CN101260854B

CN101260854B - Fuel delivery pipe

Info

Publication number: CN101260854B
Application number: CN2008100926546A
Authority: CN
Inventors: 臼井正佳; 渡边荣司; 土屋光; 芹泽由之; 水野贺寿光; 林耕一; 小方哲夫
Original assignee: Usui Kokusai Sangyo Kaisha Ltd
Current assignee: Usui Kokusai Sangyo Kaisha Ltd
Priority date: 2002-10-11
Filing date: 2003-10-08
Publication date: 2011-01-26
Anticipated expiration: 2023-10-08
Also published as: CN1692222A; CN100420847C; CN101260854A

Abstract

A fuel delivery pipe capable of reducing a pressure pulsation at the time of a fuel injection due to injection nozzles, preventing vibrations and noises at an underfloor pipe arrangement, and turning down a radiate sound from the fuel delivery pipe, wherein a flexible absorbing wall surface (10) formed on a wall surface of a fuel delivery body (1) is loosened due to internal pressure changes to render internal volume of the fuel delivery body (1) increasable, alphaL/{square root}{square root over (V determined by sonic speed alphaL of fuel flowing through the fuel delivery body 1 and the internal volume V of the fuel delivery body 1 is set as 20*10<3>(m<-0.5>.sec<-1>)<=alphaL/{square root}{square root over (V<=85*10<3>(m<-0.5>.sec<-1>) while a ratio alphaL/alphaH of equivalent sonic speedalphaH in a high frequency area to the sonic speed alphaL of the fuel is set as alphaL/alphaH<=0.7.

Description

Fuel-supply pipe

The present invention is that application number is 200380100304.5 (PCT/JP2003/012889), the applying date to be on October 8th, 2003, and denomination of invention is divided an application for the Chinese invention patent application of " fuel-supply pipe ".

Technical field

The present invention relates to fuel injector (jet nozzles) by direct injection, the fuel supply of carrying from the fuel compression pump of electronic fuel-injection system formula engine for automobile to each inlet air pathway of motor or the fuel-supply pipe in the cylinder, is sprayed pressure pulsation and the radiation noise that produces to reduce fuel.And, also relate to cross-sectional configuration and the external structure of fuel-supply pipe or the pressure pulsation and the reduction mechanism (mechanical device) of radiating noise of fuel-supply pipe of the fuel-supply pipe of carrying fuel path.

Background technique

Technique known was in the past, and a plurality of jet nozzless are set, with the fuel-supply pipe of a plurality of cylinders of fuel supply motors such as gasoline.This fuel-supply pipe is ejected into the fuel that is imported by fuel tank in a plurality of suction tude or cylinder of motor in turn from a plurality of jet nozzless, makes fuel and air mixing, by allowing the gaseous combustion of this mixing, the output that produces motor.

This fuel-supply pipe such as above-mentioned, though pipe arrangement is ejected into the fuel of being supplied with by fuel tank in the suction tude or cylinder of motor from jet nozzles below base plate, but, the fuel-supply pipe that following form is also arranged, promptly under the situation that the fuel of being supplied with is supplied with in fuel-supply pipe too much, be provided with by pressure regulator this unnecessary fuel is turned back to the loop in the fuel tank mode, return the type fuel-supply pipe.In addition, also have with this return the type fuel-supply pipe different, the nothing that the fuel of supplying with is turned back to the loop in the fuel tank be not set return the type fuel-supply pipe.

The unnecessary fuel of fueling delivery pipe is turned back to the fuel-supply pipe of the mode in the fuel tank, because the amount that can remain fuel in the fuel-supply pipe so its advantage is, along with the injection of fuel, is difficult to produce pressure pulsation for certain.But the fuel meeting high temperatureization that near the fuel-supply pipe that disposes the high-temperature engine cylinder is supplied with owing to this unnecessary fuel by high temperatureization can turn back in the fuel tank, therefore, can cause the gasoline temperature in the fuel tank to rise.Because the rising of this temperature causes fuel evaporation, can produce ill effect to environment, in view of this defective, the nothing that people have proposed these unnecessary fuel not to be returned fuel tank is returned the type fuel-supply pipe.

This nothing is returned the type fuel-supply pipe, from jet nozzles under the situation that suction tude or cylinder spray, owing to be provided with unnecessary fuel is not turned back to pipe arrangement in the fuel tank, so, when the fuel pressure change in the fuel-supply pipe becomes big, will produce big pressure wave, compare, also can produce bigger pressure pulsation with the type fuel-supply pipe of returning.

The present invention uses the nothing be easy to produce pressure pulsation to return the type fuel-supply pipe.Therefore, about conventional art, by means of from the injection of jet nozzles to the fuel of engine air inlet tube or cylinder, during to the inner pressure relief of fuel-supply pipe, in case carry out this rapid decompression, pressure wave because of stopping of spraying of fuel produced will cause producing pressure pulsation in the inside of fuel-supply pipe.This pressure pulsation propagates into the fuel tank rear flank from fuel-supply pipe and the connecting tube that is connected with this fuel-supply pipe, and the pressure-regulating valve in the fuel tank reverses and returns, by propagating into fuel-supply pipe behind the connecting tube.In fuel-supply pipe, be provided with a plurality of jet nozzless, these a plurality of jet nozzless carry out the injection of fuel in turn, produce pressure pulsation.

As a result, this pressure pulsation is fixed on clip below the base plate by pipe arrangement below base plate, is propagated as noise in car, and this noise bring unplessantness displeasure can for driver or motroist.

In the past, method as the drawback that suppresses this pressure pulsation generation, the pulsation damper of diaphragm of rubber of will packing into is configured in not have and returns on the type fuel-supply pipe, absorb the pressure pulsation energy that is produced by this pulsation damper, simultaneously, pipe arrangement is fixed on below the base plate with clip by shock absorption below the base plate that is set below will the base plate from fuel-supply pipe to the fuel tank side, whereby, absorbs fuel-supply pipe or pipe arrangement produced below the base plate of fuel tank vibration.This method is more effective, can suppress the drawback that generation brought of pressure pulsation effectively.

Yet the clip that pulsation damper and shock absorption are used costs an arm and a leg, and when increasing number of parts, has also raised expense, in order to ensure the space is set, also produces some new problems.Therefore, having proposed the clip that does not use this pulsation damper and shock absorption to use, is purpose to reduce pressure pulsation, has the scheme of the pulsation absorption function of the pressure pulsation that can absorb fuel-supply pipe.

This fuel-supply pipe with pressure pulsation absorption function, known has, the spy opens the invention of 2000-329030 communique record, the spy opens the invention of 2000-320422 communique record, the spy opens the invention of 2000-329031 communique record, the invention of Te Kaiping 11-37380 communique record, the spy opens the invention of flat 11-2164 communique record etc.Wherein, fuel-supply pipe with pressure pulsation absorption function, on the outer wall of fuel-supply pipe, be formed with flexible absorption surface, this flexible absorption surface bears the pressure that injection produced along with fuel, and generation bending deflection, whereby, absorb and also to reduce pressure pulsation, can prevent the generation of the noise that the vibration of fuel-supply pipe, miscellaneous part brings.

But, in above-mentioned conventional art, though the assimilation effect of pressure pulsation exists really, but, the switching of the jet nozzles when spraying along with fuel is produced the guiding valve of jet nozzles when being seated at valve seat etc. click is eaten the sound that click is eaten the high frequency zone more than several kHz of sound etc., brought into play the effect of loudspeaker because of absorption surface, negative effect occurred to the outside radiation.

In addition, the present inventor opens in 2000-329030 number " fuel-supply pipe " above-mentioned spy, proposed with fuel carry the outer wall of body make flexible absorption surface, to absorb the scheme of pulsation.Figure 46 be with the fuel of fuel-supply pipe carry the box section integral body of body 81 make the pliability absorption surface, to absorb the example of pulsation.On the bottom surface of fuel conveying body 81, be fixed with a plurality of bases 82, fuel from the fuel inflow entrance 84 of fuel passage 83 by base 82, is supplied with in the jet nozzles (not shown).Fuel carry the size in length and breadth of body 81 for example can set for thickness of slab is the carbon steel parts of 1.2mm, height H is 32mm, width W is the degree of 20mm.

