JPS61206892A - Joint fitting for hose - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a fitting for a hose, and more particularly to a fitting for a fitting for connecting a brake pipe and a brake hose of a hydraulic brake for an automobile.

(Prior Art) FIG. 2 shows a conventional joint fitting (Japanese Patent Publication No. 44-997), which is the basis of the present invention. A flare 12 is formed at the tip of a tube body 10 serving as a brake pipe. A flare nut 16 having a threaded portion 14 formed on the outer circumferential surface and slidable in the axial direction of the tube 10 is attached to the tube 10 .

Ru.

The joint fitting is composed of a main body 18 and an inner cylinder 20. A cylindrical threaded part 24 is formed at one end of the main body 18 and has a threaded part 22 formed on the inner peripheral surface to be threaded into the threaded part 14 of the flare nut 16, and the other end has a threaded part 24 that is visible as a brake hose. A thin-walled cylindrical portion 28 is formed into which one end of the hose 26 is inserted. Further, between the threaded part 24 of the main body 18 and the thin-walled cylindrical part 28, a nut part 30 that acts as a wrench hook or a rotation stopper is formed on the outer periphery. An intermediate portion 34 is provided with a through hole 32 that communicates with the inside of the cylindrical portion 28 . A metal sheet portion 35 that is pressed against the flare 12 is formed at the end of the inner cylinder 20 on the side of the threaded portion 24 . The inner cylinder 20 is press-fitted into the through hole 32 of the main body 18 so that the end on the side of the thin-walled cylinder part 28 protrudes near the open end of the thin-walled cylinder part 28, and is welded to the main body 18 by brazing or the like.

The above-mentioned joint fitting is made by inserting the inner cylinder 2o into the hole of the flexible hose 26 and inserting one end of the flexible hose 26 into the thin-walled cylinder part 28, and then inserting the thin-walled cylinder part 28 into the thin-walled cylinder part 28 as shown in FIG. It is attached to the flexible hose 26 by caulking. Then, by screwing the flare nut 16 into the threaded part 24 and tightening it, the flare 12 and the seat part 35 are brought into pressure contact.
Pipe body 10 and flexible hose 26 are connected.

(Problems to be Solved by the Invention) However, in such conventional joint fittings, since the main body and the inner cylinder are heated by brazing, etc., the main body and the inner cylinder are both made of metal, and the main body and the inner cylinder are made of metal. are integrated by welding, so if the axis of the threaded part of the main body and the center of the seat part do not match, the seat part will not deform when tightened, resulting in a gap between the flare and the seat part. This may cause oil leakage. Therefore, precision machining of the main body and the cylinder and precision assembly of the main body and the inner cylinder are required, which increases the number of man-hours and increases the cost. In addition, in order to prevent the flare nut from loosening, the flare nut must be tightened to the threaded portion of the main body with great force, resulting in a problem that the workability of attachment and detachment deteriorates.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a hose fitting that can be manufactured at low cost and has good workability for attachment and detachment.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a main body including a cylindrical portion into which one end of a flexible hose is inserted and a threaded portion into which a flare nut is screwed; An inner tube extends in the axial direction of the tube through the main body so as to be inserted into the hole of the hose, and an inner tube is attached to the outer periphery of the threaded end of the inner tube so that the flare formed on the tube comes into pressure contact with the inner tube. and a seat portion made of an elastic body.

(Function) The joint fitting according to the present invention can be attached to a flexible hose by inserting the inner cylinder into the hole of the flexible hose, inserting the flexible hose into the cylindrical part, and caulking the cylindrical part. . Further, by screwing the flare nut into the threaded portion, the flare and the seat portion are brought into pressure contact, and the tube/body and the flexible hose are connected. When connecting the tubular body and the flexible hose, since the seat portion is made of an elastic body, the tightening force compresses and deforms the seat portion, so that the flare and the seat portion are firmly attached.

(Effects of the Invention) As explained above, according to the present invention, even if the seat part is eccentric with respect to the flare, the seat part is compressively deformed and tightly attached to the flare during connection, so processing errors can be tolerated to some extent. In addition to being able to manufacture at low cost, the restoring force of the seat allows the seat and flare to be brought into close contact with each other, so the tightening force can be reduced compared to conventional methods, improving workability when attaching and detaching. can get.

〔Example〕

An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 shows an embodiment in which the present invention is applied to a flare type female pipe joint.

