CN211314795U - Screw nail - Google Patents

Abstract

The utility model belongs to the technical field of machine part, concretely relates to screw. The screw includes: a nut; the screw rod, the one end of screw rod with the nut is connected, the screw rod outside is equipped with the screw thread, the other end of screw rod is seted up along the axial extension's of screw rod blind hole. According to the utility model discloses a screw sets up the blind hole along the axial extension of screw rod at the tip of screw rod, can reduce the rigidity of screw rod, and the screw rod screw in is produced the pretightning force by the connector, and the pretightning force makes the one end of screw rod area blind hole and is followed the radial deformation of screw rod by the connector to reduce by the stress of connector, reduce by the axial displacement of connector along the screw rod, avoid causing the leakage of gas or liquid, perhaps cause by the unable condition of assembling of connector.

Description

Screw nail

Technical Field

The utility model belongs to the technical field of machine part, concretely relates to screw.

Background

Parts such as cylinder head, main bearing cap or crankcase are connected with the engine body through screws mostly, and great pretightning force is produced when screws and screw thread fit, thereby make near the screw tail end by the stress increase of connector, lead to being taken place axial deformation by the connector, and then cause the leakage of gas or liquid, perhaps by the unable problem of assembling of connector.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the problem that the axial deformation is easy to occur by the connector when the screw is adopted for connection. The purpose is realized by the following technical scheme:

the utility model provides a screw, screw includes: a nut; the screw rod, the one end of screw rod with the nut is connected, the screw rod outside is equipped with the screw thread, the other end of screw rod is seted up along the axial extension's of screw rod blind hole.

According to the utility model discloses the screw sets up the blind hole along the axial extension of screw rod at the tip of screw rod, can reduce the rigidity of screw rod, and the screw rod screw in is produced the pretightning force by the connector, and the pretightning force makes the one end of screw rod area blind hole and is followed the radial deformation of screw rod by the connector to reduce the stress by the connector, reduce the axial displacement along the screw rod by the connector, avoid causing the leakage of gas or liquid, perhaps cause by the unable condition of assembling of connector.

In addition, according to the utility model discloses the screw, can also have following technical characterstic:

in some embodiments of the present invention, the cross-sectional dimension of the blind hole is gradually reduced from the open end of the blind hole to the blind end of the blind hole.

In some embodiments of the present invention, the blind hole extends from the end of the screw away from the nut to a position where the thread ends.

In some embodiments of the present invention, the nut is a hexagonal nut.

In some embodiments of the present invention, the blind hole is coaxially disposed with the screw.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like parts are designated by like reference numerals throughout the drawings. In the drawings:

fig. 1 is a schematic view of an overall structure of a screw according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a screw and a connected body according to an embodiment of the present invention.

The reference symbols in the drawings denote the following:

100: a first connected body;

200: a second connected body;

10: a nut;

20: screw, 21: screw thread, 22: and (4) blind holes.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof.

Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

For convenience of description, spatially relative terms, such as "inner", "outer", "lower", "below", "upper", "above", and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" can include both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

As shown in fig. 1 and 2, an embodiment of the present invention provides a screw, including: the screw cap comprises a screw cap 10 and a screw rod 20, wherein one end of the screw rod 20 is connected with the screw cap 10, threads 21 are arranged on the outer side of the screw rod 20, and a blind hole 22 extending along the axial direction of the screw rod 20 is formed in the other end of the screw rod 20.

According to the utility model discloses the screw, set up the blind hole 22 along the axial extension of screw rod at the tip of screw rod 20, can reduce the rigidity of screw rod 20, screw rod 20 screw in second is by connector 200 and first by connector 100 production pretightning force, the pretightning force makes the screw rod 20 take the one end of blind hole 22 and first by connector 100 along the radial deformation of screw rod 20 to reduce the stress of first by connector 100, reduce the axial displacement of first being connected body 100 along screw rod 20, avoid causing the leakage of gas or liquid, or cause the first condition that is connected body 100 or second by connector 200 unable assembly.

The utility model discloses an in some embodiments, through the simulation verification, set up blind hole 22 at the tail end of screw, can effectively promote first by connector 100 high week fatigue factor of safety in the deep hole position.

In some embodiments of the present invention, the cross-sectional dimension of the blind hole 22 decreases from the open end of the blind hole 22 to the blind end of the blind hole 22. The opening end of the blind hole 22 is arranged at one end of the screw rod 20 far away from the nut 10, the section size of the blind hole 22 at the opening end is the largest, the wall thickness of the screw rod 20 at the end is the smallest, the screw rod 20 at the end can generate large deformation, the screw is screwed into the second connected body 200 and the first connected body 100, and under the action of large pre-tightening force, the screw rod 20 at the end generates large deformation without damaging the screw.

In some embodiments of the present invention, blind hole 22 is shaped as a "bullet".

In some embodiments of the present invention, the blind hole 22 is formed by the screw 20, which is far away from the nut 10, the one end of the blind hole 22 extends to the position where the thread 21 ends, the length of the blind hole 22 is the same as the length of the thread 21, when the screw 20 is screwed into the second connected body 200 and the first connected body 100, all the parts of the screw 20 with the thread 21 can both generate a certain radial deformation under the action of stress, thereby reducing the radial stress of the threaded connection part of the screw and prolonging the service life of the screw.

In some embodiments of the present invention, the nut 10 is a hexagonal nut to facilitate the use of a tool to screw the screw into the second connected body 200 and the first connected body 100.

The utility model discloses an in other embodiments, the cross-section of blind hole 22 is for circular and blind hole 22 coaxial seting up on screw rod 20, and one section screw rod 21 of seting up blind hole 22 is the same at the circumference upper wall thickness in same cross-section, causes the uneven emergence of screw rod 21 atress to damage because of the wall thickness difference when avoiding receiving the pretightning force.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (4)

1. A screw, comprising:

a nut;

one end of the screw is connected with the nut, threads are arranged on the outer side of the screw, and a blind hole extending along the axial direction of the screw is formed in the other end of the screw;

the section size of the blind hole is gradually reduced from the opening end of the blind hole to the blind end of the blind hole.

2. The screw of claim 1, wherein the blind bore extends from the end of the shank remote from the nut to a position where the thread terminates.

3. The screw of claim 1, wherein the nut is a hex-type nut.

4. The screw according to any one of claims 1 to 3, wherein the blind bore is disposed coaxially with the threaded shank.

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