Present inventor etc., suppose under the situation of 10 atmospheric pressure of effect in this fuel is carried body 81, and fuel is being carried the fixing of body 81 be fixed under the condition of bottom surface with carriage (with reference to Fig. 1) and base 82, carrying out FEM (limited salt matrices) resolves, when calculating the internal capacity increment rate, the changing condition of the section configuration of enlargement deformation amount is illustrated among Figure 47.

As shown in figure 47, owing to bear internal pressure, fuel carries the left side wall 85 and the right side wall 86 of body 81 internal faces to expand to the transverse bending shown in the solid line from dotted line, but, 88 difference of top wall 87 wherein and lower part wall are crooked to the inside shrinks, and the result shows that the degree of the increment rate limit of internal capacity is about 0.55%.

Secondly, the axial vertical section shape that fuel is carried body 81 is varied to the trapezoidal shape of mortar shape described later, drum shape, flask shape, handstand flask shape, trapezoidal shape, handstand (with reference to Fig. 1, Fig. 2, Fig. 4～Figure 30, Figure 37～Figure 42) etc. from box section, carry out same parsing, the result shows that it is 1.1～1.8% that the increment rate of internal capacity increases to.Its reason should be considered following factor: in such shape, about from becoming the result of curved surface at first, the effect of being under pressure of these curved surfaces, towards the direction distortion that its curvature reduces, the result, left and right directions absorbs deflection, top and bottom are out of shape hardly, and the increase quantitative change of internal capacity is big.

Though it is can computed numeric value analysis that FEM resolves, owing to be when will using reproduction result of experiment in kind to feed back, append correction all the time, therefore, also can greatly improve its reliability.

In addition, open in clear 60-240867 number " the fuel supply conduit of fuel-injection device for internal combustion engine " the spy, disclosed and carried at least 1 of wall of body flexibly to constitute fuel, and section is roughly leg-of-mutton fuel and carries body so that make the structure of fuel pulsation decay.Yet, even invention so in the past, though can obtain the attenuating of pressure pulsation,, but can not obtain the effect that the noise in high frequency zone reduces.

Summary of the invention

The present invention proposes in order to address the above problem, pressure pulsation in the time of can reducing the combustion jet that causes because of jet nozzles, prevent the vibration of pipe arrangement below the base plate or the generation of noise, simultaneously, can obtain to reduce the fuel-supply pipe of carrying the radiation sound of body from fuel.In addition, need not use pulsation damper or shock absorption with high price such as clip parts, just can produce pressure pulsation or radiate the reduction obvious results goods of sound, can reduce manufacture cost.In addition, need not increase outside dimension and just can form such fuel conveying body, can also be arranged in the engine compartment limited space such as interior.And, also provide a kind of and can bring into play such pressure pulsation attenuating, reduce the radiation sound, do not increase the structure of the fuel-supply pipe of outside dimension.

The present invention is in order to address the above problem, its the 1st invention is, a kind of fuel-supply pipe is provided, it returns type fuel to the nothing in the loop that fuel tank returns and carries on the body and be connected with the fuel ingress pipe having jet nozzles and be not provided with, this fuel ingress pipe pipe arrangement below base plate is connected with fuel tank, wherein, above-mentioned fuel carries the section configuration of the axle Vertical direction of body to be roughly rectangle, and with 2 the long side walls roughly mortar shape section of the crooked shape that forms formation to the inside respectively with this essentially rectangular, on either party of 2 smooth short brink walls or 2 long side walls, be fixed with each base that jet nozzles connects usefulness, above-mentioned 2 long side walls constitute flexible absorption wall, this absorption wall bears the pressure that is produced along with the fuel injection and is out of shape, whereby, absorb pulsation.

In addition, also can be near the central authorities of above-mentioned 2 long side walls, to form flat respectively.

And, the 2nd invention is, a kind of fuel-supply pipe is provided, it returns type fuel to the nothing in the loop that fuel tank returns and carries on the body and be connected with the fuel ingress pipe having jet nozzles and be not provided with, this fuel ingress pipe pipe arrangement below base plate is connected with fuel tank, wherein, above-mentioned fuel carries the section configuration of the axle Vertical direction of body to be provided with the section formation that is roughly flask that rectangle roughly forms with trapezoidal top margin, the bottom surface of this flask section roughly or above or be fixed with each base that jet nozzles connects usefulness on any one of 2 sides, 2 sides that are roughly the flask section constitute flexible absorption wall, this absorption wall bears the pressure that is produced along with the fuel injection and is out of shape, whereby, absorb pulsation.

Also have, the 3rd invention is, a kind of fuel-supply pipe is provided, it returns type fuel to the nothing in the loop that fuel tank returns and carries on the body and be connected with the fuel ingress pipe having jet nozzles and be not provided with, this fuel ingress pipe pipe arrangement below base plate is connected with fuel tank, wherein, it is that trapezoidal top margin is provided with the roughly flask shape that essentially rectangular forms that above-mentioned fuel is carried the section configuration of the axle Vertical direction of body, and the roughly flask section that pushes up by the arch of the shape that arc-shaped bend was become with the top that has essentially rectangular forms, roughly be fixed with each base that jet nozzles connects usefulness on any one of the bottom surface of flask section or 2 sides at this, this roughly constitutes flexible absorption wall in 2 sides of flask section, this absorption wall bears the pressure that is produced along with the fuel injection and is out of shape, whereby, absorb pulsation.

In addition, the 4th invention is, a kind of fuel-supply pipe is provided, it returns type fuel to the nothing in the loop that fuel tank returns and carries on the body and be connected with the fuel ingress pipe having jet nozzles and be not provided with, this fuel ingress pipe pipe arrangement below base plate is connected with fuel tank, wherein, above-mentioned fuel is carried the section configuration of the axle Vertical direction of body to be provided with the trapezoidal handstand flask section that is become that stands upside down with the top margin at essentially rectangular and is formed, on the bottom surface of this handstand flask section, be fixed with each base that jet nozzles connects usefulness, 2 sides of handstand flask section constitute flexible absorption wall, this absorption wall bears the pressure that is produced along with the fuel injection and is out of shape, whereby, absorb pulsation.

Moreover, the 5th invention is, a kind of fuel-supply pipe is provided, it returns type fuel to the nothing in the loop that fuel tank returns and carries on the body and be connected with the fuel ingress pipe having jet nozzles and be not provided with, this fuel ingress pipe pipe arrangement below base plate is connected with fuel tank, wherein, the section configuration of the axle Vertical direction of above-mentioned fuel conveying body is with roughly trapezoidal cross-section formation, this is 2 hypotenuses bending to the inside respectively of trapezoidal cross-section roughly, this roughly trapezoidal cross-section the bottom surface or above or be fixed with each base that jet nozzles connects usefulness on any one of 2 hypotenuses, roughly 2 of trapezoidal cross-section hypotenuses constitute flexible absorption wall, this absorption wall bears the pressure that is produced along with the fuel injection and is out of shape, whereby, absorb pulsation.

Also have, the 6th invention is, a kind of fuel-supply pipe is provided, it returns type fuel to the nothing in the loop that fuel tank returns and carries on the body and be connected with the fuel ingress pipe having jet nozzles and be not provided with, this fuel ingress pipe pipe arrangement below base plate is connected with fuel tank, wherein, it is trapezoidal shape roughly that above-mentioned fuel is carried the section configuration of the axle Vertical direction of body, and to have of the roughly trapezoidal cross-section formation of trapezoidal top according to the arch top of the shape that arc-shaped bend was become, this is 2 hypotenuses bending to the inside respectively of trapezoidal cross-section roughly, roughly be fixed with each base that jet nozzles connects usefulness on any one of the bottom surface of trapezoidal cross-section or 2 hypotenuses at this, roughly 2 of trapezoidal cross-section hypotenuses constitute flexible absorption wall, this absorption wall bears the pressure that is produced along with the fuel injection and is out of shape, and whereby, absorbs pulsation.

