Self-tightening anti-loosening screw fastening structure

Abstract

A self-tightening anti-loosening screw fastening structure is characterized in that a plate and a seat are locked through screws, a round countersink is formed in the top surface of the plate, a threaded through hole is formed in the bottom of the round countersink, and a threaded countersink is formed in the top surface of the seat; the lower portion of the screw rod penetrates through the threaded through hole to be connected with the threaded countersink in a screwed mode, a gasket is arranged between the screw head and the round countersink, and a clamping structure is arranged on the bottom face of the screw head. A plurality of radial slots are formed in the gasket, a circumferential slot is formed in at least one side with the bottom of each radial slot as the starting point, strip-shaped parts separated by the radial slots and the circumferential slots form warped pieces, and the warped pieces on the corresponding side are rotationally and symmetrically distributed; the round countersunk opening is free of grooving; at least one spiral gentle slope surface is arranged on the bottom surface of the screw head close to the peripheral edge part; when the gasket is flattened, the outline of the outer ring surface is completely circular; when the screw is unscrewed, the outer end of at least one fin relatively displaces towards the slope top direction of the gentle slope surface and is further pressed down by the gentle slope surface; a limiting protruding ring is arranged on the bottom face of the screw head. Reliability is high, replacement is easy, and application cost is low.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of fastener, and relates to a self-tightening anti-loose screw fastening structure. BACKGROUND

[0002] Screw fastening structure is widely used in various fields, and is usually used for locking and connecting plate members and seat members, such as locking and connecting the cylinder cover and the cylinder body of the automobile engine. For such a large and high-demand application scenario as the automobile engine, the application cost of the screw fastening structure needs to be considered under the premise of meeting the hard technical requirements of anti-loose fastening.

[0003] The screw fastening structure of the conventional technology can be used for fastening in ordinary occasions, but in application occasions with frequent vibration and high reliability requirements, such as the sealing connection between the cylinder cover and the cylinder body of the vehicle engine, oil leakage often occurs due to the loosening of the screw fastening structure after a period of operation, and the reliability of the sealing connection is not high enough, so it is often necessary to check and maintain to ensure the operation efficiency and driving safety of the vehicle. Therefore, people have developed various anti-loose screw fastening structures.

[0004] For example, the prior application of the present applicant, patent application No. 202421893926.3, entitled "Anti-loose screw fastening structure easy to mass-produce", the structure is as shown in Figures 1 to 4 A kind of anti-loose screw fastening structure easy to mass-produce, plate member 5 and seat member 4 are locked by screw, screw includes screw head 8A and nail rod 2a;Plate member 5 top surface is provided with round sink 7, and the bottom of round sink 7 is provided with threaded hole 10, and the top surface of seat member 4 is provided with threaded sink 3;Nail rod 2a lower part is rotated through threaded hole 10 and is connected with threaded sink 3, and the bottom surface of screw head 8A is provided with elastic special-shaped gasket between the bottom surface of round sink 7, and the bottom surface of screw head 8A is provided with a plurality of anti-skid teeth 11 which are distributed and arranged in rotational symmetry;Positioning groove 6 is formed on the wall surface of round sink 7 along the axial direction, and the outer ring of elastic special-shaped gasket is provided with positioning block 9 which is matched with positioning groove 6;The elastic special-shaped gasket is A gasket 1a, and at least one radial slit J is formed on the circumferential surface of A gasket 1a along the radial direction of the gasket, and a circumferential slit Z is formed on one side of the circumferential surface of the gasket along the circumferential direction from the bottom of the radial slit J close to the center of the gasket, and the L-shaped slit formed by the radial slit J and the circumferential slit Z is divided into a strip-shaped part, which constitutes an elastic flap K, and the elastic flap K is inclined and turned up in the same direction of A gasket 1a.

[0005] The L-shaped slit is provided with four slits, and the four corresponding elastic flaps K are arranged in rotational symmetry along the central axis of A gasket 1a.

[0006] The equal-thickness plate member is a steel coil plate.

