JPH0112996B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hose end structure, and in particular, to effective concentration of stress on the reinforcing cord buried in the hose body at the joint between the hose body and the connecting fitting. It is intended to prevent

As a conventionally known hose end structure, for example, there is one that was previously disclosed by the applicant in Japanese Patent Application Laid-Open No. 55-60788.

As shown in Fig. 1, the reinforcing cord b buried in the hose body a is wrapped around a ring c having a rectangular cross section, and the nipple d is attached to the center end of the hose body with a radius. A clamping ring f is placed on the outer circumferential side of the reinforcing cord b at a position closer to the center of the hose body than the ring c, and is brought into contact with a rib e provided so as to protrude outward in the direction;
Arranged further on the outer peripheral side of this clamping ring f,
A ferrule h, which has one end of the end side of the hose body a screwed onto the circumferential surface of the rib e and has a small diameter portion g at the other end, is plastically deformed radially inward from the imaginary line position to the solid line position in the figure. the inner peripheral surface of the clamping ring f
in contact with the outer circumferential surface of the
By engaging with the shoulder of the clamping ring f, a tapered surface i formed on the inner circumferential surface of the clamping ring f and gradually expanding toward the rib side,
By regulating the radial position of the reinforcing cord b and tightening its ferrule h against the rib e, the reinforcing cord b is held between the rib e and the clamping ring f. be.

According to this end structure, detachment of the hose body a from the nipple d is reliably prevented by pressing the reinforcing cord b against the rib e by the clamping ring f and the ferrule h, and the internal pressure is prevented. In time,
The expansion of the hose body a near the nipple is effectively prevented by the tapered surface i of the clamping ring f.

However, in this prior art, in order to prevent the hose body a from separating from the nipple d, a reinforcing cord b is embedded in the hose body a.
Based on the displacement of the clamping ring f in the rib direction,
Since the reinforcing cord b is locally sandwiched between the rib e and the ring c, and between the ring c and the clamping ring f, the reinforcing cord b is subjected to large stress concentration at these sandwiched parts. Therefore, there was a problem in that the reinforcing cord b was damaged relatively quickly at the portion where the reinforcing cord b was held.

Moreover, in this prior art, since the reinforcing cord b is wrapped around the ring c having a rectangular cross section, when tension is applied to the reinforcing cord b, stress concentration also occurs in the portion corresponding to the corner of the ring c. As a result, there was another problem in that the reinforcing cord b was also damaged at an early stage in those parts.

The present invention advantageously solves the problem of the prior art, and in particular, a reinforcing cord embedded in the hose body is disposed between the tapered surfaces of both the inner and outer sleeves, which both slope in the same direction. Then, by moving the outer sleeve in the axial direction of the hose with a split ring that contacts the end surface of the outer sleeve, and clamping the reinforcing cord between the inner and outer sleeves, the reinforcing cord can be uniformly and sufficiently spread over the entire circumference of the hose body. The present invention provides an end structure of a hose that can easily obtain a high tightening force. According to this end structure, the end portion of the reinforcing cord is inserted between the tapered surfaces of the inner and outer sleeves having sufficient length. Since it is clamped entirely, stress concentration on the reinforcing cord is effectively prevented, and its durability is significantly improved compared to the prior art.

Embodiments of the present invention will be described below based on the drawings.

FIG. 2 is a cross-sectional view of main parts showing an embodiment of the present invention, in which 1 is a hose main body, 1a is a rubber coating wire located at the innermost side of the hose main body, 1
b indicates an inner rubber located on the outer peripheral side of the rubber coated wire, and 1c indicates a filler made of, for example, synthetic resin, located further outside.

Here, when the internal pressure acting on the hose body 1 is reduced, the rubber coated wire 1a prevents the fluid from being pushed out inside the hose body 1 due to the pressure of the fluid leaking to the outside of the inner rubber 1b, for example. function to do so.

Further, 1d indicates a hoop tension member located outside the filler to counter the stress directed in the radial direction of the hose body, and in the illustrated example, this is a rubber coated wire, but the wire to be rubber coated is It is also possible to use a member having a U-shaped, I-shaped, Z-shaped or other cross-sectional shape, and by bringing such a rubber coated wire into direct contact with the outer surface of the filler 1c, the radial stress can be more effectively reduced. It can be countered advantageously. Note that 1e, 1
f and 1g indicate a two-layer rubber-coated reinforcing cord and a weather-resistant jacket rubber, respectively.

