JPH0371596B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a hose cap fitting.

[Prior Art] Generally, a hose cap fitting has a hose fastening portion on one end side into which a hose terminal can be inserted and crimped, and a connector portion on the other end side for connecting to another member.

Here, the hose fastening part is often made up of a nipple part and a socket part.
This hose fastening section, which is composed of a nipple section and a socket section, is designed such that the hose end to be connected is inserted between the nipple section and the socket section, and then the socket section is crimped from the outside to fasten the hose end.

On the other hand, the connector portion of the hose fitting includes a screw type connector portion and a seal type connector portion.

The screw-type connector portion has a female screw or a male screw, and is designed to screw together the connecting portion of another member connected to the female screw or male screw.

On the other hand, a hose fitting having a seal type connector part has a socket part 2 and a nipple part 3 on one end side of the fitting main body 1, as shown in FIG.
There is a hose fastening section consisting of a hose fastening section, and a connector section 4 is provided on the other end side of the metal fitting main body section 1.

The connector portion 4 has a bolt connection hole 5 opening therethrough perpendicularly to the axial direction of the hose cap fitting, and is also provided with a side hole 6 serving as a fluid path. Although not shown in the drawings, another member, such as a connecting bolt provided with a fluid path, is inserted into this bolt connecting hole 5 through a soft metal washer, and then tightened with a nut through the soft metal washer. There is.

Therefore, in a hose fitting having a seal type connector part 3, it is essential that the sealing surfaces on both sides of the bolt connection hole 5 of the connector part 4 be smooth and intact in order to prevent fluid leakage.

Now, in a conventional hose fitting having a seal type connector part 4, the connector part 4 is manufactured from soft carbon steel in consideration of machinability and weldability. Therefore, there was a problem that the sealing surfaces on both sides of the bolt connection hole 5 of the connector part 4 were susceptible to damage. That is, since the sealing surfaces on both sides of the bolt connection hole 5 of the connector part 4 are made of soft carbon steel and are exposed to the outside world, it is difficult to weld the nipple or socket part to the fitting body, or to seal the sealing surfaces. They were susceptible to injury due to contact with other parts during the surface plating process, final inspection process, etc. In the process of welding the nipple and socket parts to the upper fitting body, there was a problem in that the soft carbon steel further softened at the welding temperature.

The damaged sealing surface deteriorates in its sealing performance with the soft metal washer, and when assembled into a high-pressure hose, causes leakage of fluid moving within the hose.

Here, the connector part 4 of the hose fitting having a seal type connector part is made of an ultra-hard material.
For example, it is possible to use ultra-hard metals or ceramic materials, but they have poor machinability and weldability.
A practical hose cap fitting for a high-pressure hose could not be obtained.

[Problems to be Solved by the Invention] The present invention has been made based on the above points, and its purpose is to eliminate the drawbacks of the prior art described above and to provide excellent mechanical properties and sealing properties. An object of the present invention is to provide a hose fitting having a seal type connector part that exhibits excellent performance.

[Means for Solving the Problems] The gist of the present invention is that there is a hose fastening portion consisting of a nipple portion and a socket portion on one end side of the metal fitting body, and the other portion of the metal fitting body is In a hose cap fitting that has a connector part on the end side that can be connected to other parts through a bolt connection hole, the connector part is made of a hard ceramic material, and the hard ceramic connector part is strongly fixed to the main body of the fitting. It consists of

That is, the connector portion is made of a hard ceramic material, and a press-fit hole is opened in the side surface of the hard ceramic connector, into which one end of the metal fitting body can be press-fitted, and the inner peripheral surface thereof is provided with a plurality of fixing grooves. One end of the metal fitting body is press-fitted into the press-fit hole, and the outer periphery of the one-end side of the metal fitting body is in the press-fit gap and the plurality of fixing grooves on the inner peripheral surface of the press-fit hole. This hose fitting is characterized by being formed by flowing plastic fluid metal generated by strong pressing.

In the present invention, the hose fastening part consisting of a nipple part and a socket part on one end side of the metal fitting main body is
The nipple part and the socket part can be manufactured by welding or the like on one end of the metal fitting body, or the socket part and the metal fitting body can be manufactured integrally by grinding from a rod-shaped metal material, and then they can be manufactured separately from a metal material. It can also be manufactured by welding the nipple part.

Further, in the present invention, the connector portion at the other end of the metal fitting body is made of a hard ceramic material. The hard ceramic material has high mechanical strength and is preferably hard, such as alumina ceramic, zirconia ceramic, silicon nitride ceramic, and the like.