In addition, the 7th invention is, a kind of fuel-supply pipe is provided, it returns type fuel to the nothing in the loop that fuel tank returns and carries on the body and be connected with the fuel ingress pipe having jet nozzles and be not provided with, this fuel ingress pipe pipe arrangement below base plate is connected with fuel tank, wherein, above-mentioned fuel carries the section configuration of the axle Vertical direction of body to form with the handstand trapezoidal cross-section, 2 hypotenuses of this handstand trapezoidal cross-section are crooked to the inside respectively, on the bottom surface of this handstand trapezoidal cross-section, be fixed with each base that jet nozzles connects usefulness, 2 hypotenuses of handstand trapezoidal cross-section constitute flexible absorption wall, this absorption wall bears the pressure that is produced along with the fuel injection and is out of shape, whereby, absorb pulsation.

Moreover, the 8th invention is, provide in a kind of fuel-supply pipe, it returns type fuel to the nothing in the loop that fuel tank returns and carries on the body and be connected with the fuel ingress pipe having jet nozzles and be not provided with, this fuel ingress pipe pipe arrangement below base plate is connected with fuel tank, wherein, it is that top margin with essentially rectangular is provided with the roughly key shaped section formation that the width essentially rectangular narrower than the width of this rectangle forms that above-mentioned fuel is carried the section configuration of the axle Vertical direction of body, this roughly the key shaped section the bottom surface or above or be fixed with each base that jet nozzles connects usefulness on any one of 2 sides, roughly 2 of the key shaped section sides constitute flexible absorption wall, this absorption wall bears the pressure that is produced along with the fuel injection and is out of shape, whereby, absorb pulsation.

Moreover, the 9th invention is, a kind of fuel-supply pipe is provided, it returns type fuel to the nothing in the loop that fuel tank returns and carries on the body and be connected with the fuel ingress pipe having jet nozzles and be not provided with, this fuel ingress pipe pipe arrangement below base plate is connected with fuel tank, wherein, the section configuration of the axle Vertical direction of above-mentioned fuel conveying body is that the top margin of essentially rectangular is provided with the roughly key shaped shape that essentially rectangular became that width is narrower than this rectangle, and with have width narrow the essentially rectangular top form by the roughly key shaped section on the arch of the shape that arc-shaped bend was become top, roughly be fixed with each base that jet nozzles connects usefulness on any one of the bottom surface of key shaped section or 2 sides at this, roughly 2 of the key shaped section sides constitute flexible absorption wall, this absorption wall bears the pressure that is produced along with the fuel injection and is out of shape, whereby, absorb pulsation.

Also have, the 10th invention is, a kind of fuel-supply pipe is provided, it returns type fuel to the nothing in the loop that fuel tank returns and carries on the body and be connected with the fuel ingress pipe having jet nozzles and be not provided with, this fuel ingress pipe pipe arrangement below base plate is connected with fuel tank, wherein, it is essentially rectangular that above-mentioned fuel is carried the section configuration of the axle Vertical direction of body, and form to allow any one substantial middle portion of 2 long side walls of this essentially rectangular bend to the roughly goggles shape section that the groove shape become to the inside, on either party of the long side wall of another general planar or 2 smooth short brink walls, be fixed with each base that jet nozzles connects usefulness, at least the long side wall that above-mentioned substantial middle portion bends to the groove shape constitutes flexible absorption wall, this absorption wall bears the pressure that is produced along with the fuel injection and is out of shape, whereby, absorb pulsation.

In addition, also can make 2 long side walls parallel.

Moreover, also can make one of 2 long side walls to form highlightedly towards foreign side.

Also have, also can make fuel carry 4 angles of the section configuration of body to have 1 at least for circular-arc.

In addition, the 11st invention is, a kind of fuel-supply pipe is provided, this fuel-supply pipe returns type fuel to the nothing in the loop that fuel tank returns and carries on the body and be connected with the fuel ingress pipe having not being provided with of jet nozzles, this fuel ingress pipe pipe arrangement below base plate is connected with fuel tank, wherein, on the wall of fuel conveying body, be formed with flexible absorption wall, variation by means of internal pressure, the deflection of flexible absorption wall thus, can increase the internal capacity that fuel is carried body, simultaneously, fuel is carried the velocity of sound α of the fuel that flows in the body _LCarry the internal capacity V of body to be determined with fuel

For:

Above-mentioned fuel velocity of sound α _LWith the velocity of sound α of equal value that carries the high frequency zone of the fuel that flows in the body by fuel _HRatio α _L/ α _HFor: α _L/ α _H≤ 0.7.

In addition, can also be, For:

Moreover, can also be,

For:

α _L/ α _HBe: 0.35≤α _L/ α _H≤ 0.7.

Can also be, flexible absorption wall be carried inwardly square crooked formation of at least a portion of body wall by making fuel, and by means of the variation of internal pressure, curved section whereby, increases the internal capacity that fuel is carried body to foreign side's deflection.

The present invention is owing to have said structure, in as the described fuel-supply pipe of the 1st～the 10th invention, can increase the rate of volumetric change when being subjected to pressure same significantly, improve the pulsation assimilation effect of flexible absorption wall, can suppress to radiate the transmission of the abnormal sound of sound etc. and propagate radiation.Because fuel carries the boundary dimension of body not have substantially to increase, so, even replace, also can be received in the space limited in the engine compartment with existing fuel-supply pipe, guarantee interchangeability as parts.

Rationale as the pulsation absorption of adsorbing wall, be appreciated that: the shock wave that is produced during the switching of jet nozzles, when flowing into to the fuel inflow entrance of base or flowing out because of the adverse current of moment, the deflection by flexible absorption wall absorbs to be impacted or pulsation; And the thin wall component smaller by means of spring constant produces deflection deformation, causes that internal capacity changes, and absorbs the pressure oscillation of fuel.

The the 1st～the 10th invention by adopting following various section configuration, can be brought into play same action effect.

(1) fuel carries the section configuration of the axle Vertical direction of body to be roughly rectangle, and is 2 the long side walls roughly mortar shape section of the shape that forms of bending to the inside respectively that makes this essentially rectangular.

(2) be near the roughly cydariform section that the central authorities of 2 long side walls of mortar shape section, forms flat respectively.

(3) section configuration of the axle Vertical direction of fuel conveying body is to be provided with the roughly flask section that essentially rectangular becomes at trapezoidal top margin.

(4) section configuration of the axle Vertical direction of fuel conveying body is to be provided with the roughly flask shape that essentially rectangular becomes at trapezoidal top margin, and is to have the roughly flask shape section of the top of essentially rectangular by the arch top of the shape that arc-shaped bend became.

(5) to carry the section configuration of the axle Vertical direction of body be that top margin at essentially rectangular is provided with the roughly trapezoidal handstand flask section that becomes to fuel.

(6) section configuration of the axle Vertical direction of fuel conveying body is a trapezoidal cross-section roughly.

(7) section configuration of the axle Vertical direction of fuel conveying body is a trapezoidal shape roughly, and is to allow the roughly trapezoidal cross-section of trapezoidal top by the arch top of the shape that arc-shaped bend was become.

(8) to carry the section configuration of the axle Vertical direction of body be the trapezoidal shape that stands upside down to fuel, and be 2 hypotenuses handstand trapezoidal cross-sections of the shape that become of bending to the inside respectively.

(9) to carry the section configuration of the axle Vertical direction of body be that top margin at essentially rectangular is provided with width the roughly key shaped section that essentially rectangular became narrower than the width of rectangle to fuel.

(10) section configuration of the axle Vertical direction of fuel conveying body is a key shape roughly, and is to have the roughly key shaped section of the top of the narrower essentially rectangular of width according to the arch top of the shape that arc-shaped bend became.

(11) to carry the section configuration of the axle Vertical direction of body be roughly rectangle to fuel, and be to allow the roughly goggles shape section of the shape that any one substantial middle portion of 2 long side walls of this essentially rectangular become with the groove sigmoid to the inside.

Also have, each section configuration does not need strictly to make the bilateral symmetry shape.In addition, be connected to fuel and carry base on the body can also be configured in top, the bottom surface of wall and the arbitrary position of 2 sides, the wall that connects this base is towards the below, so that configuration fuel carries body to be used.

