CN215861254U - Bolt structure and bolt and nut assembly capable of preventing loosening - Google Patents

Abstract

The utility model provides a bolt structure and a bolt and nut assembly for preventing loosening, and relates to the technical field of bolt fasteners; a bolt structure comprises a bolt and a gasket unit matched with the bolt; the bolt comprises a head and a screw rod connected with the head, an expansion groove extending towards the head is formed in the screw rod, the screw rod is divided into a plurality of separation flaps perpendicular to the head by the expansion groove, the gasket unit comprises a gasket for the penetration of the separation flaps on the screw rod and an expansion flap vertically connected to one side of the gasket, and the other side of the gasket is a plane; the expansion sheet corresponds to the expansion groove; one end of the expansion piece, which is far away from the gasket, is provided with an expansion section; the bolt structure of the utility model is suitable for clamped objects with different thicknesses, has small resistance in the installation process, is easy to expand at the tail end of the bolt, is matched with a nut for use, has good fixing function on the clamped objects, and is not easy to loosen and fall off.

Description

Bolt structure and bolt and nut assembly capable of preventing loosening

Technical Field

The utility model relates to the technical field of bolt fasteners, in particular to a bolt structure and a bolt and nut assembly capable of preventing loosening.

Background

At present, most of the bolts in the market are in a bolt fastening mode of a common bolt, a common flat gasket and a common nut, the outer diameter of the nut is the same as the inner diameter of the nut, and when the thread of the nut slides and rotates along the thread of the screw, the nut can approach the head of the screw or leave the head of the screw, so that the purpose of screwing or unscrewing is achieved. In long-term use, when the tightened object vibrates, the nut is easy to loosen or fall off due to resonance.

The prior art discloses a check bolt: the expansion joint comprises a screw, an expansion rod and a screw cap, wherein a cross groove is formed in the screw, the tail end of the screw extends towards the head of the screw, the expansion rod comprises a gasket and guide rods which penetrate through the whole gasket and extend towards the two ends of the gasket, and the expansion rod can move in the cross groove; and an expansion head is arranged at one end of the guide rod, the expansion head is a cylinder with a wedged inclined plane, after the anti-loosening bolt is tightened, the expansion head is clamped at the tail end of the cross groove to expand the tail end of the screw rod, and the nut is tightly attached to the gasket.

Although the above-mentioned anti-loosening bolt has certain anti-loosening and anti-dropping effects, it still has the following defects:

1. the thickness of the clamped object is required, if the thickness is thinner, the guide rod can be pushed to the head of the screw rod to prevent the nut from being close to the head of the screw rod;

2. the tail end of the guide rod is provided with the expansion head which is spherical and the inclined surface is short in length, when the guide rod is close to the head of the screw rod, the tail end of the guide rod can be driven to feed the contact surface of the cross groove under great pressure, the screw rod can be extruded by the inclined surface of the expansion head to form a groove, resistance is increased, installation is difficult, and the guide rod can be broken due to too large pressure.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome at least one defect (deficiency) of the prior art and provides a bolt structure which has small resistance in the expansion process and wide applicable range of clamped objects.

The utility model also aims to provide the bolt and nut assembly capable of preventing loosening, which has good anti-loosening and anti-falling effects and is convenient and quick to install.

The technical scheme adopted by the utility model is that the bolt structure comprises a bolt and a gasket unit matched with the bolt; the bolt comprises a head and a screw rod connected with the head, an expansion groove extending towards the head is formed in the screw rod, the screw rod is divided into a plurality of separation flaps perpendicular to the head by the expansion groove, the gasket unit comprises a gasket for the penetration of the separation flaps on the screw rod and an expansion flap vertically connected to one side of the gasket, and the other side of the gasket is a plane; the expansion sheet corresponds to the expansion groove; one end of the expansion piece, which is far away from the gasket, is provided with an expansion section.

