KR101921149B1

KR101921149B1 - Torque control bolt

Info

Publication number: KR101921149B1
Application number: KR1020150189826A
Authority: KR
Inventors: 배보경; 박홍민; 김희섭
Original assignee: 배보경; 박홍민; 김희섭
Priority date: 2015-12-07
Filing date: 2015-12-30
Publication date: 2018-11-22
Also published as: KR20170067115A

Abstract

A torque control bolt according to the present invention includes: a ball plunger having therein a ball provided so as not to be released to the outside and an elastic body for transmitting an elastic force to the ball; A head portion formed so that a mounting hole through which the ball plunger is coupled is vertically penetrated; And a screw portion rotatably coupled to a lower portion of the head portion and having a plurality of receiving grooves which are in contact with a lower portion of the ball plunger to form a ring shape, the ball plunger contacting the receiving groove according to a depth at which the ball plunger is coupled to the head portion, So that the torque can be adjusted.

Description

Torque control bolt {TORQUE CONTROL BOLT}

The present invention relates to a torque control bolt, and more particularly, to a bolt that can prevent a bolt from being loosened or broken by adjusting a torque of a bolt coupled to an object.

Generally, a bolt is a typical mechanical element used to fasten two different members or machine parts by turning them into a nut or a screw hole.

Such a bolt is generally composed of a polygonal head portion so as to apply torque by a tool such as a spanner or a socket wrench, and a thread portion formed integrally with the lower portion of the head portion and threadedly engaged with the nut or screw hole.

The bolts must be tightened with the specified torque required by the respective machine parts when they are connected to the nuts or screw holes. The specified torque is different for each part from one part to the next. When the operator wants to tighten the bolt properly, And work with a torque wrench as required by the instructions.

However, it is very troublesome for a worker to tighten a bolt to a specified torque by using a torque wrench while watching an operation manual at a workplace, so that the bolt has been fastened in a normal case depending on the operator's senses.

As a result of the practice of depending on this sensation, there is a problem that the bolt is tightened too much in some places and the joint part of the mechanical part is deformed, and in some places, the bolt is tightened too weakly There is a problem that the mechanical parts are disassembled in a short time.

In addition, Japanese Laid-Open Patent Application No. 10-2009-0032364 discloses a bolt-type bolt which is a bolt-type bolt that is fixed to a bolt body, &Quot;

However, in Japanese Patent Application Laid-Open No. 10-2009-0032364, there is a problem that when the over torque is applied, the bolt is broken and can not be used again.

A torque control bolt according to the present invention aims to solve the following problems.

First, to prevent breakage of bolt or parts by over torque tightening and to prevent loosening of bolt by under torque tightening.

Second, we want to adjust the torque required for bolt tightening.

Third, the bolts can be tightened with a predetermined torque so that they can be reused.

The problems to be solved by the present invention are not limited to those mentioned above, and other solutions not mentioned can be clearly understood by those skilled in the art from the following description.

The torque control bolt according to the present invention preferably includes a ball provided at one side so as not to be released to the outside, and a ball plunger having therein an elastic body for transmitting an elastic force to the ball.

Preferably, the torque control bolt according to the present invention includes a head portion formed such that a mounting hole through which the ball plunger is engaged is vertically penetrated.

The torque control bolt according to the present invention preferably includes a thread portion that is rotatably coupled to a lower portion of the head portion and has a plurality of receiving grooves that are in contact with a lower portion of the ball plunger to form a ring shape.

The torque control bolt according to the present invention is preferably capable of adjusting the torque by changing the elastic force of the ball plunger contacting the receiving groove according to the depth at which the ball plunger is coupled to the head portion.

In the torque control bolt according to the present invention, the head portion is formed with a ring-shaped coupling groove in the lower portion and a plurality of insertion grooves connected to the coupling groove on the side, and the screw portion has a ring- Shaped guide rails are formed along the side surfaces of the guide rails and one side of the engagement pins inserted into the insertion grooves moves along the guide rails.

In the torque control bolt according to the present invention, it is preferable that the engaging pin is screwed into the engaging groove.

In the torque control bolt according to the present invention, it is preferable that the ball plunger is screwed to the mounting hole.

In the torque control bolt according to the present invention, it is preferable that a tool engagement groove is formed on the head portion so that the head portion can be tightened and released by using a tool.

The torque control bolt according to the present invention can expect the following effects.

First, it is possible to prevent breakage of a bolt or a part by over torque tightening, and to prevent loosening of the bolt by tightening the under torque.

Second, the required torque can be adjusted according to the parts to be bolted.

Third, it is economical because the bolt can be tightened to a fastened part with a predetermined torque and reused.

The effects of the present invention are not limited to those mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the following description.

1 is a perspective view of a torque control bolt according to an embodiment of the present invention.
2 is a perspective view of a ball plunger separated from the torque control bolt of FIG.
3 is a perspective view of the torque control bolt head of FIG.
4 is an exploded perspective view of Fig.
FIG. 5 is a perspective view illustrating a coupling pin separated from the torque control bolt head of FIG. 1. FIG.
6 to 8 are sectional views of a torque control bolt according to an embodiment.

Hereinafter, a torque control bolt according to a preferred embodiment of the present invention will be described in detail with reference to FIGS. 1 to 8. FIG.