In addition, the material that is used to form each section can be:

(A) form the weldless tube (except the seam when still, circular pipe is made) of processing by circular pipe;

(B) 2 channel-section steels are overlapped and with the pipe of seam welding;

(C) make a part of pipe that overlaps etc. by pressure processing;

The fuel that uses known processing method formation to have above-mentioned given section configuration is carried body.

In the 1st～10 invention, the material of the outside wall portions of fuel conveying body or the thickness of slab aspect rate component parts of absorption wall or intensity etc. can or be resolved according to experiment and be determined, particularly when the race of engine, should make to vibrate with pulsation becomes minimum value.

According to the fuel-supply pipe of the 1st～10 invention, keep the installation dimension of carriage, can keep the interchangeability of fuel-supply pipe relatively in the past.

In addition, the 11st invention relates to the reduction of pressure pulsation and mechanism's (device) that the radiation sound reduces, so, along with fuel when the injection of jet nozzles produces pressure pulsation, the interior mobile fuel velocity of sound α of its pressure oscillation value and fuel-supply pipe _LAnd fuel carries the internal capacity of body closely related, and its pass is the represented proportion expression of following formula 1:

[formula 1]

p &Proportional; \frac{α_{L}}{\sqrt{V}}

P: pressure oscillation value, α _L: fuel is carried the fuel velocity of sound in the body, and V fuel is carried the internal capacity of body.

Thereby, carry the fuel velocity of sound α that flows in the body by dwindling through fuel _L, can reduce pressure pulsation P.About this fuel velocity of sound α _L,, have following formula 2 to set up by means of amount of exercise rule and the continous way in the fuel.And, have following formula 3 to set up according to the definition of volumetric modulus of elasticity.

[formula 2]

α_{L} = \sqrt{\frac{\frac{1}{ρ}}{\frac{1}{K_{f}} + \frac{1}{K_{r}}}}

ρ: the density of fuel, K _f: the volumetric modulus of elasticity of fuel, K _r: fuel is carried intrinsic volumetric modulus of elasticity.

[formula 3]

K_{r} = \frac{ΔP}{\frac{ΔV}{V}}

Δ P: fuel carries intrinsic internal pressure to change Δ V: the fuel during additional internal pressure carries in the body/elasticity of bulk amount.

Utilize above-mentioned formula,, can obtain the fuel velocity of sound α that carries bulk flow through fuel by the numeric value analysis of FEM etc. _LAnd, at this fuel velocity of sound α _LUnder the situation about diminishing, if dwindle K _rBe that fuel carries intrinsic volumetric modulus of elasticity also to be fine, at this K _rWhen diminishing, the fuel in the time of can also increasing additional internal pressure is carried intrinsic internal capacity.Therefore, fuel-supply pipe of the present invention, owing to be formed with flexible absorption wall, by means of the variation of internal pressure, make the absorption wall to foreign side's deflection, whereby, can increase internal capacity, so, can improve the assimilation effect of pressure pulsation, can suppress the pulsation of below base plate pipe arrangement etc. or the transmission of noise and propagate.

On the other hand, carry intrinsic gas column vibrational mode and frequency thereof by obtaining fuel, the card that the guiding valve that can calculate jet nozzles produces when being seated at valve seat is eaten the velocity of sound α of equal value that card is eaten the high frequency zone more than severals kHz that sound and other radiation vocal cores come problem _HThat is, the gas column vibrational mode, the gas column condition of suitable closed at both ends end, the relation of following formula 4 is set up.

[formula 4]

f = \frac{{nα}_{H}}{2 l}

F: frequency, n: the number of times of gas column vibrational mode, l: fuel is carried the gas column length of body

From above-mentioned formula 4, and, can obtain the velocity of sound α of equal value in high frequency zone by means of following formula 5 _H

[formula 5]

α_{H} = \frac{2 fl}{n}

According to above-mentioned formula, calculate the velocity of sound α of equal value in the high frequency zone of fuel-supply pipe in the past _HSituation under, with above-mentioned fuel velocity of sound α _LSituation roughly the same, reduce α in order to reduce pressure pulsation _LThe time, α _HAlso can diminish, make the radiation change of tune big, this is inappropriate.But fuel-supply pipe of the present invention because the radiation vocal cores comes the pulsation in the high frequency zone of problem to make the absorption wall become the model shape that maintains a plurality of antinodes and node, is to be difficult to crooked shape, so the deflection of the absorption wall in high frequency zone diminishes.Therefore, even at fuel velocity of sound α _LUnder the situation about diminishing, the velocity of sound α of equal value in high frequency zone _HCan not diminish yet, can suppress the generation of big radiation sound well.

And, owing to form by following structure, that is, and the velocity of sound α of numeric value analysis that is undertaken by present inventor's grade and test result, fuel _LCarry the internal capacity V of body determined with fuel

For:

20 \times 10^{3} (m^{- 0.5} \cdot \sec^{- 1}) \leq α_{L} / \sqrt{V} \leq 85 \times 10^{3} (m^{- 0.5} \cdot \sec^{- 1}),

And the velocity of sound α of equal value in high frequency zone _HVelocity of sound α with fuel _LRatio α _L/ α _HFor: α _L/ α _H≤ 0.7, so, the fuel-supply pipe of the double effects that prevents effect of the assimilation effect of the pressure pulsation that can be improved and radiation sound.

For above-mentioned scope, suppose

α_{L} / \sqrt{V} < 20 \times 10^{3} (m^{- 0.5} \cdot \sec^{- 1}),

Just be necessary to dwindle α _LPerhaps increase V.In order to dwindle α _L, just must increase the internal capacity V that fuel is carried body, for this reason, must make the wall thickness reduction of wall, but reduced the durability of the pulsation when fuel carries the relative fuel of body to spray.In addition, in order to increase internal capacity V, must increase formation width, height and the length that fuel is carried body, excessive as internal capacity V, when becoming large volume, can cause the layout reduction on car body.On the contrary, if

α_{L} / \sqrt{V} > 85 \times 10^{3} (m^{- 0.5} \cdot \sec^{- 1}),

Then the increase of the internal capacity V that produces of internal pressure reduces than regular meeting, becomes the low parts of pulsation absorptivity, makes that pipe arrangement produces vibration below the base plate.

In addition, work as α _L/ α _H＞0.7 o'clock, in order to dwindle the velocity of sound α of fuel _LWhen pulsing absorbability to improve, the velocity of sound α of equal value in proportional therewith high frequency zone _HAlso can diminish, cause radiating sound and increase, become the parts that lack radiation sound inhibition effect, the result can produce card and eat the sound that card is eaten.

So, in fuel-supply pipe of the present invention, the assimilation effect from the pressure pulsation of jet nozzles that can not only improve that fuel nozzle causes, prevent pipe arrangement produces below the base plate vibration and noise well, the card the when guiding valve that can also suppress jet nozzles is seated at valve seat etc. is eaten the radiation that card is eaten sound sound etc., the high frequency zone.Thereby, the high price parts such as clip that there is no need to use pulsation damper and shock absorption to use, can reduce manufacture cost, can not become large volume, can suppress the increase of outside dimension, even engine compartment in etc. limited space also can be provided with, can obtain the good goods of layout property, can also replace with existing fuel-supply pipe, and can guarantee interchangeability as parts.

In addition, if make

For:

35 \times 10^{3} (m^{- 0.5} \cdot \sec^{- 1}) \leq α_{L} / \sqrt{V} \leq 85 \times 10^{3} (m^{- 0.5} \cdot \sec^{- 1});

Make α _L/ α _HFor: α _L/ α _H≤ 0.7, then can carry smaller motors (660～1000cc class) such as 4 cylinders, even if the reduction effect of pressure pulsation is smaller, also can be applicable in dilly etc. and uses.

