JPH04117281U - threaded fittings - Google Patents

Abstract

(57) [Summary] [Purpose] Even when the bracket mounting seat cannot be secured,
To provide a threaded joint that can prevent damage to a pipe due to external force without impairing workability. [Structure] A first cylindrical member 10 having a male thread 10a is fixed to the pipe 6, a male threaded portion 8b extending toward the first cylindrical member 10 side of the threaded member 8 is provided, and the male threaded portion 8b and the first cylindrical member are connected to each other. shaped member
A second cylindrical member 11 is provided which is screwed onto the male thread 10a of the cylindrical member 10a. Since the first cylindrical member 10 supports the central portion of the pipe 6, the stress generated in the pipe 6 itself is reduced even when an external force such as vibration is applied. Even if a bracket attachment part for supporting the pipe 6 cannot be secured in the middle, it is possible to prevent the pipe 6 from being repeatedly fatigued due to external forces such as vibrations, and to prevent damage to the pipe 6 caused by repeated fatigue. This means that liquid leakage due to damage to the pipe 6 can be prevented.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to threaded joints used in automobile brake systems, etc. Ru.

0002

[Conventional technology]

Figure 5 shows an example of a threaded joint conventionally used in automobile brake systems. There is something. In the figure, 1 is a pipe having a flared portion 1a, and 2 is this pipe. 1 is a member to be attached to which it is connected; 3 is a bolt-shaped member that has a through hole 3a into which the pipe 1 is inserted; This is a screw member. The mounted member 2 has a screw hole 2a with a diameter slightly larger than the flare part 1a. is formed, and a convex portion 2b is formed at the bottom thereof. Furthermore, in the attached member 2, A hole 2c communicating with the hole 1b of the pipe 1 is provided to open in the convex portion 2b. And then, With the same member 3 fitted into the pipe 1, screw it into the screw hole 2a and align the flared part 1a with the convex part 2b side. The pipe 1 is connected to the member to be attached 2 by pressing the pipe 1 to the member 2 to be attached.

0003

[Problem that the idea aims to solve]

Incidentally, as shown in Fig. 5, external force may act on the pipe 1, but If an external force is repeatedly applied to pipe 1 in this way, this pipe will become damaged due to repeated fatigue. There is a risk that the pipe 1 may be damaged, and furthermore, this damage to the pipe 1 may cause liquid leakage. Na In order to solve this problem, as shown in FIG. It is considered that a bracket 5 is provided and the pipe 1 is supported by this bracket 5. It will be done. However, in this case, new work is required to install the bracket 5. As a result, work efficiency deteriorates.

0004 The present invention was developed in view of the above problems, and is designed to support the middle part of the pipe. Even if it is not possible to secure a mounting seat for the bracket, it is possible to prevent damage to the pipe due to external force. The purpose of the present invention is to provide a threaded joint that can prevent such problems without impairing business performance.

[0005]

[Means to solve the problem]

The present invention uses a pipe with a flared part as a means to solve the above problems. A bolt-like screw member having a through hole for insertion is provided, and the screw member is inserted into the pipe. The pipe is inserted into the screw hole formed in the member to be attached to the pipe. In this state, the pipe is screwed together and the flare part is pressed against the attached member. In the threaded joint connected to the attached member, the pipe has a male thread. A first cylindrical member is fixed immovably in the axial direction, and the first cylindrical member is fixed to the screw member. A male threaded portion extending toward the material side is provided, and a second cylindrical member is provided on the male threaded portion and the first cylindrical member. It is characterized by having shaped members screwed together.

[0006]

[Effect]

With such a configuration, the first cylindrical member connects the pipe via the second cylindrical member. The pipe can also be used in cases where the central portion is to be supported and external forces such as vibrations are applied. The stress generated within itself is reduced.

[0007]

【Example】

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. In the figure, 6 is a pipe having a flare part 6a which will be described later, and 7 is an attached part to which this pipe 6 is connected. The material 8 is a bolt-like threaded member with a through hole 8a into which the pipe 6 is inserted. The threaded member 8 is formed with a male threaded portion 8b, which will be described later. The attached member 7 includes A screw hole 7a with a diameter slightly larger than the flared portion 6a is formed, and a convex portion 7b is formed at the bottom of the screw hole 7a. has been done. Further, the mounted member 7 has a hole 7c communicating with the hole 6b of the pipe 6 and a convex portion 7b. It is open to the

[0008] A bulge portion 9 is provided in the middle of the pipe 6 so as to protrude toward the outer circumference. A first cylindrical member 10 having a male thread 10a is attached to this pipe 6 so as to reach the pipe 9. Press-fitted and fixed. Note that the fixing to the first cylindrical member 10 to the pipe 6 and the above-mentioned The flare portion 6a is formed as shown in FIGS. 2 to 4. That is, the end At the time of straight pipe formation (Fig. 2), the first cylindrical member 10 is press-fitted to the bulge portion 9 of the pipe 6. (FIG. 3), and then the end portions are expanded to form flared portions 6a.

[0009] The threaded member 8 is formed with the male threaded portion 8b extending toward the first cylindrical member 10. . A second cylindrical member 11 is screwed onto this male threaded portion 8b and the first cylindrical member 10. I'm being kicked.

0010 In the screw type joint configured in this way, the first cylindrical member 10 is connected to the second cylindrical member 11. The central part of the pipe 6 is supported through the pipe 6, which prevents external forces such as vibration from being applied. Even in such a case, the stress generated in the pipe 6 itself is reduced. This shows in Figure 6 The repeated fatigue caused by external forces such as vibration can be avoided without installing the bracket 5. It is possible to prevent damage to the pipe 6 and liquid leakage due to repeated fatigue. It becomes.

[0011] Moreover, by not providing the bracket 5 as shown in FIG. Even when used in the brake system of a car, the vibration of the pipe 6 is transmitted to the car body. This means that it can be suppressed.

0012

[Effect of the idea]

Since the present invention is a screw type joint configured as explained above, it is not subject to external forces such as vibrations. Even when the pipe is exposed to stress, the stress generated in the pipe itself is reduced. Even if it is not possible to secure a bracket mounting part to support the inside, the It is possible to prevent repeated fatigue of pipes caused by repeated fatigue. It is possible to prevent pipe damage caused by water leakage and liquid leakage due to pipe damage. Become.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a threaded joint according to an embodiment of the present invention.

FIG. 2 is a front view of the pipe used in the threaded joint, showing the state before the first cylindrical member is fixed.

FIG. 3 is a front view showing a state in which a first cylindrical member is fixed to a pipe used in the threaded joint.

FIG. 4 is a front view showing a state in which a flare portion is formed in the threaded joint to which the first cylindrical member is fixed.

FIG. 5 is a sectional view showing an example of a conventional threaded joint.

FIG. 6 is a perspective view showing a bracket used in a conventional threaded joint.

[Explanation of symbols]

6 pipe 6a Flare part 7 Attached member 8 Screw member 8a through hole 8b Male thread part 10 First cylindrical member 10a male thread 11 Second cylindrical member

Claims (1)

[Scope of utility model registration request] 1. A bolt-like threaded member having a through hole into which a pipe having a flared portion is inserted is provided, and the threaded member is inserted into a threaded hole formed in a member to be attached to the pipe. In the threaded joint, the pipe is connected to the attached member by screwing together with the pipe inserted and pressing the flare portion against the attached member, the pipe having a first cylindrical member having a male thread. fixed immovably in the axial direction, the screw member is provided with a male threaded portion extending toward the first cylindrical member, and a second cylindrical member is screwed into the male threaded portion and the first cylindrical member. A threaded joint that is characterized by