KR102371318B1 - A pressure pulsation reducer for fuel rail - Google Patents

Abstract

The present invention relates to a pulsation reducing apparatus. More specifically, the present invention relates to the pulsation reducing apparatus in which a pulsation phenomenon is suppressed while making an injection flow rate of an injector uniform. In the pulsation reducing apparatus installed on a fuel rail, the provided fuel rail pulsation reducing apparatus comprises a pulsation disturbance unit accommodated in the fuel rail (300) while having different cross-sectional areas and lengths, transferring a fuel in the radial direction parallel to the longitudinal direction of the fuel rail (300) or having an inclination with respect to the longitudinal direction of the fuel rail (300), and reducing pulsation of the fuel rail (300). Accordingly, there is an advantage in that the pulsation phenomenon is suppressed while making the injection flow rate of the injector uniform.

Description

A pressure pulsation reducer for fuel rail

The present invention relates to a pulsation reducing device, and more particularly, to a pulsation reducing device capable of suppressing pulsation while making the injection flow rate of an injector uniform.

The fuel rail module is a device that can manage the fuel system as one integrated system by modularizing and assembling the main products required for fuel injection.

Here, the fuel supply system may include an engine controller, a high-pressure pump, a fuel rail, a high-pressure sensor, and an injector as shown in FIG. 1 .

Fuel injection proceeds in the following order.

The high-pressure pump first compresses the low-pressure fuel received from the fuel pump through the signal received by the engine controller (ECU) as shown in FIG. 1 and supplies it to the fuel rail at high pressure.

The fuel rail maintains and stores the fuel and pressure supplied from the high-pressure pump, and supplies fuel so that the injector can control the precise injection amount.

As shown in FIG. 2 , the engine controller 50 receives the feedback of the pressure of the high pressure sensor (HPS) mounted on the fuel rail 30 to measure the fuel pressure, and drives the pump 10 for maintaining the pressure and the injector 40 for fuel injection. ) to control the running time.

In this process, it is necessary to maintain the pressure inside the fuel rail and to compensate the pressure after injecting the injector so that the fuel injection amount through the injector can be accurately controlled.

A pulsation phenomenon occurs in the fuel supply process, which is a problem.

As shown in FIG. 3 , conventionally, the pulsation phenomenon 20 of the fuel supplied from the high-pressure pump 10 has been resolved through the orifice 60 in order to reduce the pulsation phenomenon.

However, in this prior art, although the pulsation phenomenon could be partially reduced due to the damping effect of the orifice 60, a change in the injection flow rate of the injector 40 by the difference in pressure due to the pulsation caused another problem. Doing it is the problem.

KR 2086703 B1

An object of the present invention for overcoming the above problems of the prior art is to provide a fuel rail pulsation reducing device capable of suppressing pulsation while ensuring the uniformity of the injection flow rate of the injector.

A pulsation reducing device installed on a fuel rail (300), comprising: a fuel transport body accommodated in the fuel rail (300) and having an internal transport pipe through which fuel is transported; a fuel carrier radiation pipe passing through from the inner transport pipe of the fuel carrier to an outer surface of the fuel carrier; a plurality of connecting pipes 200 alternately connecting the inner transfer pipe of the fuel carrier and the inner transfer pipe of the fuel carrier to each other;
Fuel rail pulsation for reducing the pulsation of the fuel rail 300 as the fuel introduced into the fuel rail is branched into the fuel carrier radiation pipe while passing through the inner transfer tube of the fuel carrier through the connection pipe 200 . Includes abatement devices.

In addition, the shape of the fuel carrier includes a fuel rail pulsation reducing device, characterized in that the ball (ball).

In addition, the inner transfer pipe includes a fuel rail pulsation reducing device, characterized in that the fuel transfer ball central tube 130 penetrating the center of the ball-shaped fuel transfer body.

In addition, the fuel transfer ball center pipe 130 includes a fuel rail pulsation reducing device, characterized in that it is connected to the fuel pipe 200 for transferring the fuel.

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In addition, it includes a fuel rail pulsation reducing device, characterized in that it further comprises a; closing caps (401, 402) for closing the end of the fuel rail (300).

In addition, any one of the closing caps (401, 402) includes a fuel rail pulsation reducing device, characterized in that coupled to the connection pipe (200).

