JPH0668347B2 - Fitting with seal ring - Google Patents

Description

TECHNICAL FIELD The present invention relates to an improvement of a caulking type joint fitting.

[Conventional technology]

As a conventional joint fitting of the type in which a socket, which is a hose fixing member, is caulked from the outer periphery to connect a hose, there is, for example, one shown in FIGS. 3 and 4. In FIG. 3, reference numeral 1 denotes a joint body, from which a cylindrical nozzle-shaped hose insertion portion 3 is extended from the spanner engagement portion 2 to one side in the axial direction, and a mounting screw portion 1A is provided on the opposite side. . The outer peripheral surface of the hose insertion portion 3 has a plurality of annular grooves for preventing the hose from coming off.
3a is formed, and a flange-shaped hooking portion 4 is annularly projected near the spanner engaging portion 2. The fluid flow hole 5 penetrates the shaft portion of the joint body 1. Reference numeral 6 denotes a hose that is inserted into the hose insertion portion 3 and is generally made of a flexible material such as rubber or synthetic resin. A socket 7 which is a metal hose fixing member is externally fitted to the hose 6 and the hooking portion 4 which are inserted into the hose inserting portion 3. In this socket 7, a portion corresponding to the hose insertion groove 3a of the hose insertion portion 3 is a caulking portion 8.

The end of the socket 7 on the side of the wrench engaging portion 2 and the caulking portion 8 are pressed from the outer peripheral surface in the axial direction of the joint body 1 by a caulking machine (not shown), and the hose 6 together with the socket 7 is attached. As shown in FIG. 4, the diameter of the hose 6 is reduced and deformed so that the inner peripheral surface of the hose 6 is firmly inserted into the hose insertion groove 3a of the joint body and fixed, and at the same time, the end of the socket 7 is locked to the locking portion 4. Alternatively, the end of the socket 7 on the wrench engaging portion 2 side is preliminarily pressed from the outer circumference and the hose 6 is inserted into the jointed body 1 and the caulking portion 8 of the socket 7 is caulked and fixed.

[Problems to be Solved by the Invention]

However, in such a conventional caulking type fitting, when the inner surface of the hose 6 is made of a highly flexible material, the hose insertion portion 3 and the hose insertion portion 3 are not heated due to the heat cycle due to the temperature change of the fluid flowing in the hose. There is a problem that the fixation with the hose 6 is loosened, the sealing property is lowered, and the fluid leaks to the outside.

Further, since the socket 7 is caulked with the caulking portion 8 and the bent portion of the socket end, caulking work is troublesome.

Therefore, the present invention has been made by paying attention to the above-mentioned conventional problems, and an object of the present invention is to hose insertion portion 3
The above problem is solved by using a joint fitting with a seal ring in which a seal ring is interposed between the hose 6 and the hose 6.

[Means for Solving the Problems]

This invention inserts a hose into an annular space formed by a hose fixing member and a hose inserting portion of a metal fitting body, presses the hose fixing member from the outside to reduce the diameter, and tightens the hose. In a joint fitting for hose connection configured to be fixed to a portion, while fitting a seal ring on the outer peripheral surface of the hose insertion portion, which is off the portion facing the caulking portion of the hose fixing member, near the base portion, The hose fixing member is characterized in that a protruding portion is formed on an inner peripheral surface of a portion facing the seal ring so as to protrude inward from an inner peripheral surface of the caulking portion.

[Action]

When the socket is crimped, the hose at the position corresponding to the crimped portion of the socket is pressed, the wall thickness of the hose at that portion is reduced, and the reduced amount escapes to both sides of the crimped portion. As a result, a stress that increases the wall thickness acts on the end of the hose. In particular, the portion that escapes toward the base side of the hose insertion portion is restricted to escape in the outer radial direction by the protrusion provided on the inner surface of the hose fixing member, and escapes mainly in the inner diameter direction. Therefore, the seal ring is strongly pressed against the hose insertion portion 3 by the inner peripheral surface of the hose, and high sealing property is obtained. Further, since only the thin caulking portion of the socket needs to be caulked, and the hose terminal side portion having a strong resistance is not caulked, caulking work is easy.

〔Example〕

Hereinafter, the present invention will be described with reference to the drawings. 1 and 2 are diagrams showing an embodiment of the present invention. The same or corresponding parts as those of the conventional example are designated by the same reference numerals,
A duplicate description will be omitted.

The base of the hose insertion portion 3 of the joint body 11 is provided with a male screw portion 13 for mounting the socket 12 which is a hose fixing member. An annular groove 14 is provided on the outer peripheral surface of the hose insertion portion near the base portion, and a seal ring 15 is fitted therein.

