JPH05126286A - Metal fitting for hose - Google Patents

Abstract

PURPOSE:To easily form a coating layer on an insert by providing the cylindrical insert to be fitted to an outer periphery of an end of a pipe, and a sleeve which caulks and fixes a hose fitted to the outer periphery of the insert. CONSTITUTION:A fitting for hose applied to, for instance, a cooler hose of rifregerator for a vehicle is composed of a pipe 2 to be connected to a discharge or an inflow port of a functional part, a cylindrical insert 3 independent on the pipe 2 and to be fitted to an outer periphery of the end of the pipe 2, and a sleeve 5 provided on the outer side of the pipe 2 and used for caulking and fitting a hose 4. A coating layer 6 is formed on a full surface of the insert 3 in order to improve seal life between the insert 3 and the hose 4. A fitting hole 5a of the sleeve 5 is fitted to an outer peripheral groove of the pipe 2, afterward the pipe 2 is widened for fixing the sleeve 5. The hose 4 is fixed to hose metal fittings 1 by caulking the sleeve 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hose fitting for hermetically connecting a pipe and a hose.

[0002]

2. Description of the Related Art Conventionally, there is a hose fitting for connecting a cooler hose used in a vehicle refrigeration system.
This metal fitting for hose consists of an insert pipe and a cylindrical sleeve provided outside the insert pipe. The hose inserted between the insert pipe and the sleeve is fixed by caulking the sleeve. Is. A coating layer is formed on the outer peripheral surface of the insert pipe to which the hose is fitted in order to enhance the sealing property between the insert pipe and the hose.

[0003]

However, in the vehicle refrigeration system, since the cooler hose is mounted in the engine room, the shape of the cooler hose varies depending on the vehicle type. Further, since it is necessary to prevent the coating liquid from adhering to the inside of the cooler hose, a large number of man-hours are required to apply the coating liquid. The present invention has been made based on the above circumstances, and an object thereof is to provide a hose having a long life at a low cost.

[0004]

In order to achieve the above object, the present invention has a pipe through which a fluid passes and an annular projection on the outer periphery, and is fitted in an airtight manner on the outer periphery of the tip of the pipe. A combined insert and a sleeve provided outside the pipe for caulking and fixing a hose fitted to the outer periphery of the insert, wherein the insert is provided separately from the pipe, and the hose is fitted to the insert. A technical means is that a coating layer is formed on the outer peripheral surfaces to be joined together and mechanically coupled to the pipe.

[0005]

In the hose fitting of the present invention having the above structure, the insert provided separately from the pipe is airtightly fitted to the outer periphery of the pipe, and the coating layer is formed on the outer peripheral surface of the insert. Then, the connected hose is fitted to the outer periphery of the insert having the coating layer formed thereon and fixed by caulking the sleeve.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the hose fitting of the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view of a hose fitting showing a state in which the hose is fixed. This hose fitting 1 is used for a cooler hose of a vehicle refrigeration system, and is a pipe 2 connected to a discharge port or an inflow port (not shown) of each functional component constituting the refrigeration cycle.
And a tubular insert 3 fixed to the outer periphery of the tip of the pipe 2, and a sleeve 5 for caulking and fixing a hose 4 fitted to the outer periphery of the insert 3.

The pipe 2 is made by cutting a cylindrical member such as aluminum or iron into a predetermined size. The insert 3 is manufactured separately from the pipe 2 by cutting or forging, and has three annular projections 3a on its outer periphery. The protrusion 3a is provided to prevent the hose 4 fitted to the outer periphery of the insert 3 from coming off and to ensure the sealing performance with the hose 4, and has a mountain shape, a mountain pitch of 5 mm, and a mountain height of 5 mm. It is formed with a specification of 1 mm. In addition, on all surfaces of the insert 3, the insert 3
A coating layer 6 is formed to increase the life of the seal between the hose 4 and the hose 4 (see FIG. 2). The coating layer 6 is formed by applying a coating agent such as synthetic resin-based paint or rubber-based paint, which is less deteriorated even under high temperature conditions, to the entire surface of the insert 3 and then performing heat treatment.

