JP3310146B2 - Fuel piping system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention constitutes a part of a fuel supply device for supplying fuel to, for example, an engine for an automobile, and a plurality of fuel injection valves provided in each cylinder of the engine. The present invention relates to an injection valve-integrated fuel piping device attached to a fuel pipe.

[0002]

2. Description of the Related Art In order to supply fuel to a plurality of fuel injection valves disposed in a multi-cylinder engine for an automobile, a fuel piping system is provided near each of the fuel injection valves and integrally mounted thereto. It has been known.

[0003] Fig. 9 shows a fuel supply device provided with a fuel piping device of this kind in the related art.

In FIG. 1, reference numeral 1 denotes a fuel tank, and 2 denotes a fuel pump provided in the fuel tank 1. The fuel pump 2 supplies an external fuel, such as gasoline, stored in the fuel tank 1 to the outside, which will be described later. It is discharged into the pipe 6.

[0005] Reference numeral 3 denotes a fuel pipe device (generally referred to as a "gallery type"). The fuel pipe device 3 has a bottomed tubular fuel pipe main body 3A and a longitudinally extending fuel pipe main body 3A. The injection valves 4, 4
Are mounted (for example, four injection valve mounting ports 3)
B, 3B,..., And the fuel from the fuel pump 2 introduced into the fuel pipe main body 3A flows from each injection valve 4 attached to each injection valve attachment port 3B into each cylinder of the engine 5 described later. It is injected.

Reference numerals 4, 4,... Denote a plurality (for example, four) of injection valves. Each of the injection valves 4 is provided for each cylinder (not shown) of the four-cylinder engine 5. Are attached to the respective injection valve attachment ports 3B. Each of the injection valves 4 injects the fuel supplied from the fuel pump 2 to the fuel piping device 3 via the supply pipe 6 into each cylinder at a predetermined injection timing.

[0007] Numeral 6 designates the fuel from the fuel pump 2 for each injection valve 4
One side of the supply pipe 6 is connected to the fuel pump 2, and the other side is connected to the fuel pipe main body 3 </ b> A of the fuel pipe apparatus 3 via the fuel filter 7 and the pressure regulator 8.

Reference numeral 8 denotes a pressure regulator located between the fuel pump 2 and the fuel piping device 3 and connected to the other end of the supply pipe 6, and the pressure regulator 8 controls the pressure inside the intake manifold (not shown). Is guided through the air conduit 9 to adjust the fuel pressure (fuel pressure) in the supply pipe 6 and the like.

Reference numeral 10 denotes a return pipe connected to the outlet side of the pressure regulator 8, and the return pipe 10 sequentially returns the surplus oil of the fuel whose pressure has been adjusted by the pressure regulator 8 into the fuel tank 1. ing.

In the fuel supply device configured as described above,
The fuel supplied from the fuel pump 2 into the supply pipe 6 is fuel-pressure-adjusted by the pressure regulator 8, and this fuel-pressure-adjusted fuel is injected into each cylinder of the engine 5 from each injection valve 4 provided in the fuel pipe device 3. Inject toward. In this case, the injection timing of the fuel injected from each injection valve 4 is controlled based on a signal from a crank angle sensor (not shown) or the like in accordance with the intake stroke of each cylinder, and the injection amount is controlled by the engine speed. , Based on the theoretical injection amount calculated according to the intake air amount and the like.

In the above-described fuel supply device,
By providing the fuel piping device 3 on the downstream side of the pressure regulator 8, only the fuel piping device 3 is disposed near the engine 5 (in the engine room R), and the return piping connected to the outlet side of the pressure regulator 8. Reference numeral 10 is arranged outside the engine room R. For this reason,
The surplus oil returned to the fuel tank 1 through the return pipe 10 is not heated in the engine 5 and the engine room R, which have become hot, so that even when the remaining fuel amount in the fuel tank 1 is small, the surplus oil The generation of evaporative gas can be reduced without heating the fuel in the fuel tank 1.

[0012]

In the fuel supply device according to the prior art described above, the fuel pipe device 3 provided downstream of the supply pipe 6 has an elongated fuel pipe main body 3A and a fuel pipe main body 3A. .. Are arranged in the longitudinal direction so as to be spaced apart from each other, and the fuel introduced from the fuel pump 2 to the supply pipe 6 is
The fuel is supplied from the fuel pipe main body 3A of the fuel pipe device 3 to each of the injection valves 4 via each of the injection valve mounting ports 3B.

Here, since each injection valve 4 is arranged so as to be aligned in the longitudinal direction of the fuel pipe main body 3A, the fuel introduced into the fuel pipe main body 3A of the fuel pipe device 3 is supplied to each injection valve 4A. Will be different for each injection valve 4. Since the fuel piping device 3 is disposed near the engine 5, the temperature (fuel temperature) of the fuel flowing through the fuel piping main body 3 </ b> A becomes high due to the heat from the engine 5. Therefore, the fuel injected from each injection valve 4 becomes hotter and more likely to be vaporized as the distance flowing through the fuel pipe main body 3 </ b> A becomes longer, and the separation distance from the connection with the supply pipe 6 becomes larger. In the cylinder in which the injection valve 4 is provided, the air-fuel ratio tends to lean. As described above, the air-fuel ratio of each cylinder of the engine 5 corresponding to each injection valve 4 is different due to the temperature difference of the fuel injected from each injection valve 4, so that the air-fuel ratio control for the engine 5 can be performed with high accuracy. There is a problem that cannot be performed.

The present invention has been made in view of the above-mentioned problems of the prior art. By equalizing the temperature of fuel for each cylinder of an engine, it is possible to perform highly accurate air-fuel ratio control and the like. It is an object of the present invention to provide a fuel piping device which is made as described above.

[0015]

Means for Solving the Problems In order to solve the above problems, the present invention is, from the fuel inlet has a fuel inlet
A fuel pipe body inflow fuel flowing inside, provided to the fuel pipe body for mounting the fuel injection valve, respectively, fuel pipe comprising a fuel pipe plurality of injection valves installation opening spaced from each other in the