JP2011133045A - Hose - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hose which improves sealing performance of the attaching part of a connection fitting. <P>SOLUTION: Two sets of cords 4 and 5 spirally wound in opposite directions to each other are braided so that each cord of one set 4 is overlapped with every third cord of the other set 5 at its upper side or lower side, and every third overlapped portion at the upper side or lower side continues in a circumferential direction of the hose. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a hose, and more particularly, to a hose with improved sealing performance of an attachment part of a connection fitting.

  Conventionally, a hose having a structure in which a reinforcing layer and an outer rubber layer are sequentially laminated on an inner rubber layer is used as a pressure-resistant rubber hose used for a hydraulic hose of a construction machine. For this reinforcing layer, a braid in which cords made of steel wires or organic fibers are knitted in a blade shape is often used. For example, as shown in Patent Document 1, most of the braids are two pairs wound in opposite directions. This cord has a so-called 2-over-2 structure in which each cord of one set is braided so as to overlap every other cord of the other set.

  As shown in FIG. 3, this 2-over-2 braid has a structure in which every two cords 6 and 7 overlap each other (see the shaded area) in the longitudinal direction of the hose. Since it comes to be continuous, the cross section of the hose is not a circle but a substantially polygonal shape. For this reason, there is a problem in that it is difficult to improve the sealability of the attachment portion because the adhesion between the connection fitting and the hose attached so as to caulk the reinforcing layer at the end portion of the hose is deteriorated.

JP-A-6-159559

  The objective of this invention is providing the hose which improved the sealing performance of the attaching part of a connection metal fitting.

  The hose of the present invention that achieves the above object is a hose in which a reinforcing layer formed by braiding a plurality of cords made of metal wires or organic fibers and an outer rubber layer are sequentially laminated on an inner rubber layer. The two sets of cords wound spirally around are braided so that each of the cords of one set overlaps with each other of the cords of the other set on the upper side or the lower side, and the 2 A portion overlapping every other upper side or lower side is continuous in the hose circumferential direction.

  According to the hose of the present invention, in a hose using a braid of a so-called 2-over-2 structure as a reinforcing layer, every two upper or lower overlapping parts are continuous in the hose circumferential direction. Since the cross section is circular, the sealing performance of the connection part of the connection fitting can be improved.

1 is a partially cutaway perspective view of a hose according to an embodiment of the present invention. It is a partially expanded view of the reinforcing layer shown in FIG. FIG. 6 is a perspective view in which a hose using a braid having a conventional 2-over-2 structure as a reinforcing layer is partially cut away.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows a hose according to an embodiment of the present invention.

  This hose is obtained by sequentially laminating a reinforcing layer 2 and an outer rubber layer 3 on an inner rubber layer 1. The reinforcing layer 2 is composed of a braid formed by braiding cords 4 and 5 made of metal wires or organic fibers. A steel wire is preferably used as the metal wire, and an aromatic polyamide fiber is preferably used as the organic fiber.

  In such a hose, the braid constituting the reinforcing layer 2 is a so-called 2-over-2 braid, and every four cords 4 and 5 wound spirally so as to be opposite to each other. The portion that overlaps (see the shaded portion) is continuous in the hose circumferential direction.

  Since such a braid is used for the reinforcing layer 2, the cross section of the hose is circular, so that the adhesion between the connection fitting and the hose is improved, and the sealing performance of the attachment portion can be improved.

  In order for the portions where the cords 4 and 5 overlap every other two to be continuous in the circumferential direction of the hose, as shown in FIG. ) The cord 5A wound in the opposite direction (for example, counterclockwise) in which the cord 4A (first cord) wound first is overlapped from the upper side is wound next to the cord 4A in the same direction. Contrary to the case of the cord 4A, the cord 4B (second cord) is overlapped from the upper side, and the cord 5B wound in the opposite direction in which the cord 4A overlaps second is corded with respect to the cord 4B. Just as in the case of 4A, they may be stacked from the lower side. These relationships are established even if the upper and lower code overlaps are exchanged.

  In the above embodiment, the case where the reinforcing layer 2 is a single layer has been exemplified, but a plurality of reinforcing layers 2 may be laminated via an intermediate rubber layer.

  Although the use of the hose of this invention is not specifically limited, It can use suitably for the hydraulic hose used for the power transmission of construction machines, such as a power shovel and a bulldozer.

1 Internal rubber layer 2 Reinforcing layer 3 External rubber layer 4, 5, 6, 7 Cord

Claims (5)

In a hose in which a reinforcing layer formed by braiding a plurality of cords made of metal wires or organic fibers and an outer rubber layer are sequentially laminated on the inner rubber layer,
Two sets of the cords that are spirally wound around the reinforcing layer in a reverse direction so that one set of cords overlaps with the other set of cords at the top or bottom of every other cord. A hose that is braided and that overlaps every other two at the upper or lower side in the hose circumferential direction.   The other set of codes in which the first code of the one set overlaps first with respect to the second code of the same set next to the one set of codes is opposite to the first code. 2. The hose according to claim 1, wherein the other cords in which the first cord overlaps second are overlapped so as to be on the same side with respect to the second cord.   The hose according to claim 1 or 2, wherein the metal wire is a steel wire.   The hose according to claim 1 or 2, wherein the organic fiber is an aromatic polyamide fiber.   The hose according to claim 1, which is a hydraulic hose for construction machinery.

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