In the utility model, the expansion sheet is arranged on only one side of the gasket unit, when an object to be clamped is sleeved on the screw rod and moves to be attached to the head, the gasket unit sleeves the plurality of separation flaps, the expansion sheet on the gasket unit is embedded into an expansion groove formed by the plurality of separation flaps, and the gasket unit moves towards the head to drive the expansion sheet to move in the expansion groove; when the expansion section on the expansion piece is in contact with the separation flap, an interaction force is generated between the expansion section and the separation flap, and the extrusion force of the expansion section on the separation flap is larger, so that the tail end of the separation flap is spread, namely one end of the bolt, which is far away from the head, is expanded; the clamped object is difficult to displace and change, and the joint side of the gasket unit and the clamped object is not provided with other extension parts, so that the bolt structure has wider application range for clamped objects with different thicknesses.

Specifically, the expansion groove is divided into a flat part and an expansion part connected with the flat part, the flat part is connected with the head part, the cross section area of the flat part is unchanged, and the cross section area of the expansion part gradually decreases from the notch to the head part until the cross section area is the same as that of the flat part; the expansion section of the expansion piece is connected to the flat section of the gasket, and the flat section of the expansion piece is smaller than or equal to the length of the flat part of the expansion groove; the maximum cross-sectional area of the expansion section of the expansion piece is larger than the maximum cross-sectional area of the expansion part of the expansion groove.

The cross section area of the gentle part of the expansion groove is unchanged, namely the aperture of the part of the groove of the gentle part of the expansion groove is uniform and corresponds to the gentle section of the expansion sheet, so that the expansion groove has a better guiding effect during installation and has small resistance during installation; the expansion part of the expansion groove starts from the junction of the flat part and the expansion part, the cross section area of the expansion part is continuously enlarged, namely the hole diameter of the part of the groove of the expansion part from the notch to the head part direction is continuously enlarged, the expansion section of the expansion piece also has the same trend, the maximum cross section area of the expansion section of the expansion piece is larger than the maximum cross section area of the expansion part of the expansion groove, and the flat part of the expansion piece is ensured to be smaller than or equal to the length of the flat part of the expansion groove, so that the expansion section of the expansion piece can ensure that one end of the bolt far away from the head part can be expanded.

Furthermore, a plurality of through holes are formed in the gasket and correspond to the separating flaps one to one.

If the through holes in the gasket are not in one-to-one correspondence with the separating flaps, namely, several separating flaps are possibly in the same through hole, when the separating flaps deform outwards under the action of stress, the separating flaps are possibly restrained by the gasket, the expansion is more resistant, and the same through hole in the gasket is possibly damaged under the action of forces in different directions; when each through hole corresponds to each separating flap one by one, the separating flaps are subjected to little or no binding force of the gasket when being expanded, and the through holes of the separating flaps are not damaged by the force in different directions.

Further, the cross-sectional area S1 of the through hole is larger than the maximum cross-sectional area S2 of the separation flap.

So that the gasket cover is established on the separation lamella, and when the separation lamella takes place the inflation, the gasket is less to its constraining force, is favorable to the inflation.

Further, 1.1S2 is less than or equal to S1 is less than or equal to 1.5S 2.

When the cross section area of the through hole is too small, the gasket is not favorably sleeved on the petal and is easy to be damaged, and when the cross section area of the through hole is too large, the expansion piece moves in the expansion groove, so the maximum cross section area of the expansion piece is smaller than the cross section area of the screw rod, the expansion piece is connected with the gasket and needs to be connected with the gasket through some connecting accessories on the circumference of the gasket, and thus the gasket and the connecting accessories of the expansion piece are easy to deform or break.

Further, the separation flaps are equal in size.

The separating flaps are equal in size, so that the contact area between each separating flap and the expansion piece is ensured to be the same, the mutual acting force is the same, the installation and expansion of the bolt structure are facilitated, and parts of the bolt structure are not easy to damage.

