JP2532529Y2 - Union joint structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a union joint structure for connecting a pipe for piping to a union screw connected to various piping parts by using a union nut.

[0002]

2. Description of the Related Art FIG. 7 is a view for explaining a conventional example of this type of union joint structure. Reference numeral 1 denotes a pipe, a straight portion 2 having a bulge portion 2a formed at a tip end, and a base of the straight portion 2. The end portion has a continuous curved portion 3. A hexagonal union nut 5 is externally inserted into the straight portion 2 of the pipe 1. The union nut 5 is screwed to a male screw formed at one end of a union screw (not shown), and the bulge portion 2 a is formed of a union screw. Adhere to one end. The other end of the union screw is connected to a piping component (not shown), and the pipe is connected to the piping component (not shown) by fastening the union nut 5 to the union screw.

[0003]

However, such a conventional union joint structure has the following problems. (A) If the straight portion 2 of the pipe 1 is short, the moving amount of the union nut 5 toward the curved portion 3 is small, so that the bulge portion 2a cannot be projected from the union nut 5, and the bulge portion 2a cannot be visually recognized. (B) If the straight portion 2 is short, the bulge portion 2a cannot be post-processed after the union nut 5 is extrapolated to the straight portion 2 for the same reason as (a). (C) If the total length of the union nut 5 is shortened to avoid the problems (a) and (b), when there is no limited working space (particularly space in the union nut moving direction), the allowance for gripping the spanner is required. May not be able to be removed. (D) When the spanner working space is narrow and the angle at which the spanner can be turned is about 60 degrees and the spanner must be operated without being able to see the union nut, the spanner engaging surface of the union nut must be The wrench can be engaged with the union nut simply by inserting the wrench from a certain direction.However, conventionally, there is no standard for setting the wrench engagement surface in a predetermined direction, and the orientation of the wrench engagement surface is defined. It was difficult to do.

An object of the present invention is to provide a union joint structure in which the amount of movement of the union nut in the axial direction is increased and the direction of the wrench engaging surface of the union nut is easily defined.

[0005]

The present invention will be described with reference to FIG. 1 showing an embodiment. The present invention is based on a union screw 11 having a male screw 11b formed at one end and a pipe member 12 connected at the other end. A pipe 13 having a straight portion 14 provided with a bulge portion 14a at a distal end, a curved portion 15 continuing to a base end of the straight portion 14, and a straight portion 1 of the pipe 13;
4 and the union screw 11 in order to bring the bulge portion 14a into close contact with one end of the union screw 11.
And a union joint structure having a union nut 20 screwed into the male screw 11b. And the said objective is achieved by providing the cut 20a of width and length into which the pipe bending part 15 enters at least one surface of the union nut 20.

[0006]

When the union nut 20 is moved toward the pipe bending portion 15 along the axial direction with the cut 20a of the union nut 20 oriented in the bending direction of the pipe bending portion 15, the bending portion 15 enters the cut 20a. Thus, the bulge portion 14a of the straight portion 14 projects from the union nut 20. Therefore, the assembling work can be performed while visually recognizing the bulge portion 14 a of the pipe 13, and after the union nut 20 is extrapolated to the straight portion 14, the bulge portion 14 a
Can be processed. In addition, union nut 2
The wrench engagement surface of the union nut 20 can be easily defined in a predetermined direction with reference to the position of the notch 20a of 0, so that the spanner rotation angle is limited to approximately 60 degrees, and the union nut can be visually operated. Even in the case where it is necessary to insert the wrench from a fixed angle, the wrench can be securely engaged with the union nut 20 to fasten the union nut.

In the section of the means for solving the above-mentioned problem and the operation which explain the configuration of the present invention, the drawings of the embodiments are used to make the present invention easy to understand. However, the present invention is not limited to this.

[0008]

1 to 5 show an embodiment of the present invention. In FIG. 1, reference numeral 11 denotes a union screw having an oil passage 11a in the axial direction, and male screws 11b, 1
1c is formed, and one male screw 11c is screwed to the piping component 12. Reference numeral 13 denotes a pipe, a first straight portion 4 having a bulge portion 14a formed at a distal end portion, a curved portion 15 continuing to a base end portion of the first straight portion 14, and a curved portion 15
And a second straight portion 16 continuous with the first straight portion. Bulge part 14
The first straight portion 14 at the end from a is inserted into the oil passage 11 a of the union screw 11 and fastened to the union screw 11 by the union nut 20, and the second straight portion 16 is connected to the hydraulic device 17.