Moreover, if

For:

20 \times 10^{3} (m^{- 0.5} \cdot \sec^{- 1}) \leq α_{L} / \sqrt{V} \leq 35 \times 10^{3} (m^{- 0.5} \cdot \sec^{- 1});

α _L/ α _HFor: 0.35≤α _L/ α _H≤ 0.7 words, then can obtain the absorptivity that prevents effect and pressure pulsation of good especially radiation sound, can carry the above big-block engine (1300～2500cc class) of 4～6 cylinders or 4～6 cylinders, be applicable on the vehicle that requires to reduce big pressure pulsation effect etc. and use.

In addition, the velocity of sound α of equal value in high frequency zone _HValue, on physical layer, say it is impossible surpass the velocity of sound that fuel be carried intrinsic fuel itself, if α _L/ α _HDiminish fuel velocity of sound α _LJust must reduce,, this means in order to increase amount of deformation to make the wall thickness attenuation as above-mentioned, but the problem of bringing durability to reduce.For this reason, the fuel that internal pressure produces during for fear of use is carried the breakage of body, owing to will make α _LValue be restricted, so, α _L/ α _HPreferably more than 0.35.

In addition, so long as be subjected to produce under the internal pressure effect bending, increasing the Any shape that fuel is carried the internal capacity of body thus, all can be used to form the absorption wall, but, if allow fuel carry inwardly side's bending of a part at least of body wall, preferably formation absorption wall then changes making this curved section to foreign side's deflection by means of internal pressure so that bigger radius of curvature is crooked smoothly, just can increase the internal capacity that fuel is carried body.As the effect of such absorption wall, in the occasion of the absorption wall that does not have inside side's curved wall, when adsorbing wall to foreign side's deflection, on the contrary, non-absorption wall portions inwardly side is shunk, and makes internal capacity be difficult to increase.Yet, allowing wall just be bent to form under the situation of absorption wall inwardly, curved section is in line to foreign side's bending deformation, distance between the end points that adsorbs wall just can extend, therefore, the non-absorption wall continuous with this absorption wall can inwardly not shrink, and can increase the increment rate that fuel is carried the internal capacity of body significantly towards foreign side's expansion on the contrary.

Description of drawings

Fig. 1 is the perspective view of the present invention the 1st embodiment's fuel-supply pipe.

Fig. 2 is the sectional view of the A-A line of Fig. 1.

Fig. 3 is that expression the 1st embodiment's fuel is carried body because internal pressure causes absorbs the wall deflection, makes fuel carry the schematic representation of the state that the internal capacity of body changes.

Fig. 4 is the main cross sections figure that the 2nd embodiment's fuel is carried body, and section configuration is horizontal mortar shape.

Fig. 5 is the main cross sections figure that the 3rd embodiment's flask shape fuel is carried body.

Fig. 6 is the main cross sections figure that the fuel of the 4th embodiment's key shaped is carried body.

Fig. 7～Figure 13 is the main cross sections figure that the 5th～the 11st embodiment's mortar shape fuel is carried body.

Figure 14～Figure 19 is the main cross sections figure that the 12nd～the 17th embodiment's goggles shape fuel is carried body.

Figure 20～Figure 23 is the main cross sections figure that the fuel of the 18th～the 21st embodiment's key shaped is carried body.

Figure 24 is the main cross sections figure that the 22nd embodiment's mortar shape fuel is carried body.

In addition, Figure 25～Figure 27 is the main cross sections figure of the 23rd～the 25th embodiment's flask shape fuel conveying body.

Figure 28 is the main cross sections figure that the fuel of the 26th embodiment's trapezoidal shape is carried body.

Figure 29 is the 27th embodiment, is a plurality of shaped sheets are made up the main cross sections figure that formed flask shape fuel is carried body.

Figure 30 is the 28th embodiment, is to make the overlapping formed flask shape fuel of a part of sheet material carry the main cross sections figure of body by means of pressure processing.

Figure 31 the 1st, the 2nd embodiment's that to be expression resolve according to FEM mortar shape fuel is carried the schematic representation of the situation of near the antinode of the gas column vibrational mode of the frequency 4kHz of body and node.

Figure 32 the 1st, the 2nd embodiment's that to be expression resolve according to FEM flask shape fuel carry body, near the schematic representation of the situation of the antinode of the gas column vibrational mode of frequency and the node 4kHz.

In addition, Figure 33 be expression the 2nd～the 6th in the past the pancake fuel of example carry body, near the schematic representation of the situation of the antinode of the gas column vibrational mode of frequency and the node 4kHz.A～I among this Figure 31～Figure 33 represents that fuel conveying internal pressure body, certain phase place changes.

In addition, Figure 34 be the 1st～the 4th in the past example and the 1st～the 4th embodiment's fuel carry body, about the gas column vibrational mode number in high frequency zone and the correlation curve between its frequency.

Figure 35 be about the 1st～the 4th in the past example and the 1st～the 4th embodiment's fuel carry the later linear approximation curve of pattern number of words 2 on the body.

Figure 36 be with equal the 1st embodiment and the 6th of pulsation absorptivity in the past each fuel of example radiation signal to noise ratio of carrying body than after curve.

Figure 37 is the section view that the 29th embodiment of protuberance is set in the way of the fuel conveying body of trapezoidal shape.

Figure 38 is the 30th embodiment, is the main cross sections figure with the fuel conveying body that is roughly flask shape section on band arch top.

Figure 39 is the 31st embodiment, is the main cross sections figure with fuel conveying body of the roughly trapezoidal cross-section of being with the arch top.

Figure 40 is the 32nd embodiment, is the main cross sections figure with fuel conveying body of the roughly key shaped section of being with the arch top.

Figure 41 is the 33rd embodiment of handstand flask shape, and Figure 42 is the main cross sections figure that the 34th embodiment's of handstand trapezoidal shape fuel is carried body, simultaneously, and with the sheet material combination of a plurality of shapings and form.

Figure 43 is that the central part that is illustrated in the long side wall is not provided with flat, carries body for the mortar shape fuel of level and smooth circular arc and be subjected to the schematic representation that the internal pressure effect makes the state that its internal capacity changes.

Figure 44 is that fuel that expression is roughly the flask shape carries body being subjected to the schematic representation that the internal pressure effect makes the state that its internal capacity changes.

Figure 45 is that the fuel of expression handstand flask shape carries body being subjected to the schematic representation that the internal pressure effect makes the state that its internal capacity changes.

Figure 46 is the sectional view that the fuel of fuel-supply pipe is in the past carried body and base.

Figure 47 is a schematic representation of representing the deformation state of the body of fuel conveying in the past.

Figure 48 be in experiment, use the 2nd～the 6th in the past the fuel of the flat pattern of example carry the sectional view of body.

Embodiment

Below, utilize accompanying drawing to describe embodiments of the invention in detail.At first, the 1st～the 25th embodiment's of the present invention fuel is carried the fuel velocity of sound α of body _L(m/s), cross-sectional area A (mm ²), internal capacity V (mm ³),

(m ^-0.5Sec ^-1), the velocity of sound α of equal value in high frequency zone _H(m/s), α _L/ α _HAnd wall thickness (mm) is illustrated in the following table 1.In addition, for the ease of relatively, the data that the fuel of carrying the data of body (the 1st example) in the past and being provided with the flat pattern of absorption wall with the fuel of the quadrangle form of absorption wall is carried body (the 2nd～the 6th example) have in the past also been expressed not.

[table 1]

The above-mentioned the 1st in the past the fuel of example carry body as shown in table 1, be the foursquare section configuration of being roughly of wide 16mm, high 16mm, wall thickness is 1.2mm, pipe range is 325mm.In addition, the 2nd～the 6th in the past example as shown in figure 48, it is flat pattern that fuel is carried the section configuration of body 81.And, the 2nd in the past example be the section configuration of the flat pattern of wide 28mm, high 10.2mm, wall thickness is 1.2mm, pipe range is 325mm.In addition, the 3rd in the past example be the section configuration of the flat pattern of wide 34mm, high 10.2mm, wall thickness is 1.2mm, pipe range is 325mm.The 4th in the past example be the section configuration of the flat pattern of wide 34mm, high 10.2mm, wall thickness is 1.2mm, pipe range is 175mm.The 5th in the past example be the section configuration of the flat pattern of wide 28mm, high 10.2mm, wall thickness is 1.2mm, pipe range is 175mm.The 6th in the past example be the section configuration of the flat pattern of wide 32.7mm, high 10.2mm, wall thickness is 1.0mm, pipe range is 325mm.