[0007] The anti-loose screw fastening structure using such technology can of course be normally used in various vibration application occasions, but has the following disadvantages:

[0008] A. Since its anti-loose principle is to prevent angular displacement between the nut plate 1a and the nut rod 2a by matching the positioning groove 6 provided on the axial hole wall of the round sink 7 with the positioning block 9 on the nut plate 1a, and then preventing angular displacement between the nut head 8A and the plate 5 by the elastic tab K on the nut plate 1a clamping the anti-slip teeth 11 on the bottom surface of the nut head 8A, once the original clamping position between the elastic tab K and the anti-slip teeth 11 is loosened, the loosening will be further aggravated, since there is no self-tightening function, the angular displacement between the nut head 8A and the plate 5 will be further loosened, and the reliability is not high enough;

[0009] B. Since the positioning groove 6 needs to be provided on the axial hole wall of the round sink 7, the application cost is increased, it is relatively not easy to directly replace and promote, and the reliability will be affected to a certain extent;

[0010] In summary, the reliability of the prior art is not high enough, the application cost is relatively high, it is relatively not easy to directly replace and promote, and the use effect is not ideal enough. Practical new type content

[0011] In order to overcome the shortcomings of the prior art, the utility model provides a self-tightening anti-loose screw fastening structure which has higher reliability, relatively lower application cost, and is relatively easier to directly replace and promote.

[0012] The utility model discloses a technical scheme that is adopted to achieve the above technical purpose is: a self-tightening anti-loose screw fastening structure, and the plate member is locked with the seat member through a screw, and the screw comprises a screw head and a nail rod, the top surface of the plate member is provided with a round sink, the bottom of the round sink is provided with a threaded through hole, and the top surface of the seat member is provided with a threaded sink, the lower part of the nail rod is screwed through the threaded through hole and is screwed with the threaded sink, a circular ring-shaped special-shaped gasket that is formed by one-time punch forming of the plate member with equal thickness is arranged between the bottom surface of the screw head and the bottom surface of the round sink, and the bottom surface of the screw head is provided with a clamping structure and is clamped with the gasket, a plurality of radial slits with a slit length less than the width of the ring part of the gasket are formed on the circumferential surface of the gasket along the radial direction of the gasket, a circumferential slit is formed along the circumferential direction of the gasket from the bottom of the radial slit, the corresponding L-shaped slit formed by the radial slit and the circumferential slit on the corresponding side is used to divide the corresponding strip part on the gasket body, and the corresponding strip part on the corresponding side is used to form a flap, the flap on the corresponding side is inclined and turned up in the same direction of the gasket at an acute angle, and the flaps on the corresponding side are distributed in a rotational symmetry mode with the center of the gasket as the axis, the round sink is an axial groove-free round sink of the sink wall surface, the clamping structure is a spiral gentle slope surface on the bottom surface of the screw head, the outer ring surface contour of the gasket is a complete circle when the gasket is completely flattened, when the screw is loosened, the outer end of at least one flap is relatively displaced towards the top of the corresponding gentle slope surface and is further pressed down by the gentle slope surface, and the bottom surface of the screw head near the central axis part is provided with a limiting convex ring that is higher than all the slope surfaces.

[0013] The screw head is a beta screw head, a plurality of gentle slope surfaces are rotationally symmetrically arranged on the bottom surface of the beta screw head near the outer peripheral edge, and the terminal top of each gentle slope surface and the initial bottom of the adjacent gentle slope surface are integrally connected through a transition steep slope surface.

[0014] The screw head is a gamma screw head, and one twisted circular ring-shaped gentle slope surface is arranged on the bottom surface of the gamma screw head near the outer peripheral edge, and the slope surface of the ring-shaped gentle slope surface is half a circle in height and half a circle in drop and is closed at the head and tail.

[0015] The nail rod is an alpha nail rod, and the rod body of the alpha nail rod is an equal-diameter screw rod structure.

[0016] The nail rod is a beta nail rod, and the bottom end of the beta nail rod is a self-tapping screw structure.

