CN218266748U - Anti-loose combined fastener structure - Google Patents

Abstract

The utility model discloses a locking combined fastener structure, wherein, a lower plate and an upper plate are correspondingly provided with a lower mounting counter bore and an upper mounting counter bore; the inner diameter of the bushing is larger than the nominal outer diameter of the external thread rod of the bolt and smaller than the diameter of the polish rod under the head of the bolt; the outer diameter of the bush is smaller than the aperture of the lower mounting counter bore and smaller than the aperture of the upper mounting counter bore; the space formed between the lining and the head lower polish rod, the screw rod upper polish rod and the mounting counter bore forms a clamping groove; in the screwing and assembling process, the bolt penetrates through the bushings arranged in the lower mounting counter bore and the upper mounting counter bore and is screwed in the internal thread hole of the lower plate downwards; when the lower end of the flange head of the bolt is screwed down and is tightly attached to the upper end face of the upper plate to finish assembly, the bush is filled into the clamping groove. The fastener is simple in structure, high in shearing load and capable of absorbing vibration and preventing fatigue fracture, does not need high machining precision and special machining process, cannot damage workpieces, and is an economic anti-loosening fastener.

Description

Anti-loose combined fastener structure

Technical Field

The utility model belongs to the technical field of the fastener is made, concretely relates to integrated configuration's locking fastener.

Background

Fasteners are a class of mechanical parts used for fastening connections and are used in a very wide variety of applications. A wide variety of fasteners are found on a variety of machines, equipment, vehicles, boats, railways, bridges, buildings, structures, tools, instruments, meters, supplies, and the like.

The connecting mode of the fastener mainly comprises welding, riveting and screwing. The tightening is known as the most basic connection mode of the fastener, compared with most other connection modes, the tightening of the existing screw thread has the advantages that the fastener can be disassembled and recycled, but the fastener without the anti-loosening measure (such as the existing bolt 10 shown in fig. 1) is screwed (such as the screwed state of the existing bolt 10 and the upper plate 20 and the lower plate 30 shown in fig. 2), and under the action of long-time dynamic load and environmental oxidation corrosion, the relative movement between the screw threads is inevitable, and further the fastener is loosened and removed.

The economic, effective and long-time-effect anti-loose fastener structure is a field worth of people to be deeply researched. Most of the existing anti-loosening measures are to increase the effective torque, such as the all-metal effective torque type locknut 40 shown in fig. 3 and the nylon nut 50 shown in fig. 4. The all-metal effective torque type lock nut 40 needs to be added with a pressing process, and an internal thread deformation part 41 appears in the pressing process, so that effective torque is increased; in addition, the nylon nut 50 has high requirements for positioning of nylon 51, the nylon 51 size also needs to be designed, the threads are coated with anti-loosening glue, and the interference fit or transition fit of the threads has the problem of high requirements for machining precision.

Therefore, the existing fastener anti-loosening measures have the defects of complex structure, high machining precision requirement, additional special machining process, high cost and the like.

SUMMERY OF THE UTILITY MODEL

For solving the problems existing in the prior art, the utility model provides a locking combined fastener structure. The fastener structure achieves high shear load through a simple combined structure, can absorb vibration and prevent fatigue fracture, and is an economic anti-loosening fastener which does not need high processing precision and special processing technology, can not damage workpieces.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a locking combined fastener structure comprises a bolt, a bushing, a lower plate and an upper plate;

the lower plate and the upper plate are correspondingly provided with communicated mounting counter bores, and the lower mounting counter bores comprise lower mounting counter bores arranged in the lower plate and upper mounting counter bores arranged in the upper plate; an internal threaded hole is formed below the lower mounting counter bore;

the bolt consists of a flange head, a polish rod below the head, a polish rod above the screw rod and an external thread rod in sequence;

the inner diameter of the bushing is larger than the nominal outer diameter of the external thread rod and smaller than the diameter of the under-head polished rod; the outer diameter of the bushing is smaller than the aperture of the lower mounting counter bore and smaller than the aperture of the upper mounting counter bore; in the bushing, the space formed among the bushing, the head lower polish rod, the screw rod upper polish rod and the mounting counter bore forms a clamping groove;

in the screwing assembly process, the bushing is arranged in the lower mounting counter bore and the upper mounting counter bore, and the bolt penetrates through the bushing and is screwed downwards in the internal thread hole of the lower plate; when the lower end of the flange head of the bolt is screwed down and is tightly attached to the upper end face of the upper plate to finish assembly, the bush is filled into the clamping groove.