Further, the screw is divided into two of the separate lobes.

Two the separation lamella is the required minimum separation lamella of inflation takes place for the bolt, the screw rod is cut apart into two the separation lamella, expansion piece and each the separation lamella has the biggest area of contact, is convenient for the expansion piece is in the expansion inslot removes, just state the separation lamella with the expansion piece have better tolerance, the damage of bolt is less, the expansion piece or the condition of separation lamella rupture of difficult emergence.

A bolt and nut assembly for preventing loosening comprises the bolt structure and a nut matched with the bolt; the nut is sleeved on the screw rod and attached to the gasket.

The nut is sleeved on the bolt structure, and because one end of the bolt, which is far away from the head, expands, the clamped object is vibrated and is difficult to displace, so that the nut is ensured not to loosen or fall off.

Further, a thread-free transition section is arranged between the screw rod and the head, and the height of the thread-free transition section is smaller than that of the nut.

The friction of the clamped objects can be reduced by arranging the unthreaded transition section, the height of the unthreaded transition section is smaller than that of the nut, and the bolt and nut assembly can be ensured to be suitable for clamped objects with various thicknesses.

Or further, a non-threaded transition section is arranged between the screw rod and the head, and the height of the non-threaded transition section is less than two thirds of the sum of the heights of the nut and the gasket.

The arrangement of the unthreaded transition section can reduce friction when an object to be clamped is sleeved, the height of the unthreaded transition section is smaller than that of the nut, so that the bolt and nut assembly can be suitable for objects to be clamped with various thicknesses, and the nut can be matched with more threads on the screw rod even if the thickness of the object to be clamped is small, so that a better screwing effect is achieved.

Compared with the prior art, the utility model has the beneficial effects that: the bolt structure of the utility model is suitable for clamped objects with different thicknesses, has small resistance in the installation process, is easy to expand at the tail end of the bolt, is matched with a nut for use, has good fixing function on the clamped objects, and is not easy to loosen and fall off.

Drawings

Fig. 1 is a view showing a structure of a bolt of the present invention.

Fig. 2 is a structural view of a bolt body of the present invention.

Fig. 3 is a front view of the bolt body of the present invention.

Fig. 4 is a structural view of a gasket unit of the present invention.

Fig. 5 is a front view of the shim unit of the present invention.

FIG. 6 is a top view of a shim unit of the present invention.

Fig. 7 is a structural view of a bolt and nut assembly of the present invention.

Fig. 8 is a structural view of an installation process of the bolt-nut assembly of the present invention.

Fig. 9 is a view showing a structure of the bolt and nut assembly of the present invention after completion of installation.

In the drawings are labeled: bolt-100, head-110, separating flap-120, expanding groove-130; a gasket unit-200, a gasket-210, an expansion sheet-220 and a through hole-230; a nut-300 and an object to be clamped-400.

Detailed Description

The drawings are only for purposes of illustration and are not to be construed as limiting the utility model. For a better understanding of the following embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

Example 1

As shown in fig. 1, a bolt 100 structure includes a bolt 100, a shim unit 200 coupled to the bolt 100; the bolt 100 comprises a head 110 and a screw rod connected with the head 110, wherein an expansion groove 130 extending towards the head 110 is formed in the screw rod, and the expansion groove 130 divides the screw rod into a plurality of separation flaps 120 perpendicular to the head 110; the gasket unit 200 comprises a gasket 210 through which the plurality of separating flaps 120 on the screw rod can pass, and an expansion piece 220 vertically connected to one side of the gasket 210, and the other side of the gasket 210 is a plane; the expansion piece 220 corresponds to the expansion slot 130; the end of the expansion piece 220 away from the gasket 210 is provided with an expansion section.