[0017] The gasket is a beta gasket, a plurality of radial slits with a slit length less than the width of the gasket ring are formed on the circumference of the beta gasket along the radial direction of the gasket, a circumferential slit is formed on one side of the gasket along the circumferential direction of the gasket from the bottom of the radial slit, the L-shaped slit formed by the radial slit and the circumferential slit is divided into a strip on the gasket body, and the strip forms a beta tab; the L-shaped slit formed by the radial slit and the circumferential slit on the other side of the gasket forms an alpha tab; the alpha tab is obliquely turned up at an acute angle towards one side of the gasket; and the beta tab is obliquely turned up at an acute angle towards the other side of the gasket.

[0018] The gasket is a beta gasket, a plurality of radial slits with a slit length less than the width of the gasket ring are formed on the circumference of the beta gasket along the radial direction of the gasket, a circumferential slit is formed on one side of the gasket along the circumferential direction of the gasket from the bottom of the radial slit, the L-shaped slit formed by the radial slit and the circumferential slit is divided into a strip on the gasket body, and the strip forms a beta tab; the L-shaped slit formed by the radial slit and the circumferential slit on the other side of the gasket forms an alpha tab; the alpha tab is obliquely turned up at an acute angle towards one side of the gasket; and the beta tab is obliquely turned up at an acute angle towards the other side of the gasket.

[0019] The utility model discloses the beneficial effect is:

[0020] Due to the above technical scheme, the structure has a self-tightening type anti-loosening force feedback mechanism that increases the friction force to prevent further loosening, thereby realizing self-tightening type anti-loosening, and the reliability of anti-loosening is higher; the positioning groove 6 does not need to be formed on the round sink 7, which is easier to directly replace and promote, the application cost is relatively lower, and the use effect is more ideal. BRIEF DESCRIPTION OF DRAWINGS

[0021] The utility model will be further described below in combination with the drawings and examples. Among them:

[0022] Figure 1 It is the schematic diagram of prior art anti-loosening screw fastening structure;

[0023] Figure 2 It is the split schematic diagram of prior art anti-loosening screw fastening structure;

[0024] Figure 3 It is the schematic diagram of the alpha gasket 1a part in prior art;

[0025] Figure 4 It is the schematic diagram of the alpha gasket 1a part in prior art;

[0026] Figure 5 It is the schematic diagram of the utility model;

[0027] Figure 6 It is the split schematic diagram of the utility model;

[0028] Figure 7 is the schematic view of the part of the second gasket 1b in the utility model;

[0029] Figure 8 is the schematic view of the part of the second gasket 1b in the utility model;

[0030] Figure 9 is the schematic view of the part of the second gasket 1b in the utility model;

[0031] Figure 10 is the schematic view of the part of the second gasket 1b in the utility model;

[0032] Figure 11 is the schematic view of the part of the second gasket 1b in the utility model;

[0033] Figure 12 is the schematic view of the part of the second gasket 1b in the utility model;

[0034] Figure 13 is the schematic view of the part of the second gasket 1b in the utility model;

[0035] Figure 14 is the schematic view of the part of the second gasket 1b in the utility model;

[0036] Figure 15 is the schematic view of the part of the second gasket 1b in the utility model;

[0037] Figure 16 is the cover of the sample performance detection report related to the utility model;

[0038] Figure 17 is the first page of the sample performance detection report related to the utility model;

[0039] Figure 18 is the second page of the sample performance detection report related to the utility model;

[0040] Figure 19 is the third page of the sample performance detection report related to the utility model.

[0041] The mark number in the drawing is explained as follows: the first gasket 1a, the second gasket 1b, the third gasket 1c, the first nail rod 2a, the second nail rod 2b, the threaded sink 3, the seat piece 4, the plate piece 5, the positioning groove 6, the round sink 7, the first screw head 8A, the second screw head 8B, the third screw head 8C, the positioning block 9, the threaded through hole 10, the anti-skid tooth 11, the limiting convex ring 12, the elastic flake K, the first flake K1, the second flake K2, the radial slit J, the circumferential slit Z, the first circumferential slit Z1, the second circumferential slit Z2, the gentle slope surface P, the steep slope surface T DETAILED DESCRIPTION

