TWI557332B - Screw fastener and screw fastener assembly using the same - Google Patents

Description

Thread fastening assembly and its screw

The present invention relates to a fastening assembly, and more particularly to a threaded fastening assembly and a screw thereof.

Mechanical assembly is an important process in mechanical manufacturing that ultimately determines the quality of mechanical products. Even if all the qualified parts are not properly assembled, they often fail to form a quality qualified product. When assembling, it is usually necessary to screw two or more parts together by a screw fastening component such as a screw or a bolt. Generally, the component to be assembled is provided with a threaded hole, and a threaded fastener such as a screw or a bolt is provided with an externally threaded connecting portion, and the externally threaded connecting portion and the thread on the threaded fastener are assembled. The holes are screwed together to assemble the parts to be assembled together. However, components assembled only by screwing are prone to looseness in a vibrating environment. If the manufacturing precision of each part and threaded fastener is low, it is easy to cause a weak connection.

In view of the above, it is necessary to provide a screw fastening assembly that is securely fastened and reliable and a screw thereof.

A screwing member comprising a head and a screw formed on the head, the screw is provided with a threaded portion at an outer circumference, and an outer diameter of the screw extends from one end of the head to the The screw is gradually reduced from the direction of one end of the head, The screwing member penetrates through the central axis through the center hole, and the central hole penetrates the head and the screw, and the side wall of the center hole is inclined with respect to the axis of the screw. An expansion gap is defined in the threaded portion, and the expansion gap communicates with the central hole and penetrates the threaded portion away from one end of the head, so that the threaded portion can be contracted along its own radial direction under external force Or expansion.

A thread fastening assembly comprising the screw member as described in the above item and a ferrule mating with the screw member, the ferrule for inserting into the center hole to push the center The side wall of the hole enables the threaded portion to contract or expand in its own radial direction.

In the screw fastening assembly of the embodiment of the invention, the threaded portion of the screwing member is provided with an expansion gap, so that the thread portion can be contracted or expanded in the radial direction by the external force. The thread fastening component firstly screws the screwing component with the component when tightening the plurality of components to be assembled, and then expands the threaded portion radially by the ferrule to closely fit or interference fit with the component, thereby enabling the plural The parts are securely assembled together by a threaded fastening assembly and are not easily loosened.

100‧‧‧Threaded fastening components

10‧‧‧ ferrule

30,230‧‧‧ screw fittings

32‧‧‧ head

34‧‧‧ screw

341‧‧‧Threaded Department

36,236‧‧‧ center hole

38,238‧‧‧Expansion gap

200‧‧‧ parts

210‧‧‧Threaded holes

1 is a front elevational view of a threaded fastening assembly according to an embodiment of the present invention at a first viewing angle.

2 is a front elevational view of the screwing member of the threaded fastening assembly of FIG. 1 in a second viewing angle.

Figure 3 is a plan view of the screwing member of the threaded fastening assembly of Figure 2.

4 is a cross-sectional view of the screwing member of the screw fastening assembly of FIG. 3 taken along line IV-IV.

Fig. 5 is a schematic view showing the screwing member of the screw fastening assembly shown in Fig. 2 in a screwed state.

Figure 6 is a schematic view of the threaded fastening assembly of Figure 1 in a secured state.

Fig. 7 is a plan view showing a screwing member of a screw fastening assembly according to another embodiment of the present invention.

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

It should be noted that when a component is referred to as being "fixed" to another component, it can be directly on the other component or the component can be present. When a component is considered to be "connected" to another component, it can be directly connected to another component or a central component can be present at the same time. When a component is considered to be "set to" another component, it can be directly disposed on the other component or the central component may be present at the same time. The terms "vertical", "level", "left", "right" and the like are used herein for the purpose of illustration only.

All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to the invention. The terminology used in the description of the present invention is for the purpose of describing particular embodiments, and is not intended to limit the invention. The term "and/or" used herein includes any and all combinations of one or more of the associated listed items.

