JPH08170772A - Hose joint fitting - Google Patents

Abstract

PURPOSE: To provide a hose joint fitting capable of sufficiently cope with the use in the corrosive liquid as the environmental condition with a simple struc ture, and improving the durability and the service life of the hose. CONSTITUTION: An inner surface 4x on the tip side of a socket piece 4b consists of a tapered part 8 to cope with the fluctuation of the outer diameter of a hose and a pressing part 9 abutted on the outer circumferential surface of an outer rubber layer 3. The taper angle α of the tapered part 8 of the inner surface 4x on the tip side of the socket piece 4b is preferably set in the range of 5-25 deg., and the projection formed on the pressing part 9 is preferably formed in the range of 0.5-1.5mm in diameter and 0.2-0.5mm in height.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hose joint fitting, and more particularly to a hose joint fitting such as a high pressure hose used in a power steering device (steering device) of a truck system.

[0002]

^2. Description of the Related Art Conventionally, a high pressure hose used for a power steering device (steering device) of a truck system has a pressure of 130 to 160 Kgf / cm ² and a temperature range of −4 depending on its usage conditions.
A load such as repeated rocking due to engine vibration is applied at 0 ° C to + 150 ° C. As a structure of such a high-pressure hose, for example, as shown in FIG. 7, a reinforcing layer 2 is braided on an inner rubber layer 1 and an outer rubber layer 3 is coated thereon, and the reinforcing layer 2 is provided. As the material of the above, a high-strength hard steel wire plated from the viewpoint of strength is used, and as a method of braiding, a braided braid 2a as shown in FIG.
Spiral winding 2b as shown in Fig.
Layered. The outer diameter of the high pressure hose as described above is generally ± 0.5 mm due to the manufacturing capability.
It has a tolerance of ~ ± 1.0 mm.

By the way, as a method of connecting the above-mentioned high-pressure hose to the fitting, generally, one end of the hose body is inserted between the nipple fitting and the socket fitting,
It is integrated by caulking the socket fittings.
At this time, the nipple socket is inserted between the nipple fitting 4a and the socket fitting 4b as shown in FIGS. 10 to 12 in order to maintain the performance (quality such as strength, pulling force, durability, etc.) with respect to usage conditions. The outer surface rubber layer 3 on one end side of the hose body 5 is removed, and the reinforcing layer 2 is exposed. By tightening the tip side of the socket fitting 4b, the hose body 5 is placed inside the socket fitting 4b. The formed groove protrusions 6 bite into the reinforcing layer 2 so as to be integrally fixed.

[0004]

[Problems to be Solved by the Invention] Under actual vehicle use conditions for a high-pressure hose, the bending radius of the hose may become smaller due to the narrow piping space in the engine room, and there may be cases where the lower piping of the vehicle is designed. There is. In addition, users have been improving the aesthetic appearance of car stains. Car wash machines (maximum car wash water discharge pressure is 80 to 120 Kgf / cm
The number of car washes in ² ) also tends to increase.

Considering such a situation of use, for example, when the high pressure hose is piped after the front tires in the lower pipe of the vehicle and the mounting bend radius of the metal fitting root portion becomes small, it is shown in FIGS. 13 and 14. As described above, in the base portion 7 of the metal fitting, the inner surface 4x of the tip of the socket metal fitting 4b and the hose body 5 are
A gap X is formed between the outer surface rubber layer 3 at one end thereof. Then, when the tire winds rainwater or snow-melting salt for road freezing during running, it is directly poured into the fitting metal fittings of the high-pressure hose, and the corrosive liquid Q such as water from the high-pressure car wash at the time of car washing is used in the socket metal fittings. It is assumed that a gap X between the inner surface 4x on the distal end side of 4b and the outer rubber layer 3 at one end of the hose body 5 penetrates from the direction of the arrow.

As a result, the corrosive liquid such as water that has penetrated from the metal fitting root portion 7 corrodes the reinforcing layer 2 made of a metal wire, and the reinforcing layer 2
The strength of the high pressure hose is deteriorated by the action of operating conditions (repeating pressure, rocking, etc.), which accelerates the fatigue caused by rusting the reinforcing layer 2 and causes oil leakage due to breakage. There is a possibility that the problem of shortening the life may occur.

The present invention was devised by focusing on the above-mentioned conventional problems, and makes the structure of the high pressure hose complicated,
(EN) Provided is a hose joint fitting which has a simple structure and can sufficiently cope with use under environmental conditions without lowering durability and increasing cost, and which can extend the durability and life of a hose. The purpose is.

[0008]

In order to achieve the above object, the present invention provides a hose outer diameter on the inner surface of the tip end of the socket fitting located at the end of the outer rubber layer of the hose body with the reinforcing layer exposed. A taper part that corresponds to dimensional changes,
The gist is that a pressing portion that abuts the outer peripheral surface of the outer rubber layer is formed.