[0042] The utility model discloses an embodiment, such as Figures 5 to 15 As shown in the figure, a self-tightening anti-loose screw fastening structure, the plate 5 is locked with the seat 4 through a screw, and the screw comprises a screw head and a nail rod; the top surface of the plate 5 is provided with a round sink 7, the bottom of the round sink 7 is provided with a threaded hole 10, and the top surface of the seat 4 is provided with a threaded sink 3; the lower part of the nail rod is screwed through the threaded hole 10 and is screwed with the threaded sink 3, a circular ring-shaped special-shaped gasket formed by one-time stamping of the plate with equal thickness is arranged between the bottom surface of the screw head and the bottom surface of the round sink 7, the bottom surface of the screw head is provided with a clamping structure and is clamped with the gasket; a plurality of radial slits J with a slit length less than the width of the ring part of the gasket are formed on the circumferential surface of the gasket along the radial direction of the gasket, a circumferential slit Z is formed along the circumferential direction of the gasket from the bottom of the radial slit J, and the corresponding L-shaped slit formed by the radial slit J and the corresponding circumferential slit Z on the gasket body is divided into a corresponding strip-shaped part, which forms a flap on the corresponding side, the flap on the corresponding side is obliquely turned up at an acute angle in the same surface direction of the gasket, and the flaps on the corresponding sides are rotationally symmetrically distributed with the center of the gasket as the axis; the round sink 7 is an axial slot-free round sink 7 of a sink wall surface; the clamping structure is a disc spiral gentle slope surface P arranged on the bottom surface of the screw head and close to the outer circumferential edge; the outer ring surface profile of the gasket when being completely flattened is a complete circle; when the screw is loosened, the outer end of at least one flap is relatively displaced towards the top of the corresponding gentle slope surface P and is further pressed down by the gentle slope surface P; the bottom surface of the screw head close to the central axis is provided with a limiting convex ring 12 higher than all the slope surfaces.

[0043] The screw head is an ethyl screw head 8B, a plurality of gentle slope surfaces P are rotationally symmetrically arranged on the bottom surface of the ethyl screw head 8B and close to the outer circumferential edge, and the terminal top of each gentle slope surface P and the initial bottom of the adjacent gentle slope surface P are integrally connected through a transition steep slope surface T.

[0044] The screw head is a propyl screw head 8C, and one twisted circular ring-shaped gentle slope surface P is arranged on the bottom surface of the propyl screw head 8C and close to the outer circumferential edge, and the slope surface of the circular ring-shaped gentle slope surface P is half a circle raised and half a circle lowered and closed at the head and tail.

[0045] The nail rod is an alpha nail rod 2a, and the rod body of the alpha nail rod 2a is an equal-diameter screw rod structure.

[0046] The nail rod is a beta nail rod 2b, and the bottom end of the beta nail rod 2b is a self-tapping screw structure.

[0047] The gasket is the gasket 1b, a plurality of radial slits J with a slit length less than the width of the gasket ring are formed on the circumference of the gasket 1b along the radial direction of the gasket, a circumferential slit Z is formed on one side of the gasket along the circumferential direction of the gasket from the bottom of the radial slit J, one side is the alpha circumferential slit Z1, and the other side is the beta circumferential slit Z2; the L-shaped slit formed by the radial slit J and the alpha circumferential slit Z1 separates an alpha tab K1 on the gasket body; the L-shaped slit formed by the radial slit J and the beta circumferential slit Z2 separates a beta tab K2 on the gasket body; the alpha tab K1 is obliquely turned up at an acute angle towards one side of the gasket; the beta tab K2 is obliquely turned up at an acute angle towards the other side of the gasket; and the tabs on the corresponding sides are respectively distributed in rotational symmetry with the center of the gasket as the axis.

[0048] The gasket is the gasket 1b, a plurality of radial slits J with a slit length less than the width of the gasket ring are formed on the circumference of the gasket 1b along the radial direction of the gasket, a circumferential slit Z is formed on one side of the gasket along the circumferential direction of the gasket from the bottom of the radial slit J, one side is the alpha circumferential slit Z1, and the other side is the beta circumferential slit Z2; the L-shaped slit formed by the radial slit J and the alpha circumferential slit Z1 separates an alpha tab K1 on the gasket body; the L-shaped slit formed by the radial slit J and the beta circumferential slit Z2 separates a beta tab K2 on the gasket body; the alpha tab K1 is obliquely turned up at an acute angle towards one side of the gasket; the beta tab K2 is obliquely turned up at an acute angle towards the other side of the gasket; and the tabs on the corresponding sides are respectively distributed in rotational symmetry with the center of the gasket as the axis.

