JPH0217756B2 - - Google Patents

Description

[Detailed description of the invention]

TECHNICAL FIELD The present invention relates to a hose, and more particularly to a hose with an improved structure of a reinforcing layer. Among hoses having a reinforcing layer, in hoses in which the reinforcing layer is formed by spirally winding reinforcing threads, twisted yarn e has conventionally been used as the reinforcing thread, as shown in FIG. For this reason, widening the strand spacing of the reinforcing layer E will reduce the performance of the hose at high temperatures.In order to solve this problem, increasing the strand spacing will increase the amount of yarn, resulting in high costs. Since the hose is approximately circular in shape, it has disadvantages such as an increase in the outer diameter of the hose, as shown in FIG. Furthermore, since the twisted yarn e has a substantially circular cross-sectional shape as described above, the contact area with the inner tube rubber layer is small, and when unvulcanized rubber is used as the inner tube rubber layer when manufacturing a hose, In the process of wrapping the twisted yarn e around this, it bites into the inner tube rubber layer,
The current problem is that the durability of the hose is greatly reduced. The present inventors have arrived at the present invention as a result of intensive studies aimed at solving the problems of the prior art as described above. Therefore, an object of the present invention is to improve the reinforcing thread of a hose that has a reinforcing layer by spirally winding reinforcing thread to form a reinforcing layer, thereby reducing the amount of reinforcing thread compared to conventional hoses. It is an object of the present invention to provide a hose that can obtain good performance at high temperatures, can reduce the outer diameter of the hose with the same amount of reinforcing yarn as a conventional hose, and has excellent durability. That is, the present invention provides a hose in which at least two reinforcing layers are provided on the outside of an inner tube rubber layer via an interlayer rubber layer, and the reinforcing layer is formed by winding untwisted yarn having a flat cross section in a spiral shape. The gist of the present invention is to provide a hose characterized in that the spiral winding directions of the non-twisted yarn are opposite to each other between adjacent reinforcing layers. Hereinafter, the present invention will be specifically described by way of examples with reference to the drawings. FIG. 3 is a perspective sectional view showing the structure of a hose according to an embodiment of the present invention, and FIG. 4 is a sectional view taken along arrows in FIG. 3. In the figure, F is a hose according to an embodiment of the present invention, in which untwisted yarn a made of synthetic fibers such as polyester or polyamide is wound in a spiral around the outside of an inner tube rubber layer 1 made of an oil-resistant rubber material. to form a first reinforcing layer 2, and on the outside of this first reinforcing layer 2, a thin interlayer rubber layer 3 is interposed, and the untwisted yarn a is spirally formed in the opposite direction to the first reinforcing layer 2. The second reinforcing layer 4 is formed by winding the reinforcing layer 4, and an outer rubber layer 5 made of a rubber material having weather resistance and abrasion resistance is provided on the outside of the second reinforcing layer 4. In this example, two reinforcing layers, the first reinforcing layer and the second reinforcing layer, were applied as described above.
Of course, three or more layers may be applied depending on the purpose of the hose or the like. However, in any case, it is preferable that the reinforcing yarns constituting the reinforcing layer, that is, the non-twisted yarns a, be wound in a direction opposite to the direction in which the non-twisted yarns a of the adjacent reinforcing layer are wound. This is because the untwisted yarn winding direction of each reinforcing layer is all in the same direction.
This is because the hose is given directionality, which is not practical. The at least two reinforcing layers 2 and 4 arranged with the interlayer rubber layer 3 interposed therebetween are required to have non-twisted yarns a having a flat cross section wound in a spiral shape. Since the non-twisted yarn a is used as the reinforcing material, the non-twisted yarn a can be easily flattened, and as a result, the cross-sectional shape of the reinforcing layers 2 and 4 can be made thin as shown in FIG. I can,
And the untwisted yarn a is placed on the surface of the inner tube rubber layer 1 without any gaps.
And it can be coated flatly. Therefore, the physical properties of the reinforcing layer can be made uniform, and it is also possible to prevent the untwisted yarn a from being bitten into the inner tube rubber layer 1 during the production of the hose. Furthermore, if the amount of yarn is the same, a thin reinforcing layer can reduce the outer diameter and weight of the hose, and reduce its cost. Next, the effects of the present invention will be explained with reference to Examples. Experimental Example First, a hose F of the present invention was manufactured as follows. Made of highly oil-resistant NBR rubber with a wall thickness of 1.7 mm.
mm, on the outside of the inner tube rubber layer 1 with an inner diameter of 10.0 mm,
The first reinforcing layer 2 is formed by winding a 1500d/1 non-twisted polyester yarn a in a spiral shape at an angle approximating 54°45' to the hose axis so that the surface is flat. On the outside of the reinforcing layer 2, there is a thick wall made of NBR rubber material as an adhesive layer.
An interlayer rubber layer 3 of 0.1 to 0.2 mm is provided, and a 1500d/1 non-twisted polyester yarn a is placed on the outside of this interlayer rubber layer 3, opposite to the direction of winding the non-twisted yarn of the first reinforcing layer 1 with respect to the hose axis. The second reinforcing layer 4 is formed by winding the second reinforcing layer 4 in a spiral shape at an angle approximating 54°45′ in the direction, and the outer side of the second reinforcing layer 4 is coated with weatherproof and resistant material. It was covered with an outer rubber layer 5 made of a CR-based rubber material that is highly abrasive. Next, as a comparative example hose E, a hose having the same structure as the above-described present invention hose F was produced, except that 100d/3 polyester twist e was used as the first reinforcing layer 2 and the second reinforcing layer 4. . Performance tests were conducted on the above-mentioned invention hose F and comparative example hose E, and the test results shown in Table 1 were obtained.

[Table] From Table 1, in the destructive test at room temperature, both the present invention hose F and the comparative example hose E had the same results, but in the destructive test at a high temperature of 120°C, it was clear that the present invention hose F had the same results as the comparative example. It can be seen that good results are obtained when compared with Example Hose E. According to the present invention, since the reinforcing layer disposed outside the inner tube rubber layer is made of untwisted yarn having a flat cross section, the reinforcing layer can be dense and flat. Therefore, the outer diameter of the hose can be made smaller, preventing a decrease in durability due to threads biting into the inner tube rubber layer, and preventing troubles caused by a decrease in the modulus of the inner tube rubber layer at high temperatures. Can be done. Furthermore, there is the advantage that the weight and cost of the hose can be reduced.

[Brief explanation of drawings]

Figures 1 and 2 show a conventional hose. Figure 1 is a perspective view explaining the structure of the hose, Figure 2 is a cross-sectional view taken from Figure 1 - arrows, and Figures 3 and 4.
The figure shows a hose according to an embodiment of the invention;
The figure is a perspective view illustrating the structure of the hose, and FIG. 4 is a sectional view taken along arrows in FIG. 3. 1... Inner tube rubber layer, a... Non-twisted yarn, 2... First
3... Interlayer rubber layer, 4... Second reinforcing layer, 5... External rubber layer.

Claims (1)

[Claims] 1. A hose in which at least two reinforcing layers are provided on the outside of the inner tube rubber layer with an interlayer rubber layer interposed therebetween,
The reinforcing layer is formed by winding non-twisted yarn having a flat cross section in a spiral shape, and the directions of spiral winding of the non-twisted yarn are opposite to each other between adjacent reinforcing layers.