In this embodiment, the expansion piece 220 is disposed on only one side of the gasket unit 200, when the object 400 to be clamped is sleeved on the screw rod and moves to be attached to the head 110, the gasket unit 200 is sleeved on the plurality of separation flaps 120, the expansion piece 220 on the gasket unit 200 is embedded in the expansion groove 130 formed by the plurality of separation flaps 120, and the gasket unit 200 moves towards the head 110 to drive the expansion piece 220 to move in the expansion groove 130; when the expansion section on the expansion piece 220 contacts with the separation flap 120, an interaction force is generated between the expansion section and the separation flap 120, and since the extrusion force of the expansion section on the separation flap 120 is larger, the tail end of the separation flap 120 is spread, that is, one end of the bolt 100 away from the head 110 expands; the clamped object 400 is hard to displace and change, and the joint side of the gasket unit 200 and the clamped object 400 is not provided with other extending parts, so that the bolt 100 structure of the embodiment has a wider application range for clamped objects 400 with different thicknesses.

In this embodiment, as shown in fig. 2 and 3, the expansion slot 130 is divided into a flat part and an expansion part connected with the flat part, the flat part is connected with the head part 110, the cross-sectional area of the flat part is constant, and the cross-sectional area of the expansion part gradually decreases from the notch to the head part 110 until the cross-sectional area of the expansion part is the same as that of the flat part; as shown in fig. 4 and 5, the expansion segment of the expansion piece 220 is connected to the flat segment of the gasket 210, and the flat segment of the expansion piece 220 is less than or equal to the length of the flat segment of the expansion slot 130; the maximum cross-sectional area of the expansion segment of the expansion piece 220 is greater than the maximum cross-sectional area of the expansion portion of the expansion slot 130.

The cross section area of the flat part of the expansion slot 130 is not changed, namely the aperture of the slot of the flat part of the expansion slot 130 is uniform and corresponds to the flat part of the expansion sheet 220, so that the expansion slot has better guiding function during installation and has small resistance during installation; the cross-sectional area of the expansion portion of the expansion slot 130 increases from the intersection of the flat portion and the expansion portion, that is, the hole diameter of the slot of the expansion portion increases from the slot opening to the head portion 110, the expansion section of the expansion piece 220 also has the same trend, the maximum cross-sectional area of the expansion section of the expansion piece 220 is larger than the maximum cross-sectional area of the expansion portion of the expansion slot 130, and the flat portion of the expansion piece 220 is ensured to be smaller than or equal to the length of the flat portion of the expansion slot 130, so as to ensure that the expansion section of the expansion piece 220 can expand the end of the bolt 100 away from the head portion 110.

In this embodiment, as shown in fig. 2 and 3, the screw is divided into two separating flaps 120, the two separating flaps 120 have the same size, as shown in fig. 4 and 6, two through holes 230 are formed in the gasket 210, and the through holes 230 correspond to the separating flaps 120 one to one.

The screw rod is divided into two separation flaps 120, the two separation flaps 120 are equal in size, the expansion flap 220 and each separation flap 120 have the largest contact area, the contact areas of the separation flaps 120 and the expansion flaps 220 are the same, and the mutual acting forces are the same, so that the bolt 100 structure is favorable for moving the expansion flaps 220 in the expansion groove 130 in the installation process, and the parts of the bolt 100 structure are not easily damaged during expansion. Each of the through holes 230 corresponds to each of the separating flaps 120 one to one, and one through hole 230 corresponds to a plurality of separating flaps 120, and is subjected to little or no binding force of the gasket 210 when being expanded, and the through holes 230 of the separating flaps 120 are not damaged by forces in a plurality of different directions.

In the present embodiment, the cross-sectional area of the through-hole 230 is 1.1 times the cross-sectional area of the separation flap 120. When the cross-sectional area of through-hole is too little, be unfavorable for the gasket cover is established on the lamella and easily receive the damage, and works as when the cross-sectional area of through-hole is too big, the gasket is easy yielding or fracture with the connecting portion position of expansion piece.