[0049] When the utility model is implemented, the screw used can be the following four types:

[0050] A, the combination of the alpha screw head 8B and the alpha nail rod 2a;

[0051] B, the combination of the beta screw head 8B and the beta nail rod 2b;

[0052] C, the combination of the gamma screw head 8C and the alpha nail rod 2a;

[0053] D, the combination of the gamma screw head 8C and the beta nail rod 2b;

[0054] The gasket used can be the beta gasket 1b or the gamma gasket 1c used in the four types of screws respectively.

[0055] The utility model uses different combinations of the screw head, the nail rod and the gasket, and there are eight combined application forms.

[0056] Further description of the utility model:

[0057] A, The utility model discloses a self-tightening anti-loosening action principle is: when using, the whole face of the bottom surface of the gasket is pressure bonded with the plane of the bottom surface periphery of round sink 7, the middle part of the top surface of the gasket is pressed tightly by the limiting convex ring 12 on the bottom surface of the screw head, but the elastic flaps K area of the outer circle of the top surface of the gasket is only pressure bonded with the gentle slope surface P point line elasticity of the bottom surface of the screw head, so the pressure bonding area of the bottom surface of the gasket is larger, and the friction force received is also larger, when loosening, the screw and the gasket will loosen first, so the gasket will not rotate with the screw at this time. When the screw starts to loosen slightly, at least one elastic flap K (or the flap K1 or the flap K2) will be further pressed tightly along the corresponding gentle slope surface P, and the elastic force is increased, so the friction force between the screw head and the gasket is automatically increased, the further loosening of the screw is prevented, a self-tightening anti-loosening feedback mechanism is formed, and the self-tightening anti-loosening is realized. Once the initial clamping between the elastic flap K and the anti-skid tooth 11 of the traditional anti-loosening structure starts to loosen, it will "collapse".

[0058] B, The limiting convex ring 12 is arranged, and the action is: preventing the elastic flap from losing elasticity due to being pressed too tightly by the screw head for a long time, causing the feedback mechanism to fail, and limiting the pressure bonding distance of the elastic flap on the screw head and the gasket.

[0059] C, The gasket 1b is arranged to be universal on two sides, one purpose is: when manually operating, it is a kind of "anti-fool design", and when automatically installing the mechanism, the positioning unit mechanism of the automatic installation mechanism can be simplified.

[0060] D, In the utility model, the screw head 8B structure can be used in high requirement application scenarios, and the screw head 8C structure can be used in relatively low requirement application scenarios.

[0061] E, The gasket 1b has better elasticity, and can be used in relatively high requirement application scenarios, and the gasket 1c can be used in relatively low requirement application scenarios.

[0062] F, The sample related to the utility model has been detected by the national authoritative detection department, and is intentionally detected with a higher requirement than the related standard. After butter is added, the detection result still reaches Figures 16 to 19 98.9% of the residual / initial value.

[0063] G, The production of the screw in the utility model needs to punch the clamping structure on the bottom surface of the screw head at the same time, and the die needs to be changed accordingly, and the rest of the process is the same as the traditional screw production process. In the production of the gasket in the utility model, the steel coil plate with good elasticity is used as raw material, and the die is designed to adopt corresponding combined die to realize one-step forming of punching, bending and molding. The produced screws and gaskets can be heat treated in batches.