Reference numeral 20 denotes a union nut which is slidably inserted outside the first straight portion 14. One end of the union nut is shown in FIG.
As shown in FIGS. 3 and 4, the union nut 20 is
A pair of cuts 20a that can be moved in the axial direction up to
Are formed. The cut 20 a may be formed on at least one surface of the union nut 20. An inwardly projecting flange 20b that can be locked to the bulge portion 14a is formed at the center of the union nut 20, and the other end of the union nut 20 is a male screw portion 11b of the union screw 11.
Screwed. The first straight portion 14 between the bulge portion 14a and the male screw portion 11b of the union screw 11 has an O-ring 1
When the union nut 20 is fastened to the union screw 11, the space between the bulge portion 14 a and the tip of the male screw portion 11 b is sealed by the O-ring 17.

In the joint structure as described above, when the union nut 20 is moved toward the bending portion 15 in the axial direction, the bending portion 15 can enter the cut 20a. In addition, the union nut 20 can be moved to the bending portion 15, and the bulge portion 14a can be sufficiently protruded from the union nut 20. As a result, the assembling operation can be performed while visually recognizing the bulge portion 14a. Further, since the first straight portion 14 of the pipe 13 can be projected from the union nut 20, the bulge portion 14a can be post-processed after the union nut 20 is extrapolated to the first straight portion 14. .

Further, the notch 2 of the union nut 20
0a is a reference for setting the spanner engagement surface of the union nut 20 in a predetermined direction. That is, as shown in FIG. 5, the working space of the spanner is narrow, the angle θ at which the spanner can be rotated is limited to approximately 60 degrees, and the union nut 20 is rotated.
If you have to work without being able to see the
The spanner engagement surface of the union nut 20 can be defined in a predetermined direction with reference to a. Therefore, as shown in FIG. 5, even when the rotation of the wrench is restricted by the obstacle 25 and the union nut 20 cannot be seen, the union nut 20 is inserted into the spanner SP inserted in the direction shown by the solid line in FIG. So that the spanner engagement surface can engage
If the direction of the wrench engaging surface of the union nut 20 is defined with reference to the cut 20a, the union nut 20 can be engaged with the union nut 20 simply by inserting the wrench SP from the direction shown by the solid line in FIG. Can be concluded.

Further, in the case shown in FIG. 6, if the union nut 20 is simply shortened, the vehicle body panel 31 hinders the spanner SP from being applied to the union nut 20. By providing the notch 20a into which the curved portion 15 enters without shortening the overall length of the wrench SP, it is possible to secure a gripping margin of the spanner SP as shown in FIG. In FIG. 6, 32
Is a radiator, 33 is an oil cooler for an automatic transmission, 3
4 is a stabilizer, and the spanner SP is a stabilizer 3
It can be engaged with the union nut 20 only from the gap between 4 and the front end of the vehicle body panel 31.

[0013]

[Effects of the Invention] According to the present invention, a cut is formed in the union nut to allow the curved portion of the pipe to enter, and the bulge and the straight portion of the pipe can be protruded from the union nut. It is also possible to post-process the bulge portion after extrapolating the union nut to the straight portion. In addition, the wrench engagement surface of the union nut can be easily defined in a predetermined direction based on the position of the cut of the union nut, so that the wrench rotation angle is limited to approximately 60 degrees, and the union nut cannot be seen. When work must be performed, the wrench can be securely engaged with the union nut and the union nut can be fastened simply by inserting the wrench from a certain angle.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional front view showing an embodiment of a union joint structure according to the present invention.

FIG. 2 is a view showing a union nut and a pipe used in FIG. 1, and is a partially sectional front view showing a state in which a pipe bending portion is inserted into a cut of the union nut.

FIG. 3 is a perspective view showing a union nut and a pipe used in FIG. 1 and showing a state in which a pipe bending portion enters a cut of the union nut as viewed from a bulge portion side.

FIG. 4 is a perspective view of the same state as FIG. 3 as viewed from a cutting side.

FIG. 5 is an operation explanatory view of one embodiment of the union joint structure according to the present invention.

FIG. 6 is a diagram illustrating the operation and effect of the embodiment of the union joint structure according to the present invention.

FIG. 7 is a front view showing a conventional union joint structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Union screw 11b Male screw 12 Piping equipment 13 Pipe 14 1st straight part 14a Bulge part 15 Curved part 20 Union nut 20a Notch

Claims (1)

(57) [Scope of request for utility model registration] 1. A union screw having one end formed with a male screw and the other end connected to a piping component, a straight portion having a bulge portion provided at a distal end portion, and a curved portion connected to a base end portion of the straight portion. A union joint structure comprising: a pipe; and a union nut which is externally inserted into a straight portion of the pipe and is screwed to a male screw of the union screw to bring the bulge portion into close contact with one end of the union screw. A union joint structure characterized in that at least one surface of a union nut is provided with a cut having a width and a length into which a curved portion of the pipe enters.