Referring to Figure 1, a threaded fastening assembly 100 is provided for assembling multiple components to be assembled together. The threaded fastening assembly 100 includes a ferrule 10 and a threaded member 30 for mating with the ferrule 10. The screw member 30 has a substantially hollow structure and is used for The plurality of parts to be assembled are threaded and screwed with the plurality of parts to be assembled. The ferrule 10 is inserted into the screwing member 30 to increase the outer diameter of the screwing member 30, so that the threaded fastening assembly 100 is closely matched with the plurality of parts to be assembled, thereby firmly fixing the plurality of parts to be assembled. Assembled together.

In the present embodiment, the ferrule 10 is substantially in the shape of a cylindrical rod, and the screwing member 30 is a hexagonal head bolt.

The screw member 30 includes a head portion 32 and a screw 34 formed at one end of the head portion 32.

Specifically in the illustrated embodiment, the head 32 is a hexagonal bolt head. It will be appreciated that the head 32 can be a hexagonal head, a rounded head or other shaped bolt head.

The screw 34 is formed at one end of the head 32, and a threaded portion 341 is formed thereon, and the threaded portion 341 is screwed with the plurality of parts to be assembled. In the present embodiment, the screw 34 as a whole has a substantially truncated rod shape, and its outer diameter gradually decreases in a direction away from the head portion 32. Specifically, the outer diameter of the screw 34 near one end of the head 32 is greater than the outer diameter of the screw 34 away from one end of the head 32. The threaded portion 341 is formed on the outer circumference of the screw 34 and extends from a substantially central position of the screw 34 to one end of the screw 34 away from the head 32.

Referring to FIG. 2 to FIG. 4 simultaneously, the screwing member 30 is provided with a central hole 36 extending through the axial direction thereof, and the screw 34 is provided with an expansion gap 38 on the threaded portion 341.

Specifically, in the illustrated embodiment, the central bore 36 is generally a truncated bore that extends through the head 32 of the screw member 30 and the screw 34. The center hole 36 is for receiving the ferrule 10. The aperture of the central hole 36 gradually decreases from the head 32 to the threaded portion 341, and the maximum aperture is larger than the diameter of the ferrule 10, and the minimum aperture is smaller than the diameter of the ferrule 10, so that the central hole 36 securely receives the ferrule 10. .

The expansion gap 38 is opened by the threaded portion 341 near one end of the head 32 and along the screw 34 The axial direction extends to the threaded portion 341 away from one end of the head and communicates with the central bore 36. In the present embodiment, the number of expansion gaps 38 is two. The two expansion gaps 38 are respectively disposed on opposite sides of the threaded portion 341, thereby dividing the threaded portion 341 into two lobes. The expansion gap 38 provides a certain elasticity to the threaded portion 341, and the two lobes of the threaded portion 341 can be moved closer to each other or away from each other by the external force, so that the outer diameter of the threaded portion 341 is correspondingly reduced or increased.

In the present embodiment, the expansion gap 38 is substantially an elongated groove. The width of the expansion gap 38 gradually decreases from a direction near one end of the head 32 to a direction in which the expansion gap 38 is away from one end of the head 32. Specifically, the width of the expansion gap 38 near one end of the head 32 is greater than the expansion gap 38 away from one end of the head 32. When the threaded portion 341 is radially expanded by an external force, the width of the expansion gap 38 away from one end of the head 32 increases.

Since the diameter of the ferrule 10 is larger than the minimum aperture of the center hole 36, when the ferrule 10 is inserted into the center hole 36, the end of the ferrule 10 abuts against the inner wall of the center hole 36. As the ferrule 10 continues to be inserted, the ferrule 10 is pushed down, and the two lobes of the threaded portion 341 divided by the expansion gap 38 are gradually opened and moved away from each other, thereby increasing the outer diameter of the threaded portion 341.