The taper angle of the end portion of the outer rubber layer and the taper angle of the taper portion of the inner surface on the tip side of the socket fitting are
Set to a range of 5 to 25 degrees, a pressing portion formed on the tip side of the socket fitting is formed with a protrusion that bites into the outer peripheral surface of the outer rubber layer, and the protrusion formed on the pressing portion is a circular cross section. Formed in an arc shape, this protrusion has a radius of 0.5 mm ~ 1.
It has a size of 5 mm and a height of 0.2 to 0.5 mm.

[0010]

The present invention is constructed as described above, and when the outer diameter of the hose fluctuates, the inner surface of the tip of the socket fitting located at the end of the outer rubber layer of the hose body with the reinforcing layer exposed is protected from fluctuations in the outer diameter of the hose. Since the corresponding tapered portion and the pressing portion that abuts on the outer peripheral surface of the outer rubber layer are formed, even if the outer diameter of the hose changes, or if the hose body is bent from the fitting root, The outer surface of the hose body is compressed by the taper part formed on the inner surface at the tip side of the socket metal fitting, which can effectively prevent the corrosive liquid of the external environment from entering the reinforcing layer, which may cause rusting of the reinforcing layer. The life of the hose body can be extended without lowering the durability.

In addition, by forming a protrusion that cuts into the outer peripheral surface of the outer rubber layer in the pressing portion formed on the tip side of the socket fitting, even if the outer diameter of the hose varies, the fitting of the hose body Even if the hose body is bent from the root part, the hose body part can always stably compress the outer surface of the hose body, and in addition to the above-mentioned taper compression, the corrosive liquid of the external environment further invades the reinforcing layer. It can be effectively prevented.

[0012]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The same components as those in the conventional example are designated by the same reference numerals and the description thereof will be omitted. FIG. 1 is a half sectional view of a connecting portion between a joint fitting 4 and a hose body 5 showing a first embodiment of the present invention, and FIG. 2 is a socket fitting 4b of the joint fitting 4, a reinforcing layer 2 of the hose body 5 and an outer surface rubber. Figure 3 shows an enlarged cross section with layer 3.

Inner surface 4x on the tip side of the socket fitting 4b
Is a taper portion 8 adapted to the fluctuation of the outer diameter of the hose.
And a pressing portion 9 that comes into contact with the outer peripheral surface of the outer rubber layer 3. The taper angle α of the taper portion 8 of the inner surface 4x on the tip side of the socket fitting 4b is preferably set in the range of 5 degrees to 25 degrees. That is, when the taper angle α of the taper portion 8 is set to a large angle of 25 degrees or more, the hose pressure bonding amount on the taper surface is weakened so that the sealing effect is small, and when it is set to a small angle of 5 degrees or less, The pressing portion 9 formed on the straight surface of the socket metal fitting 4b presses the outer peripheral surface of the hose body 5 excessively, and the portion P of the outer rubber layer 3 that contacts the socket metal fitting 4b is as shown by the broken line in FIG. A phenomenon (bulge) of bulging to the outside of the metal fitting will occur.

Therefore, the taper angle α is preferably set in the range of 5 ° to 25 °. 3 and 4 show a second embodiment of the present invention. This embodiment shows that even if the outer diameter of the hose body 5 varies, the hose body 5 is bent at the metal fitting root portion 7 to bend the hose. It is configured such that the hose outer surface can always be stably compressed by the metal fitting base portion 7 even if the size of the socket metal is small. The structure is the pressing portion 9 formed on the tip side of the socket metal fitting 4b, and In the vicinity of the root portion 7, a semi-circular arc-shaped protrusion 10 that bites into the outer peripheral surface of the outer rubber layer 3 is formed.

By providing such a semi-circular projection 10, the projection 10 is always in point contact with the outer rubber layer 3 of the hose body 5, and it is effective that a corrosive liquid such as water penetrates into the reinforcing layer 2. Can be prevented. The protrusion 10 formed on the pressing portion 9 has a radius of 0.5 mm to 1.5 mm.
The height is preferably in the range of 0.2 to 0.5 mm.

That is, as for the shape of the protrusion 10, if the protrusion 10a is small and the amount of protrusion is too small as shown in FIG. 5, there is no effect of preventing the penetration of the corrosive liquid, and as shown in FIG. Is too large, the amount of compression of the outer rubber layer 3 of the hose body 5 at the metal fitting root 7 increases too much, and a part P of the outer rubber layer 3 bulges outside the metal fitting (bulge).
Will occur.

Therefore, the protrusion 10 formed on the pressing portion 9
Is preferably formed with a radius of 0.5 mm to 1.5 mm and a height of 0.2 mm to 0.5 mm. As described above, the tip-side inner surface 4x of the socket fitting 4b is configured by the taper portion 8 adapted to the fluctuation of the outer diameter dimension of the hose and the pressing portion 9 abutting on the outer peripheral surface of the outer rubber layer 3. Even if the outer diameter of the hose changes, or if the hose body 5 is bent from the metal fitting root 7, the socket metal fitting 4b
The taper portion 8 formed on the inner surface 4x on the tip side of the hose body 5
The outer surface of the hose can be compressed to effectively prevent the corrosive liquid from the external environment from entering the reinforcement layer, and extend the life of the hose body without lowering the durability due to rusting of the reinforcement layer. Can be done.