The socket 12 is an inner peripheral surface of the socket 12 that is close to the base portion outside the thin caulking portion 8 and that corresponds to the seal ring 15, and a projecting portion 16 that annularly protrudes inward from the inner peripheral surface of the caulking portion 8. have. The inner diameter of the protrusion 16 is such that the hose 6 inserted into the hose insertion portion 3 can be fitted therein.

The end portion of the socket 12 near the protruding portion 16 is bent inward through the relief portion 17 into a flange shape, and the inner peripheral surface thereof has the joint main body.
A female screw 18 that is screwed into the male screw portion 13 of 11 is formed.

The hose 6 is connected to the joint body 11 as follows.

With the seal ring 15 attached to the annular groove 14 provided at the position near the base of the joint body 11, the socket is attached to the hose insertion portion 3.
12 is covered, and the female screw 18 of the socket is screwed to the male screw portion 13 of the joint body 11 by screwing. Next, the hose 6 is inserted into the hose insertion portion 3 of the joint body 11. At this time, the hose 6 is deeply inserted until the insertion end of the hose 6 completely rides over the seal ring 15 mounted on the hose insertion portion 3.

After that, the caulking portion 8 of the socket 12 is pressed in the axial direction of the joint body 11 by a caulking machine (not shown) to be permanently deformed, and the hose 6 is fixed to the hose inserting portion 3 (see FIG. 2). In this embodiment, the crimping portion 8 of the socket 12 is crimped at six places in the longitudinal direction by hexagonal fastening or octagonal fastening. The caulking portion 8 of the socket 12 is deformed and partially reduced in diameter, and the hose 6 is pressed against the outer surface of the hose insertion portion 3. As a result, the inner surface of the hose 6 bites into the groove 3a to prevent it from coming off, and the thickness of the caulking portion 8 is reduced. The reduced thickness of the hose in the crimped portion 8 escapes to both sides of the crimped portion 8. As a result, a stress that increases the wall thickness acts on the end of the hose. In particular, the portion that escapes to the base side of the hose insertion portion 3 is restricted to escape in the outer diameter direction by the protrusion 16 provided on the inner surface of the socket 12, and mainly escapes in the inner diameter direction. Therefore, the seal ring 15 is strongly pressed by the inner peripheral surface of the hose.

Thus, in this embodiment, the caulking force is applied only to the thin caulking portion 8 of the hose fixing member 12, and the caulking work is easy. Moreover, the seal ring 15 at a position outside the caulking portion 8 can be brought into close contact with the inner surface of the hose by utilizing the stress generated in the hose due to the caulking, and a complete seal can be achieved.

In the above embodiment, the socket 12 is attached to the joint body 11.
Explained the joint fittings of the type that was pre-joined via the screws 13 and 18 before caulking, but of course it also applies to the joint fittings of the type that separates both members as shown in Figs. 3 and 4. be able to.

Further, as the caulking method of the socket 12, as in the embodiment, other than the hexagonal tightening or the octagonal tightening that pressurizes places in the length direction,
Vertical tightening with continuous pressure in the length direction is also possible.

〔The invention's effect〕

As described above, according to the present invention, in the caulking type joint fitting, the seal ring is fitted to the outer peripheral surface of the hose insertion portion that is close to the base portion and is out of the portion of the hose fixing member facing the caulking portion. At the same time, the hose fixing member has a protruding portion formed on the inner peripheral surface of the portion corresponding to the seal ring so as to protrude inward from the inner peripheral surface of the caulking portion, so that only the thin caulking portion of the hose fixing member is formed. If the caulking force is applied, it is possible to completely seal the inner surface of the hose with the seal ring located outside the caulking portion, and it is possible to obtain the effect of achieving high sealing performance and improved caulking workability. .

[Brief description of drawings]

FIG. 1 is a semi-longitudinal sectional view before caulking of an embodiment of the present invention,
2 is a semi-longitudinal sectional view after caulking, FIG. 3 is a semi-longitudinal sectional view before caulking showing an example of a conventional fitting, and FIG. 4 is a semi-longitudinal sectional view after caulking. . In the figure, 1 and 11 are joint bodies, 3 is a hose insertion part, 6 is a hose, 7 and 12 are hose fixing members, 8 is a caulking part, 15 is a seal ring, and 16 is a protruding part.

Claims (1)

[Claims] 1. A hose for a metal fitting body, wherein a hose is inserted into an annular space formed by a hose fixing member and a hose inserting portion of the metal fitting body, and the hose fixing member is pressurized from the outside to reduce the diameter to tighten the hose. In a hose connecting fitting configured to be fixed to an insertion part, a seal ring is fitted to an outer peripheral surface of the hose insertion part, which is off a portion facing the caulking part of the hose fixing member, close to the base part. The joint fitting with a seal ring, wherein the hose fixing member has a protruding portion formed on an inner peripheral surface of a portion facing the seal ring so as to protrude inward from an inner peripheral surface of the caulking portion.