Furthermore, in the figure, 4 indicates a pipe to which a flange or other connector is attached, and 7 indicates a nipple fixed to the outer peripheral surface of this pipe.

Here, the end surfaces of the rubber coated wire 1a and the inner rubber 1b of the hose body 1 are positioned opposite to the end surface of the pipe 4, and the outer periphery of the inner rubber 1b is filled with a filler 1c and a hoop member. A spacer split ring 5 that is in contact with the end face of 1d and has a thickness equivalent to the combined thickness of the end face.
The pipe 4 and the spacer split ring 5 are placed on the nipple 7 that extends from the pipe 4 to the spacer split ring 5 and circumscribes both of them.
The inner rubber 1 protrudes radially inward from between
A protrusion 7a that contacts b is provided.

Further, here, a flange 7b protruding radially outward is provided on the end portion of the hose body 1 of the nipple 7, and a thread 7c is provided on the outer peripheral surface of the flange 7b.
An inner sleeve 8 located on the outside of the hoop tension member 1d is screwed onto the central portion of the hose body 1, and two layers of reinforcing cords 1e, 1f and outer sleeves are placed on the outer peripheral surface of the inner sleeve 8. 1 g of rubber to be coated is placed one after another. Here, the reinforcing cords 1e and 1f are connected from the outer peripheral surfaces of the inner sleeve 8 and nipple 7 to the flange 7b.
The outer cover rubber 1g extends halfway along the outer peripheral surface of the inner sleeve.

Here, the outer circumferential surface of the inner sleeve 8 has two tapered surfaces 8a and 8b, which have the largest diameter at the central portion in the longitudinal direction and gradually become smaller in diameter toward both ends.
are respectively formed, and an outer sleeve 9 is disposed on the outer peripheral side of the reinforcing cord 1f at a position corresponding to the tapered surface 8a located on the end side of the hose body 1 among these tapered surfaces. This outer sleeve 9
The inner sleeve 8 has a diameter that gradually decreases toward the end of the hose body 1 on its inner peripheral surface, and has an inner sleeve 8 with respect to the axis.
It has a tapered surface 9a that is inclined at the same angle as the tapered surface 8a of the hose body 1, and has a radial portion on the end surface of the hose main body 1 that is inclined in a direction protruding toward the end side. , has a tapered surface 9b forming a large angle with respect to the axis.

Further, a ring 1 is attached to the flange 7b on the central side of the hose body 1 with the reinforcing cords 1e and 1f separated.
0, and a split ring 11 is placed between this ring 10 and the outer sleeve 9.

This split ring 11 is made up of a plurality of arc-shaped segments, and the end surface of the split ring 11 on the outer sleeve side is a tapered surface 11 that makes surface contact with the tapered surface 9b of the end surface of the outer sleeve.
It has a. When arranging such a split ring 11 having an appropriately selected width at a predetermined position in the radial direction between the outer sleeve 9 and the ring 10, it is necessary to push it radially inward, and the outer sleeve 9 moves toward the center of the hose body 1 in the axial direction while the inner sleeve 8 does not change its position. Therefore, the reinforcing cords 1e and 1f located on the inner sleeve occupy a large area. The tapered surfaces 8a and 9a are clamped with a strong force and sufficiently uniformly in both the lengthwise direction and the circumferential direction.

Therefore, not only is a sufficiently large tightening force applied to the reinforcing cords 1e and 1f uniformly generated over the entire circumference of the hose body 1, but also the reinforcing cords 1
Since the reinforcing cords 1e and 1f are subjected to almost uniform stress over the entire length of their clamped portions, early damage to the reinforcing cords 1e and 1f due to the action of local stress on the reinforcing cords 1e and 1f is avoided. This is effectively prevented and the durability of the reinforcing cords 1e and 1f is significantly improved.

Further, in this example, the flange 7b
Also between the ring 10 and the reinforcing cords 1e and 1f,
A clamping force is generated against the hose body 1, and the hose body 1 is connected to the nipple 7 as a connecting fitting with satisfactory strength.