The joint fitting according to this embodiment is composed of a main body 18 and an inner cylinder 20. One end of the main body 18 is formed with a threaded part 24 having a threaded part 22 formed on the inner peripheral surface to be threaded into the threaded part of the flare nut, and one end of a flexible hose is inserted into the other end. A thin cylindrical portion 28 is formed. Further, between the threaded part 24 of the main body 18 and the thin-walled cylindrical part 28, there is a nut part 30 on the outer periphery that acts as a wrench hook or a rotation stopper.
An intermediate portion 34 is provided which includes a partition wall 38 having a through hole 32 that communicates the inside of the threaded portion 24 and the inside of the thin-walled cylindrical portion 28 .

The inner cylinder 20 is composed of a metal tube having a length Q, with one end protruding into the threaded part 24 and the other end extending to the open end of the thin-walled cylinder part 28. As shown in FIG. 3, an inner cylinder support member 40 made of synthetic resin is covered. The inner cylinder support member 40 has a thickness that is approximately the same as that of the partition wall 38.
It is composed of a cylindrical press-fitting part 42 having a length of , and an outer diameter slightly larger than the inner diameter of the through hole 32, and a substantially truncated conical seat part 36 that is pressed into contact with a flare formed in the tube body. There is.

In order to cover the outer circumference of the inner cylinder 20 with the inner cylinder support member 4o4, the inner cylinder support member 40 is molded using an injection molding machine.
The inner cylinder 20 may be press-fitted into the hole 44 of 0, or the inner cylinder support member 40 and the inner cylinder 20 may be integrally molded by a nesting method during injection molding.

The inner cylinder 20 covered with the inner cylinder support member 40 as described above is inserted into the through hole 32 of the intermediate part 34 from the threaded part 24 side, and the press-fitting part 42 is press-fitted into the through-hole 32 and assembled into the main body 18. Can be attached. At this time, the press-fitting part 42 is compressed by the partition wall 38, and the restoring force of the synthetic resin press-fitting part 42 causes the partition wall 3
8 and the press-fitting part 42 and the press-fitting part 42 and the outer periphery of the inner cylinder 20 are in close contact with each other, thereby preventing oil leakage.

In the joint fitting assembled in this way, the thin-walled cylindrical portion 28 is caulked and attached to one end of the flexible hose, and the flare and the seat portion 36 are connected by screwing and tightening the flare ring. are pressed together to connect the tube body and the flexible hose. At the time of this connection, the synthetic resin sheet portion is compressed and deformed by the flare, so that the inner cylinder and the inner cylinder supporting member are brought into even stronger contact with each other. Furthermore, even if the seat portion is eccentric with respect to the flare, the seat portion is compressively deformed toward the center of the flare and is brought into close contact with the flare. Furthermore, since the inner cylinder is supported by the bulkhead of the main body via a press-fitted part made of synthetic resin, if the flexible hose moves in a direction perpendicular to the longitudinal direction after connection, it will resist the restoring force of the synthetic resin. Since the inner cylinder moves together with the flexible hose and the flexible hose is not bent at the end of the inner cylinder, the life of the flexible hose can be extended. In addition, in the past, the metal material was annealed and softened due to heating during brazing, and the inner tube was crushed during caulking, so it was necessary to use a material with high tensile strength, but in this example, brazing Since the fittings are assembled only by press-fitting, low-strength and inexpensive materials can be used.

In addition, although the example in which the present invention is applied to a flare type female pipe joint has been described above, the present invention can also be applied to a flare type male pipe joint.

Furthermore, although an example in which the seat portion is made of synthetic resin has been described, it may also be made of an elastic body such as oil-resistant rubber. Further, after the inner cylinder is welded to the main body, a sheet portion made of an elastic body may be applied to cover the outer periphery of the end of the inner cylinder on the threaded portion side.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view showing one embodiment of the present invention, FIG. 2 is an explanatory view showing a conventional joint, and FIG. 3 is a partial sectional view showing the inner cylinder and internal information support member of the above embodiment. . 18...Main body, 20...Inner cylinder, 22...
- Threaded part, 28...Cylinder part, 36... Seat part.

Claims (1)

[Claims] A main body including a cylindrical part into which one end of the flexible hose is inserted and a threaded part into which a flare nut is screwed; A hose comprising an inner cylinder extending in the axial direction, and a seat made of an elastic body formed on the outer periphery of the threaded part side end of the inner cylinder so that a flare formed on the pipe body is pressed against the inner cylinder. Fittings.