In addition, the fuel transfer ball 100 and the inner wall of the fuel rail 300 includes a fuel rail pulsation reducing device, characterized in that the annular linear contact.

In addition, in the pulsation reducing device installed on the fuel rail 600, a pulsation disturbance part composed of one or more intaglio grooves to reduce pulsation of the fuel transferred from the fuel rail 600 is formed along the outer circumferential surface. Ball 500; At least one fuel rail ball 500 is accommodated in the fuel rail 600 and includes a fuel rail pulsation reducing device for reducing pulsation of the fuel rail 600.

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In addition, a pair of the plurality of intaglio grooves maximally spaced apart from each other is formed symmetrically on the outer circumferential surface of the fuel rail ball 500 with respect to the center of the fuel rail ball 500. Fuel rail pulsation reduction includes the device.

In addition, the intaglio groove includes a first portion 511 engraved to have the same predetermined diameter as it goes from the outer peripheral surface of the fuel rail ball 500 toward the center 501 of the fuel rail ball 500; A second part (512) extending from the first part (511) and having a diameter gradually narrower as it goes toward the center of the fuel rail ball (500); includes a fuel rail pulsation reducing device comprising a; do.

In addition, a diameter of the fuel rail ball 500 is smaller than the inner diameter of the fuel rail and includes a fuel rail pulsation reducing device, characterized in that it is larger than the inner diameter of the injector fuel supply hole 700 .

In addition, when the fuel rail ball 500 is accommodated in the injector fuel supply hole 700 so that the center of the fuel rail ball 500 and the center of the injector fuel supply hole 700 are on a straight line with each other, the fuel A recessed portion formed to be spaced apart from the outer circumferential surface of the rail ball 500 and extended from the inner circumferential surface of the injector fuel supply hole 700 to the inner circumferential surface of the fuel rail so that fuel can exit the injector fuel supply hole 700 ( 701,702); It includes a fuel rail pulsation reducing device, characterized in that it further comprises.

According to the present invention as described above, there are the following effects.

It has the advantage of suppressing pulsation while making the injection flow rate of the injector uniform.

1, 2 and 3 are prior art
4 is a view of a ball and a connecting pipe according to a first preferred embodiment of the present invention.
5 is a pulsation disturbance unit according to a first preferred embodiment of the present invention;
6 is a view of the arrangement of the pulsation disturbance part inside the fuel rail according to the first preferred embodiment of the present invention;
7 is a cross-sectional perspective view of a ball according to a second preferred embodiment of the present invention.
8 is a view in which a plurality of balls are provided inside a fuel rail according to a second preferred embodiment of the present invention;
9 is a view in which a ball is provided inside a fuel rail according to a second preferred embodiment of the present invention;

Since the present invention can have various changes and can have various embodiments, specific embodiments are illustrated in the drawings and will be described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

In describing each figure, like reference numerals are used for like elements.

Terms such as first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another.

For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. The term “and/or” includes a combination of a plurality of related listed items or any of a plurality of related listed items.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Terms such as those defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present application. shouldn't

4 is a view of the fuel transfer ball 100 and the connecting pipe 200 according to the first preferred embodiment of the present invention.

The fuel rail pulsation reducing device according to the first preferred embodiment of the present invention is installed on the fuel rail 300, and may largely include a fuel transport body and a fuel transport body radiation tube.

The fuel transport body is accommodated in the fuel rail 300 and a penetrating internal transport pipe is formed so that the fuel is transported.

The fuel carrier radiation tube is a portion penetrating from the inner transport pipe of the fuel carrier to the outer surface of the fuel carrier.

The fuel rail pulsation reducing device is a principle of reducing the pulsation of the fuel rail 300 by branching the fuel introduced into the fuel rail into the fuel carrier radiation pipe while passing through the internal transfer tube of the fuel carrier.

In more detail, the fuel rail pulsation reducing device according to the first preferred embodiment of the present invention may include a fuel transfer ball 100 , a fuel transfer ball radiation tube 120 , and a fuel transfer ball center tube 130 .

The fuel transfer ball 100 is accommodated in the fuel rail 300 .

The fuel transfer ball center tube 130 is a part penetrating the center of the fuel transfer ball 100 .

