 is formed on the wall surface of the circular counterbore 6, and a positioning block 2 adapted to the positioning groove 8 is provided on the outer ring of the elastic special-shaped gasket. The elastic special-shaped gasket is a type A special-shaped gasket 3A with an overall contour of a ring body. A radial slit 14 is provided in the middle part of the type A special-shaped gasket 3A, and the ring part corresponding to the radial slit 14 area is divided into an upper ring part and a lower ring part. The lower ring part is a reserved connecting part 15. A notch is provided in the middle of the upper ring part to divide the upper ring part. The upper ring part is circumferentially divided into three arc segments. The two thin segments near the notch are respectively a segment A 12a and a segment B 12b, and the third segment is a thick segment not divided by the radial slit 14. At least one row of protruding type A locking teeth 13a adapted to the anti-slip teeth 9 is provided near the notch on the top surface of the segment A 12a. At least one row of type B locking teeth 13b adapted to the anti-slip teeth 9 is provided near the notch on the top surface of the segment B 12b. The tooth height of the type A locking teeth 13a is less than or equal to the width of the radial slit 14. The tooth height of the type B locking teeth 13b is less than or equal to the width of the radial slit 14.

[0006] The anti-loosening screw fastening structure adopting such technology can of course be used normally in various vibration application occasions, but there are the following deficiencies:

[0007] Since the structure of its type A special-shaped gasket 3A is relatively complex, although it can be completely processed, due to the unequal thickness of its various parts, it is difficult to be formed at one time by using an equal-thickness plate with a traditional continuous stamping process in a flowing water manner, and the production cost is relatively high, and the use effect is not ideal enough. Utility Model Content

[0008] To overcome the deficiencies of the prior art, the present utility model provides an anti-loosening screw fastening structure that is easy to manufacture in batches.

[0009] The technical solution adopted by the present utility model to achieve the above technical purposes is as follows: An anti-loosening screw fastening structure that is easy to manufacture in batches. The plate member and the seat member are locked by screws. The screw includes a screw head and a screw rod. A round countersunk opening is provided on the top surface of the plate member, and a threaded through hole is provided at the bottom of the round countersunk opening. A threaded countersunk opening is provided on the top surface of the seat member. The lower part of the screw rod passes through the threaded through hole and is screwed with the threaded countersunk opening. An elastic special-shaped gasket is pressed between the bottom surface of the screw head and the bottom surface of the round countersunk opening. A plurality of anti-slip teeth are rotationally symmetrically distributed on the bottom surface of the screw head. A positioning groove is provided on the wall surface of the round countersunk opening, and a positioning block adapted to the positioning groove is provided on the outer ring of the elastic special-shaped gasket. The elastic special-shaped gasket is a type-B special-shaped gasket. Along the radial direction of the gasket, not less than one radial slit is provided on the peripheral surface of the type-B special-shaped gasket. Starting from the bottom relatively close to the center of the gasket of the radial slit, a circumferential slit is provided along one side of the circumferential direction of the gasket. The strip-shaped part separated by the L-shaped slit formed by the radial slit and the circumferential slit constitutes an elastic fin, and the elastic fin is obliquely turned up towards the same surface direction of the type-B special-shaped gasket. The type-B special-shaped gasket is formed by one-time stamping of a plate member with equal thickness.

[0010] Four L-shaped slits are provided, and the four corresponding elastic fins are rotationally symmetrically arranged along the central axis of the type-B special-shaped gasket.

[0011] The plate member with equal thickness is a steel coil plate.

[0012] The beneficial effects of the present utility model are as follows:

[0013] Since its elastic special-shaped gasket is a type-B special-shaped gasket 3B, along the radial direction of the gasket, not less than one radial slit J is provided on the peripheral surface of the type-B special-shaped gasket 3B. Starting from the bottom relatively close to the center of the gasket of the radial slit J, a circumferential slit Z is provided along one side of the circumferential direction of the gasket. The strip-shaped part separated by the L-shaped slit formed by the radial slit J and the circumferential slit Z constitutes an elastic fin C, and the elastic fin C is obliquely turned up towards the same surface direction of the type-B special-shaped gasket 3B. The type-B special-shaped gasket 3B is formed by one-time stamping of a plate member with equal thickness, which is easier to process, has lower cost, and better use effect compared with the structure adopted in the prior art. Description of the Drawings

[0014] The following further illustrates the present utility model in conjunction with the drawings and embodiments. Among them:

[0015] Figure 1 is a schematic diagram of the anti-loosening screw fastening structure of the prior art;

[0016] Figure 2 is an exploded schematic diagram of the anti-loosening screw fastening structure of the prior art;

[0017] Figure 3 is a schematic diagram of the part of the type-A special-shaped gasket in the prior art;

[0018] Figure 4 is a schematic diagram of another viewing direction of part of the A-shaped gasket in the prior art;

[0019] Figure 5 is a schematic diagram of the present utility model;

[0020] Figure 6 is an exploded schematic diagram of the present utility model;

[0021] Figure 7 is a schematic diagram of part of the B-shaped gasket in the present utility model;

[0022] Figure 8 is a schematic diagram of another viewing direction of part of the B-shaped gasket in the present utility model.