In addition, in each embodiment, fuel carries body to make by means of roll forming machine processing the pipe of the carbon steel of circular cross section, stainless steel etc. is processed formed special shape section.

Then, describe Fig. 1～the 1st embodiment shown in Figure 3 in detail, the 1st, fuel is carried body, and one face is provided with the base 2 that can connect the jet nozzles (not shown).For example, under the situation of 4 cylinder engines, 4 bases 2 are set by expectation interval and angle.In addition, fuel carries body 1 usefulness end cap 12 that two ends are sealed, and with soldering or be welded to connect and be fixed with fuel ingress pipe 3, this fuel ingress pipe 3 pipe arrangement (not shown) below base plate is connected on the fuel tank (not shown) on the one end.In addition, carry at fuel on the other end or side of body 1, though also can be set to return the recurrent canal of fuel tank,, return in nothing recurrent canal be not set on the type fuel-supply pipe.

And the fuel of this fuel tank pipe arrangement below base plate flows to fuel ingress pipe 3, shown in the arrow of Fig. 1, carries body 1 to flow from fuel ingress pipe 3 to fuel, is directly injected in inlet air pathway or the cylinder by the jet nozzles that is connected to base 2.And fuel is carried body 1 to be provided with to have at the installation side of base 2 to carry body 1 to be fastened on the firm carriage 4 of wall thickness required on the engine body fuel.

In addition, the 1st embodiment's fuel is carried body 1, as shown in Figure 2, and for having smooth 2 the short brink walls and the roughly mortar shape section of 2 long side walls of bending to the inside.And, allow the bottom surface as above-mentioned smooth short brink wall one side be lower part wall 5, base 2 is installed.And, will with top as short brink wall the opposing party of lower part wall 5 face-off as top wall 6.Connect this top wall 6 and lower part wall 5 as the left side wall 7 of long side wall and right side wall 8 as shown in Figure 2, with the joint of circular-arc formation top wall 6 with lower part wall 5, simultaneously, according to the trapezoidal shape of forming by smooth straight flange and a pair of hypotenuse, inwardly the side is bent to form, constitute a pair of flexible absorption wall 10, form the mortar shape that section configuration is roughly cydariform.Thereby, the variation of the internal pressure when spraying according to fuel from jet nozzles, inwardly the crooked absorption wall 10 in side can whereby, can increase the internal capacity that fuel is carried body 1 to foreign side's deflection deformation.

Above-mentioned the 1st embodiment's mortar shape fuel is carried body 1, constitutes with right side wall 8 by top wall 6, lower part wall 5 and by the left side wall 7 that bowing portion 11 is attached thereto.And, as shown in Figure 2, make left side wall 7 and right side wall 8 inwardly square with the trapezoidal shape bending, become the absorption wall 10 of high 33.6mm, allow this absorption wall 10 stand facing each other apart from 22mm with maximum outside diameter, simultaneously, the length of side that is roughly straight flange that makes this absorption wall 10 is 10.2mm, and the left side wall 7 of this straight portion is 15.2mm with the external diameter distance of right side wall 8.And as shown in table 1, making wall thickness is that to carry the cross-sectional area A of body 1 inside be 468mm for 1.2mm and fuel ², simultaneously, the formation pipe range is 325mm, whereby, internal capacity V is 150879mm ³, shown in Fig. 2 solid line, the base 2 of jet nozzles is set on lower part wall 5.

Also have, in the 2nd embodiment shown in Figure 4, form the shape of growing crosswise, the top wall 6 of this shape of growing crosswise is 33.6mm with the formation width of lower part wall 5, and the left side wall 7 that is attached thereto by bowing portion 11 is 22mm with the height of right side wall 8.And, make top wall 6 and lower part wall 5 inwardly square respectively with trapezoidal bending, form a pair of absorption wall 10.Simultaneously, the length of side that is roughly straight flange that makes this a pair of absorption wall 10 is 10.2mm, and the top wall 6 of this straight portion is 15.2mm with the external diameter distance of lower part wall 5.And as shown in table 1, making wall thickness is that to carry the cross-sectional area A of body 1 inside be 468mm for 1.2mm and fuel ², simultaneously, the formation pipe range is 325mm, whereby, internal capacity V is 150879mm ³, shown in Fig. 4 double dotted line, the base 2 of jet nozzles is set on lower part wall 5.

And, the 3rd embodiment's that another are different fuel is carried body 1, as shown in Figure 5, for trapezoidal top margin is provided with the flask shape that essentially rectangular becomes, top wall 6 and lower part wall 5 inwardly are bent to form the side, as absorption wall 10, left side wall 7 and right side wall 8 are made roughly straight flange, its section configuration is formed with the flask shape of growing crosswise.And the height of left side wall 7 is 9.4mm, and the height of right side wall 8 is 22mm, and left side wall 7 is 32mm with the external diameter distance of right side wall 8.In addition, by bowing portion 11, left side wall 7 and right side wall 8 are connected on the top wall 6 that is made of roughly straight flange and hypotenuse and the lower part wall 5 and form.This top wall 6 is 16.24mm with the length of the roughly straight flange of left side wall 7 sides of lower part wall 5.And, as shown in table 1, be 1.2mm by making wall thickness, can make fuel carry the cross-sectional area A of body 1 inside is 289mm ², simultaneously, the formation pipe range is 325mm, whereby, making internal capacity V is 93097mm ³, shown in Fig. 5 single-point line, lower part wall 5 roughly a side of straight flange be provided with the base 2 of jet nozzles.

Also have, different the 4th embodiment fuel is carried body 1 again, as shown in Figure 6, for 2 rectangles roughly of size being combined the key shape that become, top wall 6 and lower part wall 5 inwardly are bent to form the side, and as absorption wall 10, left side wall 7 and right side wall 8 are straight flange roughly, and its section configuration forms with the key shaped configuration of growing crosswise.And the height of left side wall 7 is 6.4mm, and the height of right side wall 8 is 13.6mm, and top wall 6 is 32mm with the formation width of lower part wall 5.Top wall 6 and lower part wall 5, form by the roughly straight flange of the long 12.73mm that is arranged on left side wall 7 sides being linked together with the roughly straight flange that is arranged on the long 9mm of right side wall 8 sides, and two end part are connected on top wall 6 and the lower part wall 5 by bowing portion 11 with hypotenuse.And as shown in table 1, by wall thickness is made 1.2mm, making fuel carry the cross-sectional area A of body 1 inside is 205mm ², simultaneously, be 325mm by forming pipe range, making internal capacity V is 66155mm ³, the roughly straight flange of the long 9mm of right side wall 8 sides of lower part wall 5 is provided with the base 2 of jet nozzles.In addition, table 1 shows the data of the situation of the key shaped that is configured among the flask shape that is configured to grow crosswise among the 3rd embodiment and the 4th embodiment to grow crosswise, but, can also be shown in Fig. 4, Fig. 5 double dot dash line, on left side wall 7 or right side wall 8, base 2 is set, make this wall towards the below, the flask shape, the key shaped that are configured to lengthwise use.Also have, in the 3rd embodiment of Fig. 5, be provided with on the left side wall 7 under the situation of base 2, fuel carries body 1 to become the flask shape of handstand.

Below, Fig. 7～Figure 13 is the 5th～11 embodiment, any one all is the fuel conveying body 1 of mortar shape.In addition, the 9th embodiment shown in Figure 11 is that the central authorities of long side wall are circular-arc mortar shape, and, Fig. 7～Figure 10, Figure 12, the the the 5th～the 8th, the 10th, the 11st embodiment shown in Figure 13, same with the 1st embodiment, be the mortar shape shape that the roughly cydariform of smooth straight flange is set in the central authorities of long side wall.Respectively there is shown section configuration and outside dimension, its wall thickness or cross-sectional area A, internal capacity V and pipe range all are illustrated in the table 1.In addition, in these the 5th～the 11st embodiments, be configured to the form of growing crosswise shown in each figure, on top wall 6 and lower part wall 5, dispose absorption wall 10, shown in single-point line, the base 2 of jet nozzles is set on lower part wall 5 and forms, the measurement of the velocity of sound shown in carry out table 1 etc.But, also can lengthways dispose up and down and use, in this case, shown in double dot dash line, base 2 is set on either party at right side wall 8 or left side wall 7, the wall that this base 2 is set is configured in the below uses.