The fuel transfer ball radiating tube 120 is a portion penetrating from the fuel transfer ball center tube 130 to the outer peripheral surface of the fuel transfer ball 100 .

In the fuel rail pulsation reducing device according to the first preferred embodiment of the present invention, the fuel introduced into the fuel rail passes through the fuel transfer ball 100 central pipe and branches into the fuel transfer ball radiating pipe 120, so that the fuel rail 300 It is the principle of reducing the pulsation of

Hereinafter, it will be described in more detail with reference to the accompanying drawings.

The fuel transfer ball 100 has a circular spherical shape as a whole, and includes a coupling portion 110 , a first fuel transfer ball radiation tube 121 , a second fuel transfer ball radiation tube 122 , and a third fuel transfer ball radiation tube 123 . and a space portion 130 .

The fuel transfer ball 100 may have a first fuel transfer ball radiation tube 121 , a second fuel transfer ball radiation tube 122 , and a third fuel transfer ball radiation tube 123 formed on an outer peripheral surface, and the number increases or decreases. is possible

In more detail, the first fuel transfer ball radiation tube 121 , the second fuel transfer ball radiation tube 122 , and the third fuel transfer ball radiation tube 123 are hollow spaces inside the fuel transfer ball 100 . Fluid communication with the fuel transfer ball center pipe 130 is possible.

In other words, the fuel transfer ball center tube 130 is an empty space formed to accommodate fuel inside the fuel transfer ball 100 , and the fuel transfer ball center tube 130 communicates with the coupling part 110 .

The coupling part 110 is an opening formed on opposite sides of the fuel transfer ball 100 , and is formed with a circular inner circumferential surface.

In more detail, a pair of coupling units 110 may be provided at positions spaced apart from each other at maximum from the fuel transfer ball 100 .

The inner diameter of the inner circumferential surface of the coupling portion 110 is formed so that the outer circumferential surface of the connecting pipe 200 is accommodated and fixed.

In other words, the connection pipe 200 is interpolated into the coupling part 110 , and the fuel flowing into the connection pipe 200 can be supplied toward the fuel transfer ball center pipe 130 of the fuel transfer ball 100 . .

The connecting pipe 200 is a hollow pipe having a constant diameter.

The fuel inside the fuel transfer ball center tube 130 is transferred to the fuel transfer ball ( 100) can be ejected to the outside.

Hereinafter, the term “equator” refers to a circular virtual line connecting two points that are maximally separated from each other on the surface of the ball by the shortest distance.

In addition, "longitude" refers to a circular virtual line that connects two points that are maximum apart from each other on the surface of the ball by the shortest distance, but is formed to be perpendicular to the equator.

The first fuel transfer ball radiation tube 121 and the third fuel transfer ball radiation tube 123 may be disposed at the equator formed on the outer peripheral surface of the fuel transfer ball 100 .

The second fuel transfer ball radiation tube 122 may be formed to be biased toward the coupling portion 110 at a location spaced apart from the equator.

In other words, the second fuel transfer ball radiation tube 122 may be disposed on a hardness that is an imaginary line connecting between the coupling part 110 and the third fuel transfer ball radiation tube 123 .

Accordingly, the fuel supplied into the fuel transfer ball center tube 130 by the connecting pipe 200 is the first fuel transfer ball radiation tube 121 , the second fuel transfer ball radiation tube 122 , and the third fuel transfer ball It may be ejected to the outside of the fuel transfer ball 100 through the radiation tube 123 , at this time, the fuel is connected through the first fuel transfer ball radiation tube 121 and the third fuel transfer ball radiation tube 123 . It can be sprayed with the longitudinal direction and inclination of the pipe 200 .

In more detail, the fuel is radially ejected in a direction perpendicular to the longitudinal direction of the connection pipe 200 through the first fuel transfer ball radiation tube 121 and the third fuel transfer ball radiation tube 123 , and the second Through the fuel transfer ball radiation pipe 122 , the fuel is ejected in a direction forming an acute angle with the longitudinal direction of the connection pipe 200 for injecting fuel into the fuel transfer ball center tube 130 .

On the other hand, a second coupling part of the same type is also formed on the opposite side to the coupling part 110 , and another connecting pipe 200 may be connected to the second coupling part as well.