A locking combined fastener structure comprises a bolt, a bushing, a lower plate and an upper plate; the lower plate and the upper plate are correspondingly provided with communicated mounting counter bores, and the lower plate and the upper plate comprise lower mounting counter bores arranged in the lower plate and upper mounting counter bores arranged in the upper plate; the lower mounting counter bore consists of an upper counter bore and a lower counter bore which are communicated, and an internal thread hole is arranged below the lower counter bore; the inner diameter of the upper counter bore is larger than that of the lower counter bore;

the bolt consists of a flange head, a polish rod below the head, a polish rod above the screw rod and an external thread rod in sequence; a clamping ring is arranged at the joint of the external thread rod and the upper polish rod of the screw rod, and the outer diameter of the clamping ring is larger than the inner diameter of the bushing and smaller than the inner diameter of the lower counter bore of the lower plate; the outer diameter of the retainer ring is larger than the nominal outer diameter of the external thread rod; the lower head polish rod is in transition connection with the upper screw rod through an upper end chamfer;

a bushing having an inner diameter less than the diameter of the underhead polished rod; the outer diameter of the bushing is smaller than the aperture of the upper mounting counter bore and smaller than the aperture of the upper counter bore; in the bushing, a clamping groove is formed by the space formed among the bushing, the polish rod under the head, the polish rod on the screw rod and the mounting counter bore;

a bushing having an inner diameter less than the diameter of the underhead polished rod; the outer diameter of the bushing is smaller than the aperture of the upper mounting counter bore and smaller than the aperture of the upper counter bore; the thickness of the bushing is less than or equal to the distance from the joint of the polish rod under the head and the upper end chamfer to the clamping ring; in the bushing, the space formed between the bushing and the polish rod under the head, the space formed between the polish rod on the screw rod and the mounting counter bore form a clamping groove;

in the process of screwing and assembling, the bolt is screwed downwards in an internal thread hole of the lower plate; when the lower end of the flange head of the bolt is screwed down and is tightly attached to the upper end face of the upper plate to finish assembly, the lining is filled downwards on the clamping ring and extends upwards to form a clamping groove.

The anti-loose combined fastener structure is characterized in that the bushing is a nylon bushing or an aluminum bushing.

The technical scheme provided by the above has the following beneficial effects:

firstly, the utility model discloses locking combination fastener structure's bolt has the draw-in groove, increases the bush when screwing up between bolt and hypoplastron and the upper plate, and the bolt after the twist radially receives the extrusion force of bush to it, receives the influence of this extrusion force, has increased the positioning accuracy when the bolt assembly.

Secondly, the utility model discloses locking combination fastener structure's bush receives extrusion deformation interference fit in hollow region between bolt and hypoplastron and the upper plate works as when the bolt has the trend of drunkenness from top to bottom, the bush can be applyed the bolt and with opposite direction's frictional force, hinder it not hard up, prevent that the bolt from droing.

Thirdly, the utility model discloses locking combined fastener structure's bolt is clearance fit with the threaded connection of hypoplastron, and the bush is interference fit, so the bush can preferentially absorb and come from external vibration and shearing force, has improved the utility model discloses locking combined fastener structure overall structure's shear strength prevents fatigue fracture, increase of service life.

Fourthly, the utility model discloses rand is add to locking combined fastener structure's bolt screw thread upper end, accomplishes screw thread output and bush combination in the lump when rolling teeth, saves the action of putting into the bush during assembly.

