US-20260126138-A1 - WIRE SPIRAL REINFORCED RUBBER HOSE

Abstract

Disclosed is a low-cost, flexible wire spiral reinforced rubber hose that does not cause occurrence of a pinhole burst. The wire spiral reinforced rubber hose includes a hose main body 10 that includes reinforcing layers 14 , 16 , 18 , and 20 formed by helically wound wire bundles 31 , 32 in which a plurality of metal wires 30 adjoin side by side, respectively. The wire density of the metal wires 30 in the reinforcing layers 14 , 16 , 18 , and 20 is set at 40% or higher and 80% or lower, and the wire bundle spacing between the adjoining wire bundles 31 , 32 is set at 1 mm or smaller, whereby an appropriate wire density having a pressure resistance that is not high but moderate is set.

Inventors

• Yoichi KOTANAKA

Assignees

• BRIDGESTONE CORPORATION

Dates

Publication Date

20260507

Application Date

20230707

Priority Date

20221014

Claims (3)

1. 1 . A wire spiral reinforced rubber hose comprising: a hose main body ( 10 ) that includes reinforcing layers ( 14 , 16 , 18 , 20 ) with metal wires ( 30 ) helically wound thereon, wherein the reinforcing layers ( 14 , 16 , 18 , 20 ) are each formed by helically wound wire bundles ( 31 , 32 ) in which a plurality of metal wires ( 30 ) adjoin side by side, respectively, a wire density of the metal wires ( 30 ) in the reinforcing layers ( 14 , 16 , 18 , 20 ) is 40% or higher and 80% or lower, and a wire bundle spacing between the adjoining wire bundles ( 31 , 32 ) is 1 mm or smaller.
2. 2 . The wire spiral reinforced rubber hose according to claim 1 , wherein a wire diameter of the metal wires ( 30 ) is 0.30 mm or greater and 0.80 mm or smaller.
3. 3 . The wire spiral reinforced rubber hose according to claim 1 , wherein, as the reinforcing layers ( 14 , 16 , 18 , 20 ), there are three or more but five or fewer layers.

Description

TECHNICAL FIELD The present invention relates to a wire spiral reinforced rubber hose. BACKGROUND ART A wire spiral reinforced hose including a hose main body, which includes reinforcing layers with metal wires helically wound thereon, is excellent in high-pressure durability as disclosed, for example, in Patent Document 1, if the wire density, the wire number per unit area of the metal wires making up the reinforcing layers, is high. PRIOR ART DOCUMENT Patent Document Patent Document 1 JP 2017-106554 A In Patent Document 1, there is disclosed a wire spiral reinforced hose including reinforcing layers with metal wires helically wound thereon, in which the wire density is as high as 90% or higher and 100% or lower. If the wire density is high, the wire spiral reinforced hose is excellent in high-pressure durability, but is low in flexibility and is high in cost. For an application where high-pressure durability is not required so much, a wire spiral reinforced hose that is high in wire density is costly, and its low flexibility restricts handling and leads to awkwardness. There is accordingly an outstanding demand for wire spiral reinforced hoses that have a certain degree of pressure resistance, have flexibility, and are low in cost. A wire spiral reinforce hose that has a moderate pressure resistance, has flexibility, and is low in cost can therefore be realized by lowering the wire density, although its pressure resistance is reduced. SUMMARY OF THE INVENTION Underlying Problems to be Solved by the Invention A wire spiral reinforced hose is manufactured by drawing wire bundles, in each of which a predetermined number of metal wires adjoin side by side, from bobbins, and helically winding them. In the case of a wire spiral reinforced rubber hose including reinforcing layers with metal wire bundles helically wound on intermediate rubber layers, a reduction in wire density means an increase in the spacing between the wire bundles, thereby facilitating occurrence of a pinhole burst that a fluid of high pressure pierces through the enlarged spacing between the wire bundles and then sticks out in a needle form. Hence, the pressure (called a “pinhole BP”) at which a pinhole burst occurs decreases if the wire density is reduced. In a wire spiral reinforced rubber hose, the pressure (called “the hose main body BP”) at which a hose main body bursts also decreases generally if the wire density is reduced. The hose main body burst means that a plurality of metal wires are cut to cause a serious burst. If the spacing between the wire bundles increases by a reduction in wire density, the pinhole BP may become lower than the hose main body BP because the pinhole BP has a greater reduction rate than the hose main body BP. Then, a pinhole burst is caused to occur before the hose main body bursts. Even if the hose main body is in a condition that allows it to withstand a pressure, the occurrence of the pinhole burst makes the hose itself no longer usable. With the foregoing problems in view, the present invention has, as an object thereof, the provision of a low-cost, flexible wire spiral reinforced rubber hose, which does not cause occurrence of a pinhole burst before a hose main body bursts, by setting an appropriate wire density having a pressure resistance that is not high but moderate. Means to Solve the Problems To achieve the above-described object, the present invention provides a wire spiral reinforced rubber hose including a hose main body that includes reinforcing layers with metal wires helically wound thereon, in which the reinforcing layers are each formed by helically wound wire bundles in which a plurality of metal wires adjoin side by side, respectively, a wire density of the metal wires in the reinforcing layers is 40% or higher and 80% or lower, and a wire bundle spacing between the adjoining wire bundles is 1 mm or smaller. According to this configuration, the wire spiral reinforced rubber hose can be made low in cost while allowing the hose main body to have a pressure resistance which is not high but moderate and flexibility, as the wire density of the metal wires in the reinforcing layers is 40% or higher and 80% or lower, and owing to the setting at 1 mm or smaller, the wire bundle spacing between the adjoining wire bundles can also prevent the occurrence of a pinhole burst before the hose main body bursts. In other words, if the wire density is 80% or higher, the hose main body loses flexibility, and the wire spiral reinforced rubber hose requires a high cost. If the wire density is lower than 40%, the pinhole BP significantly decreases in particular, and a pinhole burst is prone to occur. In a preferred embodiment of the present invention, a wire diameter of the metal wires is 0.30 mm or greater and 0.80 mm or smaller. According to this configuration, the number of the metal wires that each make up wire bundles to be helically wound can be set to 2 to 6, which is appropriate for helically winding