In addition, Figure 14～the 12nd～the 17th embodiment shown in Figure 19, be by 2 long side walls and 2 essentially rectangulars that the short brink wall constitutes, just bending to the groove shape inwardly by means of the central part of a side's who makes way for 2 long side walls top wall 6 forms, form absorption wall 10 then, making section is the fuel conveying body 1 of goggles shape.At section configuration that respectively there is shown and outside dimension, its wall thickness, cross-sectional area A, internal capacity V and pipe range all are illustrated in the table 1.Here, though the 17th embodiment shown in Figure 19 is identical with the 13rd embodiment's outside dimension shown in Figure 15,, as shown in table 1, the 13rd embodiment's wall thickness is 1.2mm, cross-sectional area A is 234mm ², internal capacity V is 78993mm ³, and the 17th embodiment's wall thickness is 1.0mm, cross-sectional area A is 250mm ², internal capacity V is 84567mm ³In each embodiment, as shown in the figure, with the lower part wall 5 of top wall 6 opposition sides that groove sigmoid side is set on, shown in the single-point line, be provided with the base 2 of jet nozzles.In addition, even carry under the situation of body 1, also can dispose along the vertical direction and use at the fuel of goggles shape, even in this case, shown in double dot dash line, also can base 2 be set on either party at right side wall 8 or left side wall 7, the wall that this base 2 is set is configured in the below uses.

In addition, carry in the body 1 at the fuel of Figure 14～Figure 17 and goggles shape shown in Figure 19, though the top wall 6 as the long side wall forms abreast with lower part wall 5, but, carry in the body 1 at the 16th embodiment's shown in Figure 180 fuel, side's lower part wall 5 of long side wall is formed highlightedly to foreign side.

Also have, Figure 20～the 18th～the 21st embodiment shown in Figure 23 is a key shaped, the 22nd embodiment shown in Figure 24 is a mortar shape, Figure 25～the 23rd～the 25th embodiment shown in Figure 27 is that flask shape fuel is carried body 1, respectively there is shown section configuration and outside dimension, its wall thickness, cross-sectional area A, internal capacity V and pipe range all are illustrated in the table 1.Even in these the 18th～the 25th embodiments, also can dispose, the data that the situation of base 2 is set in the position shown in the single-point line are also illustrated in the table 1 with growing crosswise.But, also can lengthways dispose along the vertical direction, in this case, the base 2 of jet nozzles is set on the right side wall shown in the double dot dash line 8, also can be configured in the below to this right side wall 8 and use.Further,, also can under the long situation of left side wall 7, base 2 be set on left side wall 7, this left side wall 7 be configured in the below use as the 18th, the 22nd, the 23rd, the 24th, the 25th embodiment.

Shown in above-mentioned table 1, the 1st～the 25th embodiment and the 1st～the 6th is the fuel velocity of sound α through flowing in the fuel conveying body 1 of example in the past _L, use above-mentioned formula shown on and resolve and obtain by means of FEM.

In addition, the velocity of sound α of equal value in high frequency zone _H, be to carry out carrying the fuel in the body 1 to carry the model of body 1 coupling to resolve fuel with fuel, extract fuel more than severals kHz that (pull out I and go out The) thrown into question by the radiation sound out and carry the interior gas column sympathetic response pattern partly of body 1.In Figure 34, show in the 1st～the 4th embodiment and the 1st～the 4th in the past in the example, with the curve of pattern power of a number number of times and its frequency dependence.In addition, based on the curve of this Figure 34, in Figure 35, show in the 1st～the 4th embodiment and the 1st～the 4th in the past in the example linear approximation curve of (to fall) after the pattern number of times 2.And, obtain slope (f/n) from this curve, by means of above-mentioned formula 5, multiply by 2 times long (21) of track that each fuel is carried body 1 by giving this slope, can obtain the velocity of sound α of equal value in high frequency zone _H

In Figure 34, Figure 35, Li pattern power of a number number of times was roughly 1 in the past, when the pattern number of times is pattern count more than 2 and frequency when being approximately linear, roughly passed through initial point.That is to say fuel velocity of sound α _LVelocity of sound α of equal value with the high frequency zone _HBasic identical.

Relative with it, embodiment's pattern power of a number number of times is substantially greater than 1, and when the pattern number of times is pattern count more than 2 and frequency when being approximately linear, then the intersection point with X-axis is offset widely to the forward side, does not pass through initial point.That is to say, with fuel velocity of sound α _LCompare the velocity of sound α of equal value in high frequency zone _HBecome big, α _L/ α _H≤ 0.7.

Below, illustrate that with the 1st embodiment the pulsation of fuel-supply pipe of the present invention absorbs and the reduction effect of radiation sound.At first, along with fuel when the injection of jet nozzles produces pressure pulsation, fuel carries the flexible absorption wall 10 of body 1 to foreign side's deflection deformation, makes fuel carry the internal capacity of body 1 to increase.Fig. 3 carries out the skeleton diagram that FEM resolves to this internal capacity enlarging state, and the fuel before internal capacity increases carries the internal face of body 1 to dot, and the fuel when internal capacity increases carries the internal face of body 1 to represent with solid line.As shown in Figure 3, by the rising of internal pressure, flexible absorption wall 10 respectively to foreign side's deflection deformation, becomes straight line with distance イ, be that distance between top wall 6 and the lower part wall 5 is also elongated thereupon whereby, between the end points that respectively adsorbs wall 10 shown in the ロ of Fig. 3.

Thereby fuel carries the internal capacity of body 1 that big increase (1.1% degree) can be arranged, and is as shown in table 1, can dwindle fuel velocity of sound α with the degree of hundreds of Hz _L, because

α_{L} / \sqrt{V} \leq 45 \times 10^{3} (m^{- 0.5} \cdot \sec^{- 1})

Be inevitable, can dwindle α _LSo, can obtain the assimilation effect of good pressure pulsation.As a result, can suppress the pressure pulsation of below base plate pipe arrangement etc. or the transmission of noise well propagates.

On the other hand, after fuel sprays, be seated at the card that produces when valve seat etc. is gone up by the guiding valve of jet nozzles and eat the velocity of sound α of equal value that card is eaten sound etc., radiated the high frequency zone more than several kHz that sound has problems _HSituation under, in fuel-supply pipe in the past, make fuel velocity of sound α by being easy to deflection _LWhen diminishing, as shown in Figure 3, even also must make bending deformation big in the high frequency zone, pattern count also increases.Thus, as shown in table 1, though the velocity of sound α of equal value in high frequency zone _HAlso reducing, still, but be difficult to suppress the radiation sound.

Yet the 1st embodiment's fuel-supply pipe in the high frequency zone, adsorbs wall 10 for maintaining the model shape of a plurality of antinodes and node as shown in figure 31, becomes unbending shape, so the deflection of absorption wall 10 diminishes.Thereby, fuel velocity of sound α _LBe 287m/s, in contrast to this, the velocity of sound α of equal value in high frequency zone _HBe 663m/s, can not dwindle, compare, can suppress the radiation sound it is reduced with example in the past.

Figure 36 shows

Be approximative value, the curve that relatively radiates sound in the routine in the past fuel-supply pipe of same the 1st embodiment and the 6th of pulsation absorptivity.From this curve as can be seen, the 1st embodiment's fuel-supply pipe of the present invention with the 6th in the past example compare, improved the inhibition effect of radiation sound significantly.

In addition, also can form with the shape different with above-mentioned the 1st～the 25th embodiment, as shown in figure 28 again shown in different the 26th embodiment, can also form fuel in the following manner and carry body 1, promptly allow top wall 6 side narrowed width, lower part wall 5 side width broaden, and form with right side wall 8 with circular-arc gently crooked left side wall 7 by inside side is set, making section configuration is roughly trapezoidal shape.In addition, can also base 2 be set on lower part wall 5 use shown in the single-point line, perhaps, can also be, base 2 is set on top wall 6, this top wall 6 is configured in the below, the trapezoidal shape that becomes handstand uses.

