Resin Composite Fuel Hose

Abstract

A resin composite fuel hose of a multilayer construction includes a resin layer as a barrier layer having a fuel permeation resistance, an inner rubber layer as an inner surface layer laminated on an inner side of the resin layer and an outer rubber layer laminated on an outer side of the resin layer. The outer rubber layer has a rubber hardness degree equal to or greater than that of the inner rubber layer, and the inner rubber layer has a permanent elongation equal to or less than 90%.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a resin composite fuel hose according to the present invention, shown partly broken away.

FIG. 2A is an overall sectional view of the resin composite fuel hose of FIG. 1.

FIG. 2B is an overall side view of the resin composite fuel hose of FIG. 1.

FIG. 3 is a perspective view of a modified resin composite fuel hose according to the present invention.

FIG. 4 is a perspective view of another modified resin composite fuel hose according to the present invention.

FIG. 5A is a sectional view of a conventional resin composite fuel hose.

FIG. 5B is an enlarged view of a part of the conventional resin composite fuel hose of FIG. 5A.

FIG. 6 is a view showing a typical production method for producing a conventional resin composite fuel hose of curved shape.

Claims

1. A resin composite fuel hose of a multilayer construction, comprising: a resin layer having permeation resistance to a fuel and serving as a barrier layer, an inner rubber layer as an inner surface layer laminated on an inner side of the resin layer and an outer rubber layer laminated on an outer side of the resin layer, wherein:the outer rubber layer has a rubber hardness degree equal to or greater than that of the inner rubber layer, and the inner rubber layer has a permanent elongation equal to or less than 90% according to JISK6262.

2. The resin composite fuel hose as set forth in claim 1, wherein the inner rubber layer has a rubber hardness degree in a range of 65 to 80 according to a durometer hardness test (type A) of JISK6253.

3. The resin composite fuel hose as set forth in claim 1, wherein the outer rubber layer has a rubber hardness degree in a range of 65 to 85 according to a durometer hardness test (type A) of JISK6253.