Fifthly, the utility model discloses rand is add to locking combined fastener structure bolt's screw thread portion upper end, accomplishes screw thread output and bush combination in the lump when rolling teeth, when avoiding twisting, and the bush receives extrusion deformation, and the material flows into the screw thread end footpath, leads to the screw thread card to fill in.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:

FIG. 1 is a perspective view of a prior art bolt;

FIG. 2 is a schematic view of a prior art bolt assembly;

FIG. 3 is a schematic perspective view of a prior art all-metal efficient torque-type lock nut;

FIG. 4 is a cross-sectional structural schematic of a prior art nylon nut;

fig. 5 is a schematic perspective view of the bolt of the present invention;

fig. 6 is a schematic perspective view of the bushing of the present invention;

fig. 7 is a schematic sectional view of the bolt of the present invention before being screwed;

fig. 8 is a schematic sectional view showing the screwing process of the bolt according to the present invention;

fig. 9 is a schematic sectional view of the bolt of the present invention after being screwed;

FIG. 10 is a schematic view of a partially enlarged structure of the mounting counter bore after the bolt of the present invention is screwed in;

fig. 11 is a schematic perspective view of the bolt (with a clamping ring) of the present invention;

fig. 12 is a schematic sectional view of the bolt (with a collar) of the present invention before being screwed in;

fig. 13 is a schematic sectional view showing the screwing process of the bolt (with the snap ring) according to the present invention;

fig. 14 is a schematic sectional view of the bolt (with a collar) according to the present invention after being screwed in.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention clearer and more obvious, the following description of the present invention with reference to the accompanying drawings and embodiments is provided for further details. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

In the claims, the specification and the drawings, unless otherwise expressly limited, the terms "first," "second," or "third," etc. are used for distinguishing between different elements and not for describing a particular sequence.

In the claims, the specification and the drawings, unless otherwise expressly limited, the terms "central", "lateral", "longitudinal", "horizontal", "vertical", "top", "bottom", "inner", "outer", "upper", "lower", "front", "rear", "left", "right", "clockwise", "counterclockwise" and the like, with respect to the directional terms, indicate directions or positional relationships based on the directions and positional relationships shown in the drawings, and are only for convenience of description of the present invention and for simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be construed as limiting the scope of the present invention.

In the claims, the description and the drawings of the present application, unless otherwise expressly limited, the term "fixedly connected" or "fixedly connected" is used, which is to be understood broadly, that is, any connection mode without displacement relation or relative rotation relation between the two, that is, including non-detachably fixed connection, integrated connection and fixed connection through other devices or elements.

In the claims, the specification and the drawings of the present application, the terms "including", "comprising" and variations thereof, if used, are intended to be inclusive and not limiting.

Referring now to fig. 5 to 14, a structure of a locking combination fastener of the present invention will be described. The anti-loose combination fastener structure comprises a bolt 100, a bushing 200, a lower plate 300 and an upper plate 400. The utility model discloses hypoplastron 300 and upper plate 400 correspond and are equipped with communicating installation counter bore, the installation counter bore is for establishing lower installation counter bore 310 in hypoplastron 300, and establish last installation counter bore 410 in upper plate 400. The lower plate 300 has an internally threaded hole 320 below the lower mounting counterbore 310.

As shown in fig. 5, the bolt 100 of the present invention is sequentially composed of a flange head 110, a head lower polish rod 120, a screw upper polish rod 130 and an external screw rod 140.

In this embodiment, the flange head 110 is a hexagonal flange head. The hexagonal opposite angle of the hexagonal flange head is 11.30-11.40mm, the opposite angle is 9.78-10.00mm, and the diameter of the flange rim connected with the hexagonal through the transition round chamfer is 16.90-17.10mm. The head shape can also be common four corners, hexagonal, octagonal, circular and the like, is not specially limited, and is designed according to specific needs.