[0023] The reference numerals in the drawings are explained as follows: plate member 1, positioning block 2, A-shaped gasket 3A, B-shaped gasket 3B, screw rod 4, seat member 5, circular sunk opening 6, screw head 7, positioning groove 8, anti-slip teeth 9, threaded sunk opening 10, threaded through hole 11, A section 12a, B section 12b, A clamping teeth 13a, B clamping teeth 13b, radial slit 14, remaining connecting portion 15, elastic flap C, radial slit J, circumferential slit Z Detailed implementation manners

[0024] In an embodiment of the present utility model, as Figures 5 to 8 shown, an anti-loosening screw fastening structure that is easy to manufacture in batches, the plate member 1 and the seat member 5 are locked by screws, and the screws include a screw head 7 and a screw rod 4; a circular sunk opening 6 is provided on the top surface of the plate member 1, a threaded through hole 11 is provided at the bottom of the circular sunk opening 6, and a threaded sunk opening 10 is provided on the top surface of the seat member 5; the lower part of the screw rod 4 passes through the threaded through hole 11 and is screwed with the threaded sunk 10, and an elastic special-shaped gasket is pressed between the bottom surface of the screw head 7 and the bottom surface of the circular sunk opening 6, and a plurality of anti-slip teeth 9 are symmetrically distributed in a rotational manner on the bottom surface of the screw head 7; a positioning groove 8 is provided on the wall surface of the circular sunk opening 6, and a positioning block 2 adapted to the positioning groove 8 is provided on the outer ring of the elastic special-shaped gasket; the elastic special-shaped gasket is the B-shaped gasket 3B, and at least one radial slit J is provided along the radial direction of the circumference of the B-shaped gasket 3B, and a circumferential slit Z is provided along one side of the circumference of the gasket starting from the bottom relatively close to the center of the gasket at the bottom of the radial slit J, and the strip-shaped portion separated by the L-shaped slit formed by the radial slit J and the circumferential slit Z constitutes an elastic flap C, and the elastic flap C is obliquely turned up towards the same surface direction of the B-shaped gasket 3B; the B-shaped gasket 3B is formed by stamping a plate member with equal thickness at one time.

[0025] Four L-shaped slits are provided, and the four corresponding elastic flaps C are symmetrically distributed in a rotational manner along the central axis of the B-shaped gasket 3B.

[0026] The plate member with equal thickness is a steel coil plate.

[0027] Further description of the present utility model:

[0028] For the production of the screw described in the present utility model, since the anti-slip teeth 9 need to be stamped out simultaneously, the mold has to be correspondingly changed, and the rest of the process is the same as that of the traditional screw production process.

[0029] For the production of the special-shaped washer 3B of type B described in the present utility model, with a steel coil plate as the raw material, it is continuously produced on a stamping production line. When designing the mold, a combined mold can be used to form the punching and bending shapes in one step.

[0030] The produced screws and the special-shaped washers 3B of type B can be batch heat-treated.

Claims

1. An anti-loosening screw fastening structure that is easy to mass-produce, wherein the plate and the seat are locked by screws, and the screws include a screw head and a screw rod; a round countersunk is provided on the top surface of the plate, a threaded through hole is provided at the bottom of the round countersunk, and a threaded countersunk is provided on the top surface of the seat; the lower part of the screw rod is screwed through the threaded through hole and then screwed with the threaded countersunk, an elastic special-shaped gasket is pressed between the bottom surface of the screw head and the bottom surface of the round countersunk, and a plurality of anti-slip teeth are provided on the bottom surface of the screw head in rotationally symmetrical distribution; a positioning groove is provided on the wall surface of the round countersunk, and a positioning block matching the positioning groove is provided on the outer ring of the elastic special-shaped gasket; the characteristics are: The elastic special-shaped gasket is a special-shaped gasket of type B. The circumferential surface of the special-shaped gasket of type B is provided with at least one radial slit in the radial direction of the gasket. A circumferential slit is provided along one side of the circumference of the gasket starting from the bottom of the radial slit relatively close to the center of the gasket. The strip portion separated by the L-shaped slit formed by the radial slit and the circumferential slit constitutes an elastic flap, and the elastic flap is obliquely turned up toward the same side of the special-shaped gasket of type B. The special-shaped gasket of type B is formed by one-time stamping of a plate of equal thickness.

2. The anti-loosening screw fastening structure that is easy to mass-produce according to claim 1 is characterized in that: The L-shaped slits are provided with four paths, and the four corresponding elastic flaps are arranged rotationally symmetrically along the central axis of the special-shaped gasket.

3. The anti-loosening screw fastening structure that is easy to mass-produce according to claim 2 is characterized in that: The plate parts of equal thickness are steel coils.

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