Fuel Hose

Abstract

A fuel hose has multilayered construction and a flexible corrugated portion with corrugation bottom portions and corrugation peak portions. The fuel hose includes a rubber layer and a resin layer that is a laminated on an inner side of the rubber layer. The resin layer has fuel permeation resistance and serves as a barrier layer. The corrugated portion satisfies a condition of H/W≧1.1 when H represents a height of the corrugation measured between an inside of the corrugation bottom portion and an inside of the corrugation peak portion thereof, and 2W represents an axial distance between an inside of the corrugation bottom portion and an inside of an adjacent corrugation bottom portion.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a view of a fuel hose according to one embodiment of the present invention.

FIG. 2A is an enlarged view of a part of a corrugated portion of the fuel hose of FIG. 1.

FIG. 2B is a view of a modified embodiment of the corrugated portion of the fuel hose of FIG. 1.

FIG. 3A is a schematic view showing flexibility and pliableness of the fuel hose of FIG. 2A when a load F is exerted to the corrugated portion thereof.

FIG. 3B is a schematic view showing flexibility and pliableness of the fuel hose of FIG. 2B when a load F is exerted to the corrugated portion thereof.

FIG. 4 is a view showing a method for measuring elongation and load by exerting an axial pull-force on a corrugated portion of a fuel hose.

Claims

1. A fuel hose having a multilayered construction and a flexible corrugated portion with corrugation bottom portions and corrugation peak portions for transporting a fuel from a fuel inlet to a fuel tank, the fuel hose, comprising: a rubber layer, anda resin layer that is laminated on an inner side of the rubber layer, the resin layer having fuel permeation resistance and serving as a barrier layer, wherein:the corrugated portion satisfies a condition of H/W≧1.1 when H represents a height of a corrugation measured between an inside of the corrugation bottom portion and an inside of the corrugation peak portion, and 2W represents an axial distance between an inside of the corrugation bottom portion and an inside of an adjacent corrugation bottom portion.

2. The fuel hose as set forth in claim 1, wherein said H represents a height of the corrugation measured between an inside of a lowest point of the corrugation bottom portion and an inside of a highest point of the corrugation peak portion.

3. The fuel hose as set forth in claim 1, wherein said 2W represents an axial distance of an inside opening of a part from the corrugation bottom portion to an adjacent corrugation bottom portion through the corrugation peak portion in the corrugated portion.

4. The fuel hose as set forth in claim 1, wherein said 2W represents an axial distance between an inside point of one corrugation bottom portion of a pair of adjacent corrugation bottom portions and an inside point of the other corrugation bottom portion thereof, the inside point of the one corrugation bottom portion is defined by an intersecting point of a tangent T in an axial direction to an inner surface of the one corrugation bottom portion and an extension line K extended from a slanted portion from the corrugation peak portion to the one corrugation bottom portion, and the inside point of the other corrugation bottom portion is defined by an intersecting point of a tangent T in an axial direction to an inner surface of the other corrugation bottom portion and an extension line K extended from a slanted portion from the corrugation peak portion to the other corrugation bottom portion.

5. The fuel hose as set forth in claim 1, wherein the corrugation peak portion has a flat portion extending straight in an axial direction.

6. The fuel hose as set forth in claim 5, wherein the corrugation bottom portion has a flat portion extending straight in an axial direction.

7. A fuel hose having a multilayered construction and a flexible corrugated portion with corrugation bottom portions and corrugation peak portions for transporting a fuel from a fuel inlet to a fuel tank, the fuel hose, comprising: a rubber layer, anda resin layer that is laminated on an inner side of the rubber layer, the resin layer having fuel permeation resistance and serving as a barrier layer, wherein:the corrugation peak portion and/or the corrugation bottom portion has a flat portion extending straight in an axial direction.