Referring to FIG. 1, a torque control bolt according to a preferred embodiment of the present invention includes:

A ball plunger (10) having therein a ball (14) provided so as not to be released to the outside and an elastic body for transmitting an elastic force to the ball (14);

A head portion 20 having a mounting hole 22 to which the ball plunger 10 is coupled so as to be vertically penetrated; And

And a screw portion 30 rotatably coupled to a lower portion of the head portion 20 and having a plurality of receiving grooves 32 in contact with a lower portion of the ball plunger 10 to form a ring,

The elastic force of the ball plunger 10 in contact with the receiving groove 32 is changed according to the depth of the ball plunger 10 coupled to the head portion 20 so that the torque can be adjusted.

2, the ball plunger 10 includes a hollow cylindrical housing 12, a ball 14 provided so as not to be detached from the one opened side of the housing 12, And an elastic body (not shown) provided on the ball 14 to transmit an elastic force to the ball 14. The outer side of the housing 12 is formed with a thread and the other side is closed to form a groove for using a tool such as a driver .

3 to 8, the head portion 20 is a portion for rotating the threaded portion 30 coupled to the lower portion, and has a ring-shaped coupling groove 26 at the lower portion thereof, A plurality of insertion grooves 28 to be connected are formed on the side surface, and the ball plunger 10 is coupled to at least one mounting hole 22 formed so as to penetrate up and down.

6 to 7, the threaded portion 30 has a ring-shaped protrusion 34 inserted into an engaging groove 26 formed in the head portion 20 at an upper portion thereof and a ring-shaped protrusion 34 formed along the side surface of the protrusion 34 And the lower ball 14 of the ball plunger 10 coupled to the mounting hole 22 formed in the head portion 20 is provided with a guide rail 36 of the head portion 20, A plurality of receiving grooves 32 are formed in a ring shape.

The receiving groove 32 is preferably hemispherical so as to be in contact with the bottom of the spherical ball 14, and the plurality of receiving grooves 32 may be continuous or spaced from each other to form a ring.

Since one side of the plurality of engaging pins 40 inserted into the insertion groove 28 is moved along the guide rail 36 when the head part 20 is rotated, the head part 20 and the screw part 30 are moved up and down And it is also possible to rotate each other.

5, the coupling pin 40 is a portion for rotating the head portion 20 and the screw portion 30 without being separated from each other. The coupling pin 40 is coupled to the coupling groove 26 in a screw- .

The ball plunger 10 is screwed into the mounting hole 22 of the head portion 20 so that the depth of the ball plunger 10 coupled to the head portion 20 can be adjusted, The elastic force of the inner elastic body of the ball plunger 10 that transmits the elastic force to the ball 14 of the ball plunger 10 in contact with the receiving groove 32 of the threaded portion 30 is changed according to the degree of protrusion of the ball plunger 10 Adjustment becomes possible.

That is, the pressure applied to the receiving groove 32 of the screw portion 30 by the ball 14 of the ball plunger 10 changes depending on the depth of the ball plunger 10 coupled to the head portion 20, Thus, when the head 20 is rotated, the ball 14 is disengaged from the receiving groove 32, so that the head 20 and the screw 30 can not rotate together.

When the allowable torque required for rotation is adjusted by using the ball plunger 10, if the torque higher than the allowable torque is applied, the threaded portion 30 does not rotate any more and only the head portion 20 rotates. Therefore, It is possible to prevent breakage of the object to which the control bolt is coupled.

The head portion 20 may be formed in a polygonal shape on its outer surface so as to be tightened and loosened by a tool such as a wrench or a screwdriver or a tool engagement groove 24 having a shape of a straight line, It is possible.

It is to be understood that the present invention is not limited to the above-described embodiments, but may be modified in various other forms without departing from the spirit of the present invention as claimed in the following claims It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

10: Ball plunger
12: Housing
14: ball
20: head portion
22: Mounting hole
24: Tool fastening groove
26: Coupling groove
28: Insertion groove
30:
32: Receiving groove
34:
36: Guide rail
40:

Claims

A ball plunger having therein a ball provided at one side so as not to be released to the outside and an elastic body for transmitting an elastic force to the ball;
A head unit having a mounting hole through which the ball plunger is coupled, And
And a screw portion rotatably coupled to a lower portion of the head portion and having a plurality of receiving grooves in contact with a lower portion of the ball plunger to form a ring shape,
The elastic force of the ball plunger contacting the receiving groove changes according to a depth of the ball plunger coupled to the head portion,
When the head portion is rotated with an allowable torque or more, the ball is disengaged from the receiving groove to prevent the thread portion from rotating,
Wherein the head portion has a ring-shaped coupling groove at the bottom and a plurality of insertion grooves connected to the coupling groove at a side surface thereof,
The screw portion has a ring-shaped protrusion which is inserted into the coupling groove at an upper portion thereof and a ring-shaped guide rail along a side surface of the protrusion,
Wherein the engaging pin inserted into the insertion groove is screwed into the engaging groove and one side of the engaging pin is moved along the guide rail to prevent the head and the screw portion from being separated vertically,
Wherein the head portion has a hexagonal outer surface so that the head portion can be tightened and loosened by using a tool, and a cross-shaped tool engagement groove is formed in an upper portion of the head portion.

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The method according to claim 1,
And the ball plunger is screwed into the mounting hole.

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