Referring to FIG. 5 and FIG. 6 simultaneously, the screw fastening assembly 100 of the embodiment of the present invention is applied to the locking and fastening of the component 200. For convenience of description, the present specification uses a component 200 as an example for illustration. Specifically, the component 200 is provided with a threaded hole 210 for engaging with the threaded portion 341. When the threaded fastening assembly 100 is used, first, the screwing member 30 is screwed into the threaded hole 210, and the threaded portion 341 is screwed with the threaded hole 210. Then, the ferrule 10 is inserted into the center hole 36. Under the urging of the ferrule 10, the threaded portion 341 is radially expanded, so that the thread of the threaded portion 341 is tightly fitted or interference fit with the thread of the threaded hole 210, so that the threaded fastening assembly 100 is firmly assembled with the part 200. Together . It can be understood that if the number of parts 200 is two or more, the thread fastening group is made. The piece 100 is inserted into the plurality of parts 200, and the plurality of parts 200 are simultaneously mated or interference fit with the threaded fastening assembly 100 such that the plurality of parts 200 are securely assembled together by the threaded fastening assembly 100.

In the screw fastening assembly 100 of the embodiment of the present invention, the threaded portion 341 of the screw member 30 is provided with an expansion gap 38, so that the thread portion 341 can be contracted or expanded in the radial direction by itself under the action of an external force. When tightening the plurality of parts 200 to be assembled, the threaded fastening assembly 100 firstly screws the screwing member 30 with the part 200, and then expands the threaded portion 341 radially by the ferrule 10 to closely fit or pass the part 200. The mating fit enables the plurality of parts 200 to be securely assembled together by the threaded fastening assembly 100 and is less prone to loosening. In addition, since the center hole 36 is substantially a circular hole, the hole diameter thereof gradually decreases from the head 32 to the thread portion 341, and the insertion depth of the ferrule 10 in the center hole 36 determines the degree of expansion of the thread portion 341, so that The threaded portion 341 can be mated with a threaded bore 210 having a manufacturing tolerance such that the threaded fastening assembly 100 can be adapted to produce a less accurate part 200.

Further, in the present embodiment, the screw member 30 is made of carbon steel. It will be appreciated that the screw member 30 can be made of stainless steel, brass or other metallic material so that the screw member 30 of the present embodiment can be used to fasten metal-made parts. It will also be appreciated that the screw member 30 can be made of other materials to accommodate different materials to be assembled or to meet different needs. For example, when the part to be assembled is a plastic product, the screwing member 30 can be made of plastic correspondingly. When the fastening connection of the component to be assembled requires certain toughness and certain rigidity, the screwing member 30 can also be made of plastic.

It can be understood that the number of the expansion gaps 38 on the threaded portion 341 can be one or plural to The threaded portion 341 can be contracted or expanded in its own radial direction by an external force.

It will be appreciated that the shape of the central bore 36 is not limited to the truncated bore structure described above, which may be designed in other configurations. For example, the central aperture 36 can be a polygonal aperture having a sloped sidewall and the aperture of the central aperture 36 is tapered from the head 32 to the threaded portion 341 such that the ferrule 10 is inserted into the central aperture 36 to resist the center. The side walls of the holes 36 allow the threaded portion 341 to contract or expand radially in its own direction.

Please refer to FIG. 7 at the same time. FIG. 7 shows a top view of the screw member 230 according to another embodiment of the present invention. In the present embodiment, the center hole 236 is a quadrangular hole whose hole diameter gradually decreases from the head 32 to the threaded portion. The number of expansion gaps 238 is four, and the four expansion gaps 238 are respectively formed on the four edges of the center hole 236. It can be understood that the central hole 236 can be a triangular hole, a pentagonal hole, a hexagonal hole, other polygonal holes or irregular holes, etc., and the description is not described in detail herein.

It can be understood that the shape of the ferrule 10 is not limited to the cylindrical rod structure described above, and it can be designed as another structure, and when the ferrule 10 is inserted into the center hole 36, the ferrule 10 can push against the center hole 36. The side walls are such that the threaded portion 341 can be contracted or expanded in its own radial direction.

For example, when the center hole 236 is a truncated hole, the ferrule 10 can be designed as a truncated rod shape, and the minimum diameter of the ferrule 10 is smaller than the maximum diameter of the center hole 36 and larger than the minimum aperture of the center hole 36. Alternatively, when the central hole 236 is a circular hole, the ferrule 10 can be designed as a triangular prism, a quadrangular prism, a pentagonal prism, other polygonal prisms or irregular prisms, etc., so that the minimum outer diameter of the ferrule 10 is smaller than that of the central hole 36. The maximum aperture is greater than the minimum aperture of the central aperture 36 such that when the ferrule 10 is inserted into the central aperture 36, the ferrule 10 can push against the sidewall of the central aperture 36, thereby enabling the threaded portion 341 to contract or expand radially in its own direction.