In this embodiment, the under-head polish rod 120 disposed at the lower portion of the flange head 110 is a rod member having a diameter of 9.00-9.10mm and a length of 5.75-5.85 mm. The lower head polish rod 120 and the upper screw rod 130 are transitionally connected through an upper end chamfer 150. The lower end of the upper polish rod 130 of the screw rod with the diameter of 6.65-6.70mm and the length of 1.45-1.55mm forms an M8 external thread rod 140 with the length of 15.40-15.60mm, and the tail end of the external thread rod 140 is provided with a tail end chamfer 160. As shown in fig. 6 and 7, the inner diameter of the bush 200 of the present invention is larger than the nominal outer diameter of the male screw rod 140, and the inner diameter of the bush 200 is smaller than the diameter of the underhead polish rod 120. The outer diameter of the bushing 200 is smaller than the diameter of the lower mounting counterbore 310 provided in the lower plate 300, and the outer diameter of the bushing 200 is smaller than the diameter of the upper mounting counterbore 410 provided in the upper plate 400. In this embodiment, the inner diameter of the bushing 200 is 8.40-8.50mm, the outer diameter is 11.95-12.05m, and the thickness is 5.70-5.80mm. The bushing 200 is a nylon bushing or an aluminum bushing.

In this embodiment, the anti-loose combined fastener structure of the present invention is arranged in the tightening assembling process, and the bushing 200 is arranged in the lower mounting counter bore 310 and the upper mounting counter bore 410. The bolt 100 is inserted into the bushing 200 and screwed downward into the internally threaded hole 320 of the lower plate 300. In the bushing 200, a space formed between the bushing 200 and the lower head polish rod 120, the upper screw polish rod 130 and the mounting counter bore constitutes a clamping groove 500.

In the tightening and assembling process of the anti-loose combined fastener structure of the present invention, as shown in fig. 7, the bushing 200 is first placed into the lower mounting counter bore 310 and the upper mounting counter bore 410 corresponding to the lower plate 300 and the upper plate 400 to be connected; then the bolt 100 is easily screwed in through the internally threaded hole 320 of the lower plate 300 until the end chamfer 160 of the polish rod 120 of the lower head abuts against the upper end of the bushing 200; as shown in fig. 8, as the torque is increased, the bolt 100 is tightened downward, and the bushing 200 is deformed in a pressing manner and extends toward the upper openings of the locking groove 500 and the upper plate 400; as shown in fig. 9, the lower end of the flange head 110 of the bolt 100 is tightened to abut against the upper end surface of the upper plate 400, and the assembly is completed; at this time, the bush 200 is filled in the catching groove 500, and the bolt 100 clamps the upper and lower plates 400 and 300.

As shown in fig. 10, after the bolt 100 is screwed in, the head lower polish rod 120 of the bolt 100 and the screwed screw upper polish rod 130 are subjected to a pressing force N by the bushing 200 in the radial direction, and the positioning accuracy of the bolt 100 during assembly is increased due to the pressing force N.

Since the bushing 200 is a hollow region which is press-deformed and interference-fitted between the bolt 100 and the lower plate 400 and the upper plate 300, when the bolt 100 has a tendency to move up and down V, the bushing 200 applies a frictional force f to the bolt 100 in a direction opposite to V, and prevents the bolt from loosening.

After assembling, because the threaded connection of bolt 200 and hypoplastron 400 is clearance fit, and bush 200 is interference fit, so bush 200 can be preferred to absorb and come from external vibration and shearing force, has improved the utility model discloses locking combined fastener structure overall structure's shear strength prevents fatigue fracture.

Further, in order to prevent the bushing 200 from being deformed by pressure during the tightening process, the material deformed by the downward expansion is mistakenly inserted into the small diameter of the external thread 140 of the bolt 100, so that the bolt 100 cannot be screwed continuously. As shown in fig. 11, in the present embodiment, the anti-loose combination fastener structure includes a bolt 100, a bushing 200, a lower plate 300, and an upper plate 400.

The lower plate 300 and the upper plate 400 are correspondingly provided with mounting counterbores communicated with each other, and the mounting counterbores comprise a lower mounting counterbore 310 arranged in the lower plate 300 and an upper mounting counterbore 410 arranged in the upper plate 400. The lower mounting counter bore 310 is composed of an upper counter bore 311 and a lower counter bore 312 which are communicated, the lower counter bore 312 is arranged above the internal thread hole 320, and the internal thread hole 320 is arranged below the lower counter bore 312; the upper counterbore 311 has an inner diameter greater than the inner diameter of the lower counterbore 312.

