Vibration-reducing structure for fuel pipe

Abstract

A vibration-reducing structure for a fuel pipe includes a fuel hose, and a pulsation damper. Fuel is supplied to an engine installed in a vehicle through the fuel hose. The pulsation damper is disposed on the fuel hose at a predetermined position. The pulsation damper suppresses pulsations of fuel. The fuel hose is fixed to a vehicle body at the predetermined position.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The foregoing and further objects, features and advantages of the invention will become apparent from the following description of example embodiments with reference to the accompanying drawings, wherein like numerals are used to represent like elements and wherein:

FIG. 1 is a plan view showing the engine room of a vehicle to which the vibration-reducing structure for a fuel pipe according to an embodiment of the invention is applied;

FIG. 2 is a cross sectional view of the vehicle, taken along line 11-11 in FIG. 1;

FIG. 3 is a diagram showing the positions of pulsation dampers and a pressure sensor;

FIG. 4 is a graph showing the relation between the amounts of change in fuel pressure and frequencies in experiment;

FIG. 5 is a diagram showing the positions of the pulsation dampers and the pressure sensors in comparative experiment; and

FIG. 6 is a graph showing the relation between the amounts of change in fuel pressure and frequencies in the comparative experiment.

Claims

1. A vibration-reducing structure for a fuel pipe, comprising: a fuel pipe through which fuel is supplied to an internal combustion engine installed in a vehicle;a pulsation damper which is disposed on the fuel pipe at a predetermined position, and which suppresses pulsations of fuel, wherein the fuel pipe is fixed to a vehicle body at the predetermined position.

2. The vibration-reducing structure according to claim 1, wherein the fuel pipe is fixed to the vehicle body at a plurality of positions that includes the predetermined position; anda portion of the vehicle body, to which the fuel pipe is fixed at the predetermined position, has highest stiffness among all portions of the vehicle body, to which the fuel pipe is fixed at the plurality of positions.

3. The vibration-reducing structure according to claim 2, wherein the predetermined position matches a position of a loop of a standing wave when fuel pressure oscillates.

4. The vibration-reducing structure according to claim 1, wherein the predetermined position matches a position of a loop of a standing wave when fuel pressure oscillates.