As described above, it is shown in FIG. 5 that the plurality of fuel transfer balls 100 and the connecting pipe 200 are alternately linearly connected to each other.

As shown in FIG. 5 , the fuel transfer ball 100 is a first fuel transfer ball 101 , a second fuel transfer ball 102 , a third fuel transfer ball 103 , a fourth fuel transfer ball 104 , and a fifth of the same type. It may include a fuel transfer ball 105, a sixth fuel transfer ball 106, and the connecting pipe 200 is a first connecting pipe 201, a second connecting pipe 202, a third connecting pipe of the same type ( 203), a fourth connection pipe 204, and a fifth connection pipe 205 may be included.

A plurality of first fuel transfer ball 101, second fuel transfer ball 102, third fuel transfer ball 103, fourth fuel transfer ball 104, fifth fuel transfer ball 105, sixth fuel The transfer ball 106 and a plurality of first connecting pipes 201, second connecting pipes 202, third connecting pipes 203, fourth connecting pipes 204, and fifth connecting pipes 205 are combined. The combined body will be referred to as a pulsation reducing assembly (or pulsation disturbing unit).

On the other hand, a plurality of first fuel transfer ball 101, second fuel transfer ball 102, third fuel transfer ball 103, fourth fuel transfer ball 104, fifth fuel transfer ball 105, 6 The fuel transfer ball 106 and the plurality of first connecting pipes 201, second connecting pipes 202, third connecting pipes 203, fourth connecting pipes 204, and fifth connecting pipes 205 are Each number can be increased or decreased, and the total length of the pulsation reducing assembly can be adjusted accordingly.

A first connection pipe 201 may be coupled to the right side of the first fuel transfer ball 101 .

A first connection pipe 201 may be coupled to the left side of the second fuel transfer ball 102 and a second connection pipe 202 may be coupled to the right side.

A second connecting pipe 202 may be coupled to the left side and a third connecting pipe 203 may be coupled to the right side of the third fuel transfer ball 103 .

The third connecting pipe 203 may be coupled to the left side and the fourth connecting pipe 204 may be coupled to the right side of the fourth fuel transfer ball 104 .

A fourth connecting pipe 204 may be coupled to the left side and a fifth connecting pipe 205 may be coupled to the right side of the fifth fuel transfer ball 105 .

A sixth fuel transfer ball 106 may be coupled to the right side of the fifth connection pipe 205 .

Another connection pipe 200 may be connected to the right side of the sixth fuel transfer ball 106 .

The fuel may be transferred along the longitudinal direction of the connecting pipe 200 through the connecting pipe 200 , and the fuel transferred in this way is the first fuel transfer ball 101 , the second fuel transfer ball 102 , and the third The fuel transfer ball 103 , the fourth fuel transfer ball 104 , the fifth fuel transfer ball 105 , and the sixth fuel transfer ball 106 may be injected to the outside of the ball through fuel injection holes formed respectively.

Meanwhile, the pulsation reducing assembly may be accommodated in the fuel rail 300 , and both ends of the fuel rail 300 may be closed by the first closing cap 401 and the second closing cap 402 , respectively.

At this time, it may be preferable that the fuel transfer ball 100 and the inner wall of the fuel rail 300 make an annular linear contact.

Therefore, when fuel is injected, the pulsation reducing assembly can be suppressed from shaking up, down, left and right in the longitudinal direction of the fuel rail 300 .

On the other hand, the connection pipe 200 may be connected to and fixed to the second closing cap 402 , and a fuel supply channel for providing fuel to the connection pipe 200 may be formed in the second closing cap 402 .

Since the pulsation reduction assembly is composed of a plurality of fuel transfer balls 100 and a plurality of connection pipe 200 assemblies, it can be seen that the length can be adjusted according to the length of the fuel rail 300 .

As described above, the pulsation disturbance unit (or pulsation reducing assembly) of the first preferred embodiment of the present invention is accommodated inside the fuel rail 300 while having different cross-sectional areas and lengths to reduce the pulsation of the fuel rail 300 .

Next, a pulsation disturbance unit (or pulsation reducing assembly) according to a second preferred embodiment of the present invention will be described.

7 is a cross-sectional perspective view of a fuel rail ball 500 according to a second preferred embodiment of the present invention.

The pulsation disturbance unit may include a fuel rail ball 500 having a plurality of intaglio grooves formed on the outer circumferential surface while the inside is filled.