Example 2

An anti-loosening bolt 100 and nut 300 assembly, as shown in fig. 7, comprises the bolt 100 structure as described in embodiment 1, and a nut 300 matched with the bolt 100; the nut 300 is sleeved on the screw and attached to the gasket 210.

The nut 300 is sleeved on the bolt 100 structure, and because one end of the bolt 100 far away from the head 110 expands, the clamped object 400 is difficult to displace due to vibration, so that the nut 300 is ensured not to loosen or fall off.

A non-threaded transition section is further arranged between the screw and the head 110, and the height of the non-threaded transition section is less than two thirds of the sum of the heights of the nut 300 and the gasket 210.

The friction of the clamped object 400 during sleeving can be reduced by arranging the unthreaded transition section, the height of the unthreaded transition section is smaller than that of the nut 300, the bolt 100 and nut 300 assembly provided by the utility model can be ensured to be suitable for clamped objects 400 with various thicknesses, and even if the clamped object 400 is small in thickness, the nut 300 can still be matched with more threads on the screw rod, so that a better screwing effect is achieved.

As shown in fig. 8, in the installation process of the bolt 100 and nut 300 assembly, the clamped object 400 is sleeved on the screw, the gasket unit 200 and the nut 300 are sleeved on the separation flap 120 on the screw, the nut 300 moves downwards along the thread (not shown) on the screw, the gasket 210 and the expansion piece 220 also move downwards synchronously until the gasket 210 is tightly attached to the clamped object 400, as shown in fig. 9, at which time, the tail end of the separation flap 120 expands.

It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the technical solutions of the present invention, and are not intended to limit the specific embodiments of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention claims should be included in the protection scope of the present invention claims.

Claims (10)

1. A bolt structure comprises a bolt and a gasket unit matched with the bolt; the bolt comprises a head and a screw rod connected with the head, an expansion groove extending towards the head is formed in the screw rod, and the expansion groove divides the screw rod into a plurality of separation flaps perpendicular to the head; the expansion sheet corresponds to the expansion groove; one end of the expansion piece, which is far away from the gasket, is provided with an expansion section.

2. The bolt structure according to claim 1, wherein the expansion groove is divided into a flat portion and an expansion portion connected to the flat portion, the flat portion is connected to the head portion, the cross-sectional area of the expansion portion is constant, and the cross-sectional area of the expansion portion gradually decreases from the notch toward the head portion until the cross-sectional area of the expansion portion is equal to that of the flat portion; the expansion section of the expansion piece is connected to the flat section of the gasket, and the flat section of the expansion piece is smaller than or equal to the length of the flat part of the expansion groove; the maximum cross-sectional area of the expansion section of the expansion piece is larger than the maximum cross-sectional area of the expansion part of the expansion groove.

3. The bolt structure according to claim 1, wherein the washer is provided with a plurality of through holes, and the through holes correspond to the separate flaps one to one.

4. A bolt construction according to claim 3, wherein the cross-sectional area S1 of the through hole is greater than the maximum cross-sectional area S2 of the separate lobe.

5. A bolt construction according to claim 4 characterised in that 1.1S2 ≦ S1 ≦ 1.5S 2.

6. A bolt construction according to claim 1 wherein a plurality of said spaced apart flaps are of equal size.

7. A bolt structure according to any one of claims 1 to 6, wherein the shank is divided into two of said separate lobes.

8. A bolt and nut assembly for preventing loosening, which is characterized by comprising a bolt structure according to any one of claims 1-7 and a nut matched with the bolt; the nut is sleeved on the screw rod and attached to the gasket.

9. The anti-loosening bolt nut assembly according to claim 8, wherein a thread-free transition section is further arranged between the screw rod and the head, and the height of the thread-free transition section is smaller than that of the nut.

10. The anti-loosening bolt and nut assembly according to claim 8, wherein a thread-free transition is further provided between the threaded rod and the head, and the height of the thread-free transition is less than two-thirds of the sum of the heights of the nut and the washer.

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