The bolt 100 is composed of a flange head 110, a head lower polish rod 120, a screw upper polish rod 130 and an external thread rod 140 in sequence; a clamping ring 600 is arranged at the joint of the external thread rod 140 and the screw upper polish rod 130, the outer diameter of the clamping ring 600 is larger than the inner diameter of the bushing 200 and smaller than the inner diameter of the sinking hole 312 of the lower plate 300; and the collar 600 has an outer diameter greater than the nominal outer diameter of the externally threaded rod 140. The lower head polish rod 120 and the upper screw rod 130 are transitionally connected through an upper end chamfer 150.

The inner diameter of the bushing 200 is smaller than the diameter of the sub-head polish rod 120; the outer diameter of the bushing 200 is smaller than the aperture of the upper mounting counter bore 410 and smaller than the aperture of the upper counter bore 311; in the bushing 200, a clamping groove 500 is formed by the space formed between the bushing 200 and the lower head polish rod 120, the upper screw rod 130 and the mounting counter bore. The thickness of the bushing 200 is less than or equal to the distance from the junction of the sub-head polished rod 120 and the upper chamfer 150 to the retainer ring 600.

The utility model discloses locking combination fastener structure in external screw thread pole 140 with the department of meeting of polished rod 130 is equipped with a rand 600 on the screw rod, and this rand 600 external diameter should be greater than bush 200 internal diameter, and this rand 600's external diameter is less than hypoplastron 300's sink hole 312 internal diameter. In this embodiment, the thickness of the bushing 200 is less than or equal to the distance from the junction of the sub-head polished rod 120 and the upper chamfer 150 to the collar 600. In the bushing 200, a space formed between the bushing 200 and the head lower polish rod 120, the screw upper polish rod 130, and the retainer 600 constitutes a card slot 500. The retainer ring 600 can be formed together with the thread of the external thread rod 140 of the bolt 100 during thread rolling, and the bushing 200 can be assembled and sleeved in the slot 500 in advance in a combined thread rolling manner, so that the bushing 200 can move up and down in the slot 500 without being detached, and the action of pre-placing the bushing 200 during assembly is omitted. In the embodiment, the outer diameter of the retainer ring 600 is 8.50-8.60mm, the top width is 0.10-0.15mm, the bottom width is 0.80-0.90mm, and the center of the retainer ring 600 is 11.00-11.20mm away from the bottom surface of the wheel rim; the bushing 200 has a thickness of 4.40-4.50mm.

As shown in fig. 12, the lower mounting counterbore 310 of the lower plate 300 is composed of a communicating upper counterbore 311 and a lower counterbore 312, the lower counterbore 312 being used to give way to the collar 600.

During the tightening assembly, the bolt 100 is screwed downwards into the internally threaded hole 320 of the lower plate 300; when the lower end of the flange head 110, which is tightening the bolt 100, is completely fitted against the upper end surface of the upper plate 400, the bush 200 is filled down over the collar 600 and extended up out of the card slot 500. As shown in fig. 12 to 14, when the collar 600 is added to the bolt 100, the bush 200 is pressed and deformed by the interference of the collar 600, and is difficult to extend downward to the thread of the male screw 140 of the bolt 100, so that the bush 200 is prevented from entering the thread bottom diameter of the male screw 140 to cause thread jamming when the bolt 100 is tightened.

While the foregoing description shows and describes the preferred embodiments of the present invention, it is to be understood that the invention is not limited to the forms disclosed herein, but is not intended to be exhaustive or to exclude other embodiments and may be used in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. But that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention, which is to be limited only by the claims appended hereto.