Claims

1. A self-tightening anti-loose screw fastening structure, a plate member and a seat member are locked by a screw, the screw comprises a screw head and a screw shank; the top surface of the plate member is provided with a circular counterbore, the bottom of the circular counterbore is provided with a threaded through hole, the top surface of the seat member is provided with a threaded counterbore; the lower part of the screw shank is screwed through the threaded through hole and is screwed with the threaded counterbore, the bottom surface of the screw head and the bottom surface of the circular counterbore are provided with a circular ring-shaped special-shaped gasket formed by one-time stamping of the plate member with equal thickness, the bottom surface of the screw head is provided with a clamping structure and is clamped with the gasket; a plurality of radial slits with a slit length less than the width of the ring part of the gasket are formed on the peripheral surface of the gasket along the radial direction of the gasket, a circumferential slit is formed along at least one side of the peripheral surface of the gasket starting from the bottom of the radial slit, the corresponding L-shaped slit formed by the radial slit and the circumferential slit on the corresponding side separates a corresponding strip part on the gasket body, the corresponding strip part on the gasket body constitutes a corresponding flap, the corresponding flap on the corresponding side is obliquely turned up at an acute angle towards the same surface direction of the gasket, and the corresponding flaps on the corresponding side are distributed in rotational symmetry with the center of the gasket as the axis; characterized in that: The circular sink is an axial slot-free circular sink of the sink wall surface; the clamping structure is at least one spiral ramp surface provided on the bottom surface of the screw head near the outer peripheral edge; the outer ring surface profile of the gasket when completely flattened is a complete circle; when the screw is loosened, the outer end of at least one tab is relatively displaced toward the top of the corresponding ramp surface and is further pressed down by the ramp surface; the bottom surface of the screw head near the central axis is provided with a limiting convex ring higher than all the ramp surfaces.

2. The self-tightening anti-loosening screw fastening structure according to claim 1, characterized in that: The screw head is a beta screw head, and multiple ramp surfaces are rotationally symmetrically provided on the bottom surface of the beta screw head near the outer peripheral edge, and the terminal top of each ramp surface is integrally connected with the starting bottom of the adjacent ramp surface through a transition steep slope surface.

3. The self-tightening anti-loosening screw fastening structure according to claim 1, characterized in that: The screw head is a gamma screw head, and one twisted circular ring-shaped ramp surface is provided on the bottom surface of the gamma screw head near the outer peripheral edge, and the slope surface of the ring-shaped ramp surface is half a circle raised and half a circle lowered and head-tail closed.

4. The self-tightening anti-loosening screw fastening structure according to claim 1, characterized in that: The nail rod is an alpha nail rod, and the rod body of the alpha nail rod is an equal-diameter screw rod structure.

5. The self-tightening anti-loosening screw fastening structure according to claim 1, characterized in that: The nail rod is a beta nail rod, and the bottom end of the beta nail rod is a self-tapping screw structure.

6. A self-tightening anti-loosening screw fastening structure according to any one of claims 1 to 5, characterized in that: The gasket is a beta gasket, and multiple radial slits with a slit length smaller than the ring width of the gasket are provided on the circumference of the beta gasket along the radial direction of the gasket, and a circumferential slit is provided on one side of the gasket along the circumferential direction of the gasket starting from the slit bottom of the radial slit, which is an alpha circumferential slit, and the other side is a beta circumferential slit; the L-shaped slit formed by the radial slit and the alpha circumferential slit separates an alpha tab on the gasket body; the L-shaped slit formed by the radial slit and the beta circumferential slit separates a beta tab on the gasket body; the alpha tab is obliquely turned up at an acute angle toward one side of the gasket; the beta tab is obliquely turned up at an acute angle toward the other side of the gasket; the tabs on the corresponding sides are rotationally symmetrically distributed about the center of the gasket.

7. A self-tightening anti-loosening screw fastening structure according to any one of claims 1 to 5, wherein: The gasket is a gamma gasket, and multiple radial slits with a slit length smaller than the ring width of the gasket are provided on the circumference of the gamma gasket along the radial direction of the gasket, and a circumferential slit is provided on one side of the gasket along the circumferential direction of the gasket starting from the slit bottom of the radial slit; the corresponding L-shaped slit formed by the radial slit and the circumferential slit separates a corresponding tab on the gasket body; the elastic tab is obliquely turned up at an acute angle toward the same side of the gasket; the elastic tabs are rotationally symmetrically distributed about the center of the gasket.

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