In addition, above-mentioned the 1st～the 26th embodiment's fuel is carried body 1, can easily form by means of above-mentioned roll forming processing.In addition, it also can be as shown in figure 29 the 27th embodiment that fuel is carried body 1, makes after upper half part and lower half portion form separately discretely, the sheet material of these 2 shapings is made up, by formation such as soldering or welding.Moreover, can also be the 28th embodiment as shown in figure 30, after the dual coincidence in the two end part of pressure-formed sheet material, by means of fixing two end part and forming such as soldering or welding.Even in these cases, can also be configured to the flask shape of lengthwise or the flask shape of handstand, shown in the single-point line, base 2 is arranged on lower part wall 5 or the top wall 6, the wall that this base 2 is set is configured in the back, below to be used, can also be shown in double dot dash line, base 2 is arranged on the right side wall 8, use after the flask shape that is configured to grow crosswise.

Fig. 2, Fig. 4～sectional view shown in Figure 30, the main cross sections of representing each embodiment's fuel conveying body 1, carry the front end of body 1 length direction to the rear end from fuel, though not necessarily leave no choice but become same section configuration, but, according to installing space, preferably allow a part have the shape different with main cross sections.For example, the 29th embodiment as shown in figure 37 can be provided with protuberance 13 and adjust flow fuel as required in the way of fuel conveying body 1, perhaps, though do not show in the drawings, also can will dwindle in the way, prevents the interference with miscellaneous part.In addition, in the various embodiments described above, though 4 angles are provided with bowing portion 11,, also not necessarily leave no choice but make these 4 angles with bowing, the 29th embodiment for example shown in Figure 37 allows a part of angle form with dihedral, so also is easy to be shaped.But the internal pressure in the time of can improving fuel from jet nozzles and spray with the method for bowing changes the distortion correspondence of caused absorption wall 10.

In addition, Figure 38 is the roughly distortion of flask shape, and the fuel that shows the 30th embodiment of the roughly flask section that pushes up with the arch of circular-arc formation top wall 6 is carried body 1.And Figure 39 is the roughly distortion of trapezoidal shape, shows with the fuel as the 31st embodiment of the roughly trapezoidal cross-section on arch top of circular-arc formation top wall 6 and carries body 1.Moreover Figure 40 is the roughly distortion of key shape, and the fuel that shows the 32nd embodiment of the roughly key section that pushes up with the band arch of circular-arc formation top wall 6 is carried body 1.

Even under these the 30th, 31,32 embodiments' situation, also can lengthways dispose along the vertical direction, on smooth lower part wall 5, shown in the single-point line, be provided with base 2, also can dispose with growing crosswise, on the left side wall 7 or right side wall 8 below becoming, shown in double dot dash line, be provided with base 2.

Also have, the 33rd embodiment shown in Figure 41, when the fuel that forms handstand flask shape is carried body 1, allow after the section cup part of the bending that top wall 6 and lower part wall 5, left side wall 7 and the right side wall 8 of smooth ware shape constitute separates and form, under the state that mutual end is overlapped,, both sides are fixed and form by welding or soldering.

In addition, the 34th embodiment shown in Figure 42, when the fuel that forms trapezoidal shape is roughly carried body 1, after the bending part that allows smooth ware shape lower part wall 5 and top wall 6, left side wall 7 and right side wall 8 form separates and forms, under the state that mutual end is overlapped,, both sides are fixed and form by welding or soldering.

Also have, the central authorities that Figure 43 shows at the long side wall are not provided with carrying in the body 1 with the formed mortar shape of level and smooth circular arc fuel of flat, and the result that FEM resolves is carried out in the distortion that applies the internal pressure situation.As shown in figure 43, by means of the internal pressure of bearing, make internal face that fuel carries body 1 from the dotted line lateral expansion to solid line position, because horizontal amount of movement is big, so the amount of deformation of above-below direction then is confined to very little, the result shows that the increment rate of internal capacity can reach 1.1%.And then, even carry under the situation of body 1, also can bring into play effect and the effect same with the 1st embodiment of Fig. 3 at the fuel that roughly is mortar shape shape section shown in Figure 43.

At last, Figure 44 shows and is roughly the flask shape, Figure 45 show about the fuel of handstand flask shape carry body 1, effect has the distortion of internal pressure situation to carry out the result that FEM resolves.Even in this case, also can bring into play effect and the effect same with the 1st embodiment of Fig. 3.

Fuel of the present invention is carried body, owing to have above-mentioned formation, by means of the section configuration of axle Vertical direction being made mortar shape, flask shape, trapezoidal, key shaped, goggles shape etc., can increase the variance ratio of the internal capacity under the situation of bearing pressure same significantly, improved the pulsation assimilation effect of flexible absorption wall, suppressed the transmission of abnormal sound and propagated radiation.Owing to carry the boundary dimension of body with increasing fuel hardly, though with existing fuel-supply pipe displacement, also can be contained in the confined space in the engine compartment, can guarantee as the interchangeability of parts etc., technique effect is very significantly arranged.

And, carry the fuel velocity of sound α that flows in the body owing to make by fuel _LV is determined with internal capacity

Be 20 * 10 ³～85 * 10 ³(m ^-0.5Sec ^-1), fuel velocity of sound α _LVelocity of sound α of equal value with the high frequency zone _HRatio be α _L/ α _H≤ 0.7, by the deflection deformation of absorption wall, according to the variation of internal pressure, can make fuel carry the internal capacity of body to compare with conventional art significantly increases, so, improved the pressure pulsation assimilation effect when fuel sprays.Thereby the mechanical vibration in low frequency territory are difficult to propagate into below the base plate on pipe arrangement etc., can prevent the generation of noise well.And the pulsation in high frequency zone is difficult to make the fuel-supply pipe deflection, the velocity of sound α of equal value in high frequency zone _HCan not dwindle, the card that the guiding valve that can suppress jet nozzles well is seated at valve seat etc. when going up is eaten card and is eaten the sound in high frequency zone of sound etc. to the radiation of outside.So the noise that can suppress from low-frequency region to the high frequency zone takes place, need not use pulsation damper or shock absorption with clip etc., can reduce manufacture cost.

Claims

1. fuel-supply pipe, this fuel-supply pipe returns type fuel to the nothing in the loop that fuel tank returns and carries on the body and be connected with the fuel ingress pipe having jet nozzles and be not provided with, this fuel ingress pipe pipe arrangement below base plate is connected with fuel tank, it is characterized in that, on the wall of fuel conveying body, be formed with flexible absorption wall, variation by means of internal pressure, the deflection of flexible absorption wall, thus, can increase fuel and carry the internal capacity of body, simultaneously, carry the velocity of sound α of the fuel that flows in the body by fuel _LCarry the internal capacity V of body to be determined with fuel

For:

20 \times 10^{3} (m^{- 0.5} \cdot \sec^{- 1}) \leq α_{L} / \sqrt{V} \leq 85 \times 10^{3} (m^{- 0.5} \cdot \sec^{- 1}),

Described fuel velocity of sound α _LWith the velocity of sound α of equal value that carries the high frequency zone of the fuel that flows in the body by fuel _HRatio α _L/ α _HFor:

α _L/α _H≤0.7。

2. fuel-supply pipe according to claim 1 is characterized in that,

For:

10^{3} (m^{- 0.5} \cdot \sec^{- 1}) \leq α_{L} / \sqrt{V} \leq 85 \times 10^{3} (m^{- 0.5} \cdot \sec^{- 1}) .

3. fuel-supply pipe according to claim 1 is characterized in that, For:

α _L/ α _HBe: 0.35≤α _L/ α _H≤ 0.7.

4. fuel-supply pipe according to claim 1, it is characterized in that, flexible absorption wall is carried inwardly square crooked formation of at least a portion of body wall by making fuel, variation by means of internal pressure, curved section can increase the internal capacity that fuel is carried body whereby to foreign side's deflection.