For another example, the shape of the ferrule 10 can be designed to be the same shape as the hole shape of the center hole 36, so that when the ferrule 10 is inserted into the center hole 36, the outer peripheral wall of the ferrule 10 closely abuts against the center hole 36. The side walls are such that the tension received by the threaded portion 341 is relatively uniform. When the central hole 36 is a triangular hole, a pentagonal hole, other polygonal holes or irregular holes, the ferrule 10 can be correspondingly designed as a triangular prism, a quadrangular prism, a pentagonal prism, other polygonal prisms or irregular prisms. Even, the shape of the ferrule 10 may not conform to the shape of the center hole 36, and its shape may be designed to have a shape different from that of the center hole 36, and only when the ferrule 10 is inserted into the center hole 36, the ferrule 10 can push against the side wall of the center hole 36, so that the thread portion 341 can be contracted or expanded in the radial direction of itself.

It will be appreciated that the outer shape of the screw 34 is not limited to the truncated cone shape described above, and may be provided in the shape of a cylindrical rod or other geometric shape.

It can be understood that the screwing member 30 can be a screw, a stud, or the like, and other threaded fasteners provided with external threads.

It will be appreciated that the shape of the expansion gap 38 may not be limited to the elongated strips described above, which may be designed as slots of other shapes. For example, the expansion gap 38 may be designed to bend or bend the through groove formed in the threaded portion 341, and the expansion gap 38 is passed through one end of the threaded portion 341 to ensure that the threaded portion 341 can be radially contracted by itself under the action of an external force or Expand it.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by persons skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims.

30‧‧‧ screw fittings

32‧‧‧ head

34‧‧‧ screw

341‧‧‧Threaded Department

Claims (8)

A screwing member comprising a head and a screw formed on the head, the screw is provided with a threaded portion on the outer circumference, and the improvement is that the outer diameter of the screw is from the head One end extends to a direction in which the screw is gradually away from one end of the head, and the screw member penetrates through a central hole penetrating in a direction of the axis thereof, the center hole penetrating the head and the screw, a sidewall of the center hole is inclined with respect to an axis of the screw member; the thread portion is provided with an expansion gap, and the expansion gap communicates with the center hole and penetrates the thread portion away from one end of the head portion, The threaded portion can be contracted or expanded in its own radial direction by an external force. The screwing member according to claim 1, wherein the expansion gap is opened on an outer peripheral wall of the threaded portion along an axial direction of the screwing member, and a width of the expansion gap is expanded from the expansion The gap extends closer to one end of the head to a direction in which the expansion gap is away from one end of the head. The screw member of claim 1, wherein an aperture of the center hole gradually decreases from a direction in which the head extends to the threaded portion. The screwing member according to claim 3, wherein the central hole is any one of the following: a circular hole, a triangular hole, a quadrangular hole, a pentagonal hole, a hexagonal hole, and eight a polygonal hole; the screwing member is any one of the following: a bolt, a screw, a stud. A threaded fastening assembly, the improvement comprising the screwing member according to any one of claims 1 to 4, and a ferrule mating with the screwing member, the ferrule The utility model is arranged to be inserted into the central hole to push against the side wall of the central hole, so that the threaded portion can be contracted or expanded in the radial direction of itself. The thread fastening assembly of claim 5, wherein the minimum outer diameter of the ferrule It is larger than the smallest aperture of the central aperture and smaller than the largest aperture of the central aperture. The thread fastening assembly of claim 6, wherein the ferrule is in any one of the following: a cylindrical rod, a round table rod, a triangular prism, a quadrangular prism, a pentagonal prism, a hexagonal prism, Eight prisms. The thread fastening assembly of claim 6, wherein the shape of the ferrule is the same as the shape of the hole of the center hole, and when the ferrule is inserted into the center hole, The peripheral wall of the ferrule closely abuts against the side wall of the center hole.