Further, by forming the protrusion 10 that bites into the outer peripheral surface of the outer rubber layer 3 in the pressing portion 9 formed on the tip side of the socket fitting 4b, even if the outer diameter of the hose varies, Even if the hose body 5 is bent from the metal fitting root 7 of the body 5, the metal fitting root 7 can always stably compress the outer surface of the hose body 5. In addition to the taper compression described above, the corrosive liquid of the external environment can be further added. It is possible to effectively prevent the invasion of the reinforcing layer.

[0019]

As described above, according to the present invention, the inner surface of the tip end side of the socket fitting located at the end of the outer rubber layer of the hose body with the reinforcing layer exposed as described above is adapted to the variation of the outer diameter of the hose. Since the tapered part and the pressing part that abuts the outer peripheral surface of the outer rubber layer are formed, the structure of the high pressure hose is not complicated, and the durability is not lowered and the cost is not increased, and the structure is simple and the environmental conditions are high. It is possible to make a high-pressure hose that can be sufficiently used even in the above, and it is also effective in extending the durability and life of the hose.

[Brief description of drawings]

FIG. 1 is a half sectional view of a connecting portion between a joint fitting and a hose body showing a first embodiment of the present invention.

2 is an enlarged cross-sectional view of a socket metal fitting of the joint metal fitting of FIG. 1, a reinforcing layer and an outer rubber layer of the hose body.

FIG. 3 is a half sectional view of a connecting portion between a joint fitting and a hose body showing a second embodiment of the present invention.

4 is an enlarged cross-sectional view of a socket fitting of the fitting fitting of FIG. 3, a reinforcing layer and an outer rubber layer of the hose body.

FIG. 5 is a view showing a shape of a protrusion formed on the pressing portion of the present invention,
It is explanatory drawing at the time of comparing with the shape of another protrusion.

FIG. 6 is a view showing a shape of a protrusion formed on the pressing portion of the present invention,
It is explanatory drawing at the time of comparing with the shape of another protrusion.

FIG. 7 is a partial cross-sectional view showing the structure of a conventional high pressure hose.

FIG. 8 is an explanatory view of a braided reinforcing layer of a conventional high pressure hose.

FIG. 9 is an explanatory diagram of a spirally wound reinforcing layer of a conventional high pressure hose.

FIG. 10 is an explanatory view showing a state where an outer rubber layer on one end side of a conventional hose body is removed.

FIG. 11 is a cross-sectional view showing a joined state of a conventional hose body and a caulking metal fitting.

FIG. 12 is a cross-sectional view showing a state in which a conventional hose body and a caulking fitting are joined and caulked.

FIG. 13 is a half cross-sectional view of a connection portion between a conventional fitting and a hose body.

14 is an enlarged cross-sectional view of the socket metal fitting of the joint metal fitting of FIG. 13, the reinforcing layer and the outer rubber layer of the hose body.

[Explanation of symbols]

 2 Reinforcement layer 3 Outer rubber layer 3a Terminal part of outer rubber layer 4 Joint metal fitting 4a Nipple metal fitting 4b Socket metal fitting 4x Inner surface of tip side of socket metal fitting 5 Hose body 7 Metal fitting root portion 8 Tapered portion 9 Holding portion 10 Protrusion α taper angle

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yoshiyuki Koga, 3-1-1 Hinodai, Hino City, Tokyo Hino Motor Co., Ltd. (72) Toshiaki Aizawa 3-1-1, Hinodai, Hino, Tokyo Within Automotive Industry Co., Ltd.

Claims (4)

[Claims] Claim: What is claimed is: 1. A reinforcing layer is braided on an inner rubber layer, and an outer rubber layer is provided on the braided layer. One end of the hose body is removed to expose a reinforcing layer of a predetermined length by removing the outer rubber layer. Insert the exposed reinforcing layer into the nipple fittings,
A hose joint fitting configured such that an outer peripheral surface thereof is caulked and fixed by a socket fitting having a groove projection portion formed on an inner surface thereof, wherein the socket is located at a terminal portion of an outer rubber layer of the hose body with the reinforcing layer exposed. A hose joint fitting, characterized in that a taper portion corresponding to a change in outer diameter of the hose and a pressing portion abutting on the outer peripheral surface of the outer rubber layer are formed on the inner surface at the tip side of the fitting. 2. The hose joint fitting according to claim 1, wherein the taper angle of the terminal portion of the outer rubber layer and the taper angle of the taper portion of the inner surface on the tip side of the socket fitting are set within a range of 5 degrees to 25 degrees. 3. The hose joint fitting according to claim 1 or 2, wherein the pressing portion formed on the tip end side of the socket fitting has a projection that bites into the outer peripheral surface of the outer rubber layer. 4. The projection formed on the pressing portion is formed in an arcuate cross section, and the projection has a radius of 0.5 mm to 1.5 mm and a height of 0.2 mm to 0.5 mm. Hose fittings.