[Function] The hose cap fitting of the present invention has a socket portion and a nipple portion fixed by making use of the cutting workability and weldability of the metal material by manufacturing the fitting body and the hose fastening portion from a metal material. The main body part can be produced with high precision and efficiency, and the connector part is manufactured from hard ceramic material to exhibit excellent damage prevention properties. Open a press-fit hole that can be press-fitted with a plurality of fixing grooves on the inner circumferential surface, press-fit one end of the metal fitting body into the press-fit hole, and press-fit the press-fit part gap and the inner circumferential surface of the press-fit hole. By forcefully pressing the outer periphery of one end of the metal fitting body and causing plastic fluid metal to flow into the plurality of fixing grooves, the one end of the metal fitting body is press-fitted with the hard ceramic connector. Can be firmly attached to the hole.

The hose fitting of the present invention can exhibit excellent reliability due to the synergistic action of these components.

[Example] Next, an example of the hose cap fitting of the present invention will be described with reference to the drawings.

FIG. 1 is a half-sectional front view showing an embodiment of the hose fitting of the present invention.

In Fig. 1, 1 is the metal fitting main body, 2 is the socket portion, 3 is the nipple portion, 20 is the hard ceramic connector, 21 is the bolt connection hole opened in the hard ceramic connector 20 and can connect other parts, and 24 is the metal fitting body. This is a press mark generated when the outer periphery of one end of part 1 is pressed in a direction perpendicular to the axial direction.

FIG. 2 shows a longitudinal sectional view of the hard ceramic connector 20 in one embodiment of the hose fitting of the present invention shown in FIG.

In FIG. 2, 22 is a fixing groove provided on the inner peripheral surface of a press-fit hole opened on the side surface of the hard ceramic connector 20, 23 is a side hole, and 26 is a press-fit hole.

In one embodiment of the hose fitting of the present invention shown in FIG. 1, the socket portion 2 and nipple portion 3 are fixed in a press-fit hole 26 opened in a portion including the fixing groove 22 in FIG. One end of the metal fitting main body 1 is press-fitted, and then the outer periphery of the one end side of the metal fitting main body 1 that has been press-fitted is strongly pressed in a direction perpendicular to the axial direction, and the plastic fluid metal generated by the pressing is removed. It flows into the press-fitting gap and the fixing groove 22, and as a result, the metal fitting main body 1 and the hard ceramic connector part 20 can be firmly fixed.

FIG. 4 is a half-sectional front view showing another embodiment of the hose fitting of the present invention.

Another embodiment of the hose cap fitting of the present invention shown in FIG. 4 includes a fitting main body 1 to which a socket portion 2 and a nipple portion 3 are fixed as shown in FIG.
The one end side tip 25 of the metal fitting main body 1 is attached to the metal fitting main body 1.
It is made thicker than the central part of the connector body 1 to further improve the pull-out force after the metal fitting body 1 and the hard ceramic connector 20 are press-fitted.

[Effects of the Invention] The hose cap fitting of the present invention is a metal fitting in which the hose fitting part is fixed by making use of the machinability and weldability of the metal material by manufacturing the fitting body and the hose fastening part from a metal material. The main body part can be manufactured with high precision and efficiency, and the connector part is made of hard ceramic material to provide excellent protection against external damage.Furthermore, the main body part of the fitting to which these hose fastening parts are fixed is made of hard ceramic material. It is industrially useful because it can firmly adhere to the connector part and exhibit excellent reliability.

[Brief explanation of drawings]

FIG. 1 is a half-sectional front view showing an embodiment of the hose cap of the present invention, and FIG. 2 is a longitudinal sectional view of a hard ceramic connector 20 in the embodiment of the hose cap of the present invention shown in FIG. FIG. 3 is a half-sectional front view showing a conventional hose fitting, FIG. 4 is a half-sectional front view showing another embodiment of the hose fitting of the present invention, and FIG. 5 is the book shown in FIG. 4. FIG. 7 is a half-sectional front view of a fitting body portion to which a hose fastening portion is fixed, used in another embodiment of the hose cap fitting of the invention. 1: Fitting body, 2: Socket, 3: Nipple, 4: Connector, 5, 21: Bolt connection hole, 6, 23: Side hole, 20: Hard ceramic connector, 22: Fixing groove, 24: Push Trace, 25: One end side tip of the metal fitting body, 26: Press-fit hole.

Claims (1)

[Claims] 1. A hose fastening part consisting of a nipple part and a socket part is provided on one end side of the metal fitting main body, and a connector that can be connected to other parts through a bolt connection hole is provided on the other end side of the metal fitting main body. In the hose cap fitting, the connector portion is made of a hard ceramic material, and one end of the fitting body can be press-fitted into the side surface of the hard ceramic connector, and a plurality of fixing grooves are provided on the inner circumferential surface. A press-fit hole provided is open, and one end of the metal fitting main body is press-fit into the press-fit hole, and a plurality of fixing grooves are formed in the press-fit gap and on the inner peripheral surface of the press-fit hole. A hose cap fitting characterized in that plastic fluid metal generated by strongly pressing the outer periphery of one end side of the fitting main body flows into the hose cap fitting.