The fuel rail ball 500 is a sphere filled inside, and a first engraved groove 510, a second engraved groove 520, a third engraved groove 530 and a fourth engraved groove 540 are formed on the outer circumferential surface. can be

In more detail, the first intaglio groove 510 , the second intaglio groove 520 , the third intaglio groove 530 and the fourth intaglio groove 540 are formed at equal intervals on the equator of the fuel rail ball 500 . can be

On the other hand, another engraved groove may be formed at equal intervals on the hardness of the fuel rail ball (500).

The first intaglio groove 510 and the third intaglio groove 530 are formed on opposite sides with respect to the central portion 501 , and the second intaglio groove 520 and the fourth intaglio groove 540 have the central portion 501 . formed on opposite sides of the center.

Since the first intaglio groove 510 , the second intaglio groove 520 , the third intaglio groove 530 and the fourth intaglio groove 540 are identical to each other, the following description will be made based on the first intaglio groove 510 .

The first intaglio groove 510 may include a first portion 511 and a second portion 512 .

The first portion 511 is engraved to have the same predetermined diameter as it goes from the outer peripheral surface of the fuel rail ball 500 toward the center 501 of the fuel rail ball 500 .

The second portion 512 is extended from the first portion 511 and is formed to gradually narrow in diameter as it enters toward the center of the fuel rail ball 500 .

A pair of the plurality of intaglio grooves spaced apart from each other may be symmetrically formed on the outer circumferential surface of the fuel rail ball 500 with respect to the center of the fuel rail ball 500 .

On the other hand, the fuel rail 600 may be provided with an injector fuel supply hole 700 so that fuel is provided to the injector.

In more detail, FIG. 8 is a view showing a plurality of fuel rail balls 500 provided inside a fuel rail 600 according to a second preferred embodiment of the present invention, and FIG. 9 is a view showing a second preferred embodiment of the present invention. It is a state in which the fuel rail ball 500 is provided inside the fuel rail 600 .

A first depression 701 and a second depression 702 may be formed around the injector fuel supply hole 700 .

At this time, it may be preferable that the diameter of the fuel rail ball 500 is smaller than the inner diameter of the fuel rail 600 and larger than the inner diameter of the injector fuel supply hole 700 .

The depression may include a first depression 701 and a second depression 702 .

The first recessed part 701 and the second recessed part 702 help fuel to smoothly exit the injector fuel supply hole 700 .

More specifically, the first recessed part 701 and the second recessed part 702 are formed to extend from the inner circumferential surface of the injector fuel supply hole 700 to the inner circumferential surface of the fuel rail.

Meanwhile, when fuel exits the injector fuel supply hole 700 , the fuel rail ball 500 may contact the injector fuel supply hole 700 and be accommodated.

At this time, when the center of the fuel rail ball 500 and the center of the injector fuel supply hole 700 are in a straight line with each other, the first recessed part 701 and the second recessed part 702 are the fuel rail ball 500 . Since it is formed to be spaced apart from the outer circumferential surface of the fuel, the fuel can smoothly exit the injector fuel supply hole 700 .

As shown in FIG. 8 , a plurality of fuel rail balls 500 according to the second preferred embodiment of the present invention may be accommodated in the fuel rail 600 and provided.

Since the third closing cap 403 closes one end of the fuel rail 600 and the fourth closing cap 404 closes the other end of the fuel rail 600 , a plurality of fuel rail balls inside the fuel rail 600 . (500) does not escape to the outside of the fuel rail (600).

The pulsation disturbance unit may refer to at least one or more fuel rail balls 500 .

At least one pulsation disturbance unit is accommodated in the fuel rail, and the pulsation of the fuel rail can be reduced by disturbing the flow of fuel so that the fuel transferred from the fuel rail has a radial direction having an inclination with respect to the longitudinal direction of the fuel rail. .

In other words, the fuel rail ball 500 has a first engraved groove 510 , a second engraved groove 520 , a third engraved groove 530 , and a fourth engraved groove 540 formed so that the contact area with the fuel is Since it is increased, the plurality of fuel rail balls 500 effectively disturb the flow of fuel inside the fuel rail 600 , thereby reducing the pulsation of the fuel rail.