Reference numeral 12 indicates an outer cylinder located at the outermost side, and this outer cylinder 12 can be fixed in a predetermined manner by screwing the thread provided on the inner side of the end of the hose body 1 with the thread 7c of the flange 7b. and serves as a cover member. In addition, this outer cylinder 12
has a small diameter portion 12a on the central side of the hose body 1.
This small diameter portion 12 which has a
a effectively prevents water and other substances from entering in the direction of the outer sleeve 9.

Although this invention has been explained above based on illustrated examples,
In cooperation with the tapered surface 9b of the outer sleeve 9 provided on the end surface of the hose body 1 and the tapered surface 11a of the split ring 11 provided on the end surface of the center portion of the hose body, the outer sleeve 9 Instead of applying thrust toward the center of the hose body 1, the split ring 1
1, the tapered surface provided on the side surface of the end of the hose body 1, and the tapered surface provided on the end surface of the center portion of the hose body 1, of the ring 10, the outer sleeve 9,
It is also possible to apply a thrust toward the center of the hose body 1, and it is also possible to omit the tapered surface 8b that gradually becomes smaller in diameter toward the center of the hose body 1 from the inner sleeve 8.

Further, the reinforcing cord buried in the hose main body 1 can be made into only one layer, and furthermore, when the reinforcing cord in the hose main body 1 extends to the outer circumferential surface of the tapered surface 8a of the inner sleeve 8, Since there is no need to extend the reinforcing cord along the flange 7b and hold it in a predetermined position by the ring 10 when the split ring 11 is pushed in, in such a case, the ring 10 is omitted, The width of the split ring 11 can be set to a size that allows surface contact with both the outer sleeve 9 and the flange 7b at the same time.

Thus, according to the present invention, in particular, the reinforcing cord of the hose body 1 is inserted between the tapered surface 8a provided on the outer circumferential surface of the inner sleeve 8 and the tapered surface 9a provided on the inner circumferential surface of the outer sleeve 9. Overall clamping over a sufficient length can effectively prevent stress concentration on the reinforcing cord, resulting in a significant improvement in its durability.

Moreover, by making the tapered surfaces 8a, 9a of the inner and outer sleeves 8, 9 gradually smaller in diameter toward the end of the hose body 1, the action of tension on the hose body 1 and, as a result, on the reinforcing cord is reduced. Therefore, an external force in the direction of increasing the clamping force of the reinforcing cord acts on the outer sleeve 9, which extremely effectively prevents the hose body 1 from separating from the sleeve 7 when tension is applied to the hose body 1. can do.

[Brief explanation of drawings]

FIG. 1 is a partial sectional view showing a conventional example, and FIG. 2 is a sectional view of essential parts showing an embodiment of the present invention. 1... Hose body, 1a... Rubber coated wire, 1b... Inner rubber, 1c... Filler,
1d...Hoop tension member, 1e, 1f...Rubber coating reinforcement cord, 1g...Rubber covering, 4...
Pipe, 5...Spacer split ring, 7...Nipple, 7a...Protrusion, 7b...Flange, 7c...
...Screw thread, 8...Inner sleeve, 8a, 8b, 9
a, 9b, 11a...Tapered surface, 9...Outer sleeve, 10...Ring, 11...Split ring, 12...
...Outer cylinder, 12a...small diameter part.

Claims (1)

[Claims] 1. A nipple 7 fixed to the outer peripheral surface of the pipe 4,
A flange 7b of this nipple is provided on the end side of the hose body 1 and projects radially outward.
an inner sleeve 8 connected to the central portion of the hose body of the nipple; a tapered surface 8a provided on the outer peripheral surface of the inner sleeve and whose diameter gradually decreases toward the flange; and at least this tapered surface. The reinforcement cord 1e of the hose body extended to
1f, and an outer sleeve 9 which is disposed on the outer circumferential side of this reinforcing cord and has a tapered surface 9a formed on the inner circumferential surface thereof, the diameter of which gradually decreases toward the flange side, and which is inclined at an angle equal to the tapered surface 8a of the inner sleeve 8.
A split ring 11 is interposed between the outer sleeve and the flange, and a split ring 11 is formed on the end surface of the center portion or the end surface of the hose body of the split ring, and the outer sleeve is connected to the hose body. A hose end structure comprising a tapered surface 11a that presses toward the center of the hose.