The thickness of the coating layer 6 is 5 μ-100
About μ is preferable, and when the thickness of the coating layer 6 is 5 μ or less, the sealing property deteriorates, and when it is 100 μ or more, the workability at the time of inserting the hose 4 decreases. Synthetic resin-based paints applied as coating agents include phenol resin paints, urea resin paints, melanin resin paints, phthalic acid resin paints, and the like, and rubber-based paints include fluororubber paints, chlorinated rubber paints, and cyclized rubber paints. , Synthetic rubber paint, etc.

The sleeve 5 is made from a cylindrical member such as aluminum or iron by pressing, and a fitting hole 5a for fitting the pipe 2 is formed in the center of the end surface. The sleeve 5 is fixed by fitting the fitting hole 5a into the outer peripheral groove of the pipe 2 and then expanding the pipe 2. After the sleeve 5 is fixed to the pipe 2, the insert 3 is fitted to the outer periphery of the tip end of the pipe 2 to expand the inside of the pipe 2 as shown in FIG. It Further, the tip end portion (right end portion in FIG. 1) of the pipe 2 is expanded larger than the others (see FIG. 3) to be fixed to the outer periphery of the tip end portion of the pipe 2. The hose 4 is a rubber tube having a reinforcing braid layer formed therein, and is fitted to the outer periphery of the insert 3 and then fixed to the hose fitting 1 by caulking a sleeve 5 as shown in FIG. .. In the hose fitting 1 of this embodiment, the insert 3 is manufactured separately from the pipe 2, and the insert 3 is mechanically fixed to the tip of the pipe 2. Therefore, the shape of the insert 3 can be made common regardless of the shape of the cooler hose. Therefore, the process of forming the coating layer 6 on the insert 3 can be easily automated, and the labor for masking or the like is not required, so that the cost for forming the coating layer 6 can be significantly reduced. Become.

Next, a second embodiment of the present invention will be described with reference to FIGS. 4 and 5. FIG. 4 is a sectional view of the hose fitting 1 showing a state in which the hose 4 is fixed, and FIG. 5 is a sectional view of the hose fitting 1. The hose fitting 1 of this embodiment is made by integrally manufacturing the insert 3 and the sleeve 5 shown in the first embodiment. The sleeve 5 and the insert 3 are manufactured by first forming a mountain-shaped protrusion 3a by rolling, forming it into a U-shape by pressing, and then forming a coating layer 6 on the surface of the protrusion 3a. There is. Then, after inserting the pipe 2 into the inner circumference of the insert 3, the inner surface of the pipe 2 is expanded to bring the insert 3 and the pipe 2 into close contact with each other, and the tip end of the pipe 2 is expanded larger than the other, so that the sleeve 5 And the insert 3 is fixed to the pipe 2.

The hose 4 is fixed to the hose fitting 1 by caulking the sleeve 5 after fitting the hose 4 onto the outer periphery of the insert 3. Similar to the insert 3, the sleeve 5 has a common shape regardless of the shape of the cooler hose. Therefore, even if the insert 3 and the sleeve 5 are integrally manufactured as shown in this embodiment, the same as in the first embodiment. The effect of can be obtained. Although the coating layer 6 is formed only on the surface of the protrusion 3a in this embodiment, the coating layer 6 is also formed on the inner peripheral surface of the insert 3 in order to improve the sealing property with the pipe 2. Is also good.

In the metal fitting for a hose of the present invention, the insert and the pipe are formed separately, so that the coating layer can be easily formed and the cost for forming the coating layer can be reduced. it can. As a result, it is possible to provide a long-life hose at low cost.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a hose fitting showing a state in which a hose is fixed.

FIG. 2 is an explanatory view of assembling a hose fitting.

FIG. 3 is a cross-sectional view of a hose fitting.

FIG. 4 shows a second embodiment of the present invention and is a cross-sectional view of a hose fitting showing a state in which the hose is fixed.

FIG. 5 is a sectional view of a hose fitting according to a second embodiment.

[Explanation of symbols]

 1 Metal fittings for hose 2 Pipe 3 Insert 4 Hose 5 Sleeve 6 Coating layer

Claims (1)

[Claims] 1. An a) pipe through which a fluid passes, b) a tubular insert which is hermetically fitted to the outer periphery of the tip of the pipe, and c) an insert which is provided outside the pipe. And a sleeve for crimping and fixing a hose fitted to the outer periphery of the pipe, the insert is provided separately from the pipe, and a coating layer is formed on the outer peripheral surface to which the hose is fitted, and the pipe is mechanically attached. Metal fittings for hoses characterized by being connected to.