100: fuel transfer ball
101: first fuel transfer ball
102: second fuel transfer ball
103: third fuel transfer ball
104: fourth fuel transfer ball
105: fifth fuel transfer ball
106: sixth fuel transfer ball
110: coupling part
120: fuel transfer ball radiation tube
121: first fuel transfer ball radiation tube
122: second fuel transfer ball radiating tube
123: third fuel transfer ball radiating tube
130: fuel transfer ball center pipe
200: connection pipe
201: first connection pipe
202: second connection pipe
203: third connecting pipe
204: fourth connecting pipe
205: fifth connecting pipe
300, 600: fuel rail
401: first closing cap
402: second closing cap
403: third closing cap
404: fourth closing cap
500: fuel rail ball
501 : center
510: first engraved groove
511: first part
512: second part
520: second engraved groove
530: third engraved groove
540: fourth engraved groove
700: injector fuel supply hole
701: first depression
702: second depression

Claims (14)

In the pulsation reduction device installed on the fuel rail,
a fuel transport body accommodated in the fuel rail and having an internal transport pipe through which fuel is transported;
a fuel carrier radiation pipe passing through from the inner transport pipe of the fuel carrier to an outer surface of the fuel carrier;
a plurality of connecting pipes alternately connecting the inner transfer pipe of the fuel carrier and the inner transfer pipe of the fuel carrier;
Reducing the pulsation of the fuel rail as the fuel introduced into the fuel rail is branched into the fuel carrier radiation tube while passing through the internal transfer tube of the fuel carrier through the connection pipe,
Fuel rail pulsation reduction device.
According to claim 1,
The shape of the fuel carrier, characterized in that the ball (ball),
Fuel rail pulsation reduction device.
3. The method of claim 2,
The inner transfer pipe is characterized in that the fuel transfer ball center pipe passing through the center of the ball-shaped fuel transfer body,
Fuel rail pulsation reduction device.
4. The method of claim 3,
The fuel transfer ball center pipe is characterized in that it is connected to the connection pipe for transferring the fuel,
Fuel rail pulsation reduction device.
delete According to claim 1,
A closing cap for closing the end of the fuel rail; characterized in that it further comprises,
Fuel rail pulsation reduction device.
7. The method of claim 6,
Any one of the closing cap is characterized in that coupled to the connection pipe,
Fuel rail pulsation reduction device.
According to claim 1,
The fuel carrier and the inner wall of the fuel rail are in annular linear contact,
Fuel rail pulsation reduction device.
In the pulsation reduction device installed on the fuel rail,
a fuel rail ball formed along an outer circumferential surface of a pulsation disturbance portion comprising a plurality of intaglio grooves to reduce pulsation of fuel transferred from the fuel rail;
One or more of the fuel rail balls are accommodated in the fuel rail,
To reduce the pulsation of the fuel rail,
Fuel rail pulsation reduction device.
delete 10. The method of claim 9,
A pair of the plurality of intaglio grooves that are maximally spaced apart from each other is characterized in that they are formed symmetrically with each other on the outer circumferential surface of the fuel rail ball with respect to the center of the fuel rail ball,
Fuel rail pulsation reduction device.
10. The method of claim 9,
The engraved groove includes: a first portion engraved to have the same predetermined diameter as it goes from the outer peripheral surface of the fuel rail ball toward the center of the fuel rail ball;
A second part extending from the first part and formed to have a diameter gradually narrower as it enters the center of the fuel rail ball; characterized in that it comprises;
Fuel rail pulsation reduction device.
10. The method of claim 9,
A diameter of the fuel rail ball is smaller than an inner diameter of the fuel rail and is larger than an inner diameter of an injector fuel supply hole formed in the fuel rail,
Fuel rail pulsation reduction device.
14. The method of claim 13,
When the fuel rail ball is accommodated in the injector fuel supply hole and the center of the fuel rail ball and the center of the injector fuel supply hole are in a straight line with each other, the fuel rail ball is formed to be spaced apart from the outer peripheral surface of the fuel rail ball, so that fuel is supplied to the injector fuel supply a depression formed extending from an inner circumferential surface of the injector fuel supply hole to an inner circumferential surface of the fuel rail so as to exit the hole; characterized in that it further comprises,
Fuel rail pulsation reduction device.

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