Claims (3)

1. A loose-proof combined fastener structure is characterized by comprising a bolt (100), a bushing (200), a lower plate (300) and an upper plate (400);

the lower plate (300) and the upper plate (400) are correspondingly provided with communicated mounting counterbores, and the mounting counterbores comprise a lower mounting counterbore (310) arranged in the lower plate (300) and an upper mounting counterbore (410) arranged in the upper plate (400); an internal threaded hole (320) is arranged below the lower mounting counter bore (310);

the bolt (100) sequentially comprises a flange head (110), a head lower polish rod (120), a screw rod upper polish rod (130) and an external thread rod (140);

a bushing (200) having an inner diameter greater than a nominal outer diameter of the externally threaded rod (140) and less than a diameter of the sub-head polish rod (120); the outer diameter of the bushing (200) is smaller than the aperture of the lower mounting counter bore (310) and smaller than the aperture of the mounting counter bore (410) on the upper plate (400); in the bushing (200), a clamping groove (500) is formed by the bushing (200) and spaces formed among the head lower polish rod (120), the screw rod upper polish rod (130) and the mounting counter bore;

in the screwing assembly process, the bushing (200) is placed in the lower mounting counter bore (310) and the upper mounting counter bore (410), the bolt (100) penetrates through the bushing (200) and is screwed downwards in the internally threaded hole (320) of the lower plate (300); when the lower end of the flange head (110) of the bolt (100) is screwed down and is tightly attached to the upper end face of the upper plate (400) to finish assembly, the bushing (200) is filled into the clamping groove (500).

2. A locking combined fastener structure is characterized by comprising a bolt (100), a bushing (200), a lower plate (300) and an upper plate (400);

the lower plate (300) and the upper plate (400) are correspondingly provided with communicated mounting counterbores, and the mounting counterbores comprise a lower mounting counterbore (310) arranged in the lower plate (300) and an upper mounting counterbore (410) arranged in the upper plate (400); the lower mounting counter bore (310) consists of an upper counter bore (311) and a lower counter bore (312) which are communicated, and an internal threaded hole (320) is arranged below the lower counter bore (312); the inner diameter of the upper counter bore (311) is larger than that of the lower counter bore (312); the bolt (100) sequentially comprises a flange head (110), a head lower polish rod (120), a screw rod upper polish rod (130) and an external thread rod (140); a clamping ring (600) is arranged at the joint of the external thread rod (140) and the screw rod polish rod (130), and the outer diameter of the clamping ring (600) is larger than the inner diameter of the bushing (200) and smaller than the inner diameter of the sinking hole (312) of the lower plate (300); and the outer diameter of the collar (600) is larger than the nominal outer diameter of the external thread rod (140); the lower head polish rod (120) is in transition connection with the upper screw rod (130) through an upper end chamfer (150);

a bushing (200) having an inner diameter less than a diameter of the sub-head polish rod (120); the outer diameter of the bushing (200) is smaller than the aperture of the upper mounting counter bore (410) and smaller than the aperture of the upper counter bore (311); in the bushing (200), a clamping groove (500) is formed by the space formed among the bushing (200), the polish rod under the head (120), the polish rod on the screw rod (130) and the mounting counter bore;

a bushing (200), the bushing (200) having an inner diameter less than the diameter of the sub-head polish rod (120); the outer diameter of the bushing (200) is smaller than the aperture of the upper mounting counter bore (410) and smaller than the aperture of the upper counter bore (311); the thickness of the bushing (200) is less than or equal to the distance from the joint of the under-head polished rod (120) and the upper end chamfer (150) to the clamping ring (600); in the bushing (200), a clamping groove (500) is formed by the space formed among the bushing (200), the polish rod under the head (120), the polish rod on the screw rod (130) and the mounting counter bore;

in the screwing and assembling process, the bolt (100) is screwed downwards in the internal thread hole (320) of the lower plate (300); when the lower end of the flange head (110) of the bolt (100) is tightened to be attached to the upper end surface of the upper plate (400), the bush (200) is filled downward above the collar (600) and extends upward to form a slot (500).

3. An anti-loose combination fastener structure as claimed in claim 1 or 2, characterized in that the bush (200) is a nylon bush or an aluminum bush.

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