CN220218242U - Pre-tightening sleeve of double-end stud - Google Patents

Abstract

The utility model belongs to the technical field of the pre-tightening sleeve, especially, relate to stud pre-tightening sleeve, including the stud connector body, be provided with the tool joint body on the stud connector body, be provided with the cylindrical screw counter bore on the stud connector body, be provided with the tool connecting hole on the tool joint body, the central axis of cylindrical screw counter bore and the central axis coincidence of tool connecting hole are provided with the pressure balance hole on the stud connector body, pressure balance hole intercommunication cylindrical screw counter bore and external world, and then stud screw in resistance increases when avoiding stud screw in stud connector body's cylindrical screw in counter bore, also avoided the sleeve to back to unscrew because when rising when leading to sleeve and stud contact surface's frictional force increase and then the phenomenon that easily leads to screwing in moment reduction when the sleeve that leads to unscrews of blind indoor atmospheric pressure.

Description

Pre-tightening sleeve of double-end stud

Technical Field

The application belongs to the technical field of pre-tightening sleeves, and particularly relates to a stud pre-tightening sleeve.

Background

The fixing bolts of the side crankcase cover plate, the cam shaft case cover plate, the main bearing and the like of the ship engine are used in a large amount, so that the efficiency of screwing the stud into the main body is required to be improved in the process of assembling the engine, the moment of screwing the stud into the main body is required to be ensured, electric or pneumatic tools are used in a large amount on the engine assembly line for improving the assembling efficiency and the assembling consistency of the stud, a special mounting sleeve for screwing the stud into the main body is required to be designed independently by assisting the electric or pneumatic tools, and the mounting efficiency and the mounting quality of the stud are directly influenced by the reasonable design of the pre-screwing sleeve of the stud.

One of the current sleeves is in the form of figure 1 of the drawings of the specification, which has the following drawbacks:

the method has the following defects: the interface of the sleeve and the stud is unguided, and the requirement of the sleeve and the stud for quick positioning is not met.

And the second disadvantage is that: the friction moment between the stud and the top surface of the sleeve is large, and the stud is easy to be screwed into the main body to reduce the pre-tightening moment or directly unscrew in the reverse direction when the sleeve is reversely rotated and withdrawn.

And the third disadvantage is: and due to the design of no air pressure balance, the screwing-in resistance of the stud is increased when the stud is screwed into the main body, the sleeve is reversely screwed out, and the friction force of the contact surface of the sleeve and the stud is increased when the air pressure in the blind chamber is increased, so that the screwing-out torque of the sleeve is easily reduced.

Disclosure of Invention

The present application provides a stud pre-tightening sleeve for solving the above problems.

The utility model provides a purpose provides a stud pretension sleeve, this application sets up pressure balance hole on the stud joint body, and stud screw in resistance increases when can avoiding stud screw in stud joint body's cylindrical thread counter bore like this, has also avoided the sleeve to back to screw out because the increase of the frictional force that leads to sleeve and stud contact surface when the interior atmospheric pressure of blind chamber risees and then easily leads to the phenomenon that the moment of screwing up reduces when the sleeve that leads to screws out.

In order to achieve the purpose of the application, the technical scheme of the application is as follows:

the stud pre-tightening sleeve comprises a stud connector body, wherein a tool connector body is arranged on the stud connector body, a cylindrical threaded counter bore is formed in the stud connector body, a tool connecting hole is formed in the tool connector body, the central axis of the cylindrical threaded counter bore is coincident with the central axis of the tool connecting hole, a pressure balance hole is formed in the stud connector body, and the pressure balance hole is communicated with the cylindrical threaded counter bore and the outside.

Further, the central axis of the pressure balance hole is arranged along the radial direction of the stud joint body, and the pressure balance hole is communicated with the upper end of the cylindrical threaded counter bore.

Further, the end of the cylindrical threaded counter bore is an expansion cavity, the expansion cavity is positioned in the stud joint body, and the pressure balance hole is connected with the expansion cavity.

Further, a through hole is formed in the tail end of the stud connector body, a jacking block is arranged in the through hole, a ball head is arranged at the head end of the jacking block, and the ball head is located in the cylindrical threaded counter bore.

Further, the head end of the cylindrical threaded counter bore is a guide cavity, and the guide cavity is positioned on the stud connector body.

Further, the guide cavity is a conical cavity.

Further, extending from the head end to the tail end, the guide lumen has a reduced diameter.

Further, the tail end of the double-end stud connector body is provided with a clamping block, the head end of the tool connector body is provided with a clamping groove, the clamping block is inserted into the clamping groove, and the tool connector body is fixedly connected with the double-end stud connector body.

Compared with the prior art, the beneficial effects of this application are:

1. the pressure balance hole is formed in the stud connector body, so that the increase of the screw-in resistance of the stud when the stud is screwed into the cylindrical threaded counter bore of the stud connector body can be avoided, and in addition, the phenomenon that the screw-in torque is reduced when the sleeve is screwed out due to the fact that the friction force of the contact surface of the sleeve and the stud is increased when the air pressure in a blind chamber is increased and the sleeve is further caused is avoided.

2. This application has increased sleeve and stud's direction chamber structure, and the head end of direction chamber structure is bigger than stud to realize sleeve and stud's quick location and be connected, improved stud's the efficiency of screwing in stud joint body.

3. According to the method, the ball head design is added in the cylindrical threaded counter bore, the end face contact between the end face of the stud and the tail end of the cylindrical threaded counter bore is optimized to be point contact, and the influence of the reduction of the pre-tightening torque when the stud is screwed into the stud connector body is avoided when the sleeve is reversely withdrawn.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application.

FIG. 1 is a schematic diagram of a prior art structure;

FIG. 2 is a schematic view of the internal structure of the present application;

fig. 3 is a schematic structural view of the stud connector of the present application.

In the figure:

1. the double-end stud connector comprises a double-end stud connector body 2, a top block 3, a tool connector body 4, a pressure balance hole 5, a ball head 6 and a guide cavity.

Detailed Description

The present application is further described below with reference to the drawings and examples.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

In the present application, the terms such as "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "side", "bottom", etc. refer to the directions or positional relationships based on the directions or positional relationships shown in the drawings, and are merely relational terms, which are merely determined for convenience in describing the structural relationships of the various components or elements of the present application, and do not denote any one component or element of the present application, and are not to be construed as limiting the present application.

Example 1

The embodiment is a stud pre-tightening sleeve, which is mainly used for improving the problems of no guide, large contact friction, no air pressure balance and the like existing in the existing sleeve, and mainly comprises two parts, namely a stud connector body and a tool connector body, wherein the tool connector body is arranged on the stud connector body, specifically, a clamping block is arranged at the tail end of the stud connector body, a clamping groove is formed in the head end of the tool connector body, the clamping block is inserted into the clamping groove, the tool connector body and the stud connector body are fixedly connected, and the fixing connection mode adopts welding connection to realize the fixation of the two parts.

In this embodiment, the cylindrical thread counter bore has been seted up on the stud connector body, be provided with the instrument connecting hole on the instrument connector body, the central axis of cylindrical thread counter bore and the central axis coincidence of instrument connecting hole, for solving the problem of prior art's no atmospheric pressure balance, this embodiment has seted up pressure balance hole on the stud connector body, quantity 1 or 2 can all, other quantity also regard as in the scope of protection of this application, pressure balance hole intercommunication cylindrical thread counter bore and external world, the external world refers to telescopic outside, as more specific embodiment, the central axis of pressure balance hole of this embodiment is along stud connector body radial arrangement, pressure balance hole and cylindrical thread counter bore upper end intercommunication, cylindrical thread counter bore end is for expanding the chamber, it is internal that the chamber is located stud connector to expand the chamber to expand the pressure balance hole, expand the chamber in this embodiment, the chamber is flat cylindrical cavity structure, the setting up of pressure balance hole can avoid stud screw in stud when the counter bore of stud connector body, stud screw in resistance increase, also avoid leading to the phenomenon of screw in when leading to sleeve and the easy friction force that increases the contact surface when leading to the sleeve to screwing out when the blind indoor atmospheric pressure increases and then the moment of screwing out and reduce.

In order to solve the problem that the contact friction force is big that prior art exists, the through-hole has been seted up at stud joint body end to this embodiment, install the kicking block in the through-hole, in this embodiment, the length of kicking block is less than the length of through-hole, and kicking block adopts interference fit with the through-hole, make the jack-post fix in the through-hole and then fix on stud joint body, the head end of kicking block has the bulb, the bulb is located the cylinder thread counter bore, when stud inserts and makes stud arrange in the cylinder thread counter bore, the terminal surface contact of the terminal end of stud and cylinder thread counter bore is the point contact, when the sleeve is in the back-out, the influence that the pre-tightening moment reduces when having avoided the stud to screw in the stud joint body.

In order to solve the problem that the stud is not easy to insert into the cylindrical threaded counter bore, the head end of the cylindrical threaded counter bore is provided with a guide cavity, the guide cavity is positioned on the stud connector body, and more particularly, the guide cavity is a conical cavity. As a specific structure of the conical cavity, the conical cavity extends from the head end to the tail end, the diameter of the guide cavity is reduced, and the sleeve can rapidly position the double-head double bolts.

The foregoing is merely a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and variations may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

While the foregoing description of the embodiments of the present application has been presented in conjunction with the drawings, it should be understood that it is not intended to limit the scope of the application, but rather, it is intended to cover all modifications or variations which may be resorted to without undue burden to those skilled in the art, having the benefit of the present application.

Claims (8)

1. The double-end stud pre-tightening sleeve is characterized by comprising a double-end stud connector body, wherein a tool connector body is arranged on the double-end stud connector body, a cylindrical threaded counter bore is arranged on the double-end stud connector body, a tool connecting hole is arranged on the tool connector body, and the central axis of the cylindrical threaded counter bore is coincident with the central axis of the tool connecting hole;

the double-end stud connector body is provided with a pressure balance hole, and the pressure balance hole is communicated with the cylindrical threaded counter bore and the outside.

2. The stud pre-tightening sleeve of claim 1, wherein the central axis of the pressure balance hole is radially disposed along the stud connector body, the pressure balance hole being in communication with the upper end of the cylindrical threaded counterbore.

3. The stud pre-tightening sleeve of claim 2, wherein the cylindrical threaded counterbore terminates in an enlarged cavity within the stud adapter body, the pressure balance bore connecting the enlarged cavity.

4. The stud pre-tightening sleeve of claim 1, wherein a through hole is formed in the tail end of the stud connector body, a jacking block is arranged in the through hole, a ball head is arranged at the head end of the jacking block, and the ball head is positioned in the cylindrical threaded counter bore.

5. The stud pre-tightening sleeve of claim 1, wherein the cylindrical threaded counterbore head end is a pilot cavity located on the stud adapter body.

6. The stud pre-tightening sleeve of claim 5, wherein the guide cavity is a tapered cavity.

7. The stud pre-tightening sleeve of claim 6, wherein the guide cavity is reduced in diameter extending from the head end to the tip end.

8. The stud pre-tightening sleeve of claim 1, wherein the end of the stud connector body is provided with a clamping block, the head end of the tool connector body is provided with a clamping groove, the clamping block is inserted into the clamping groove, and the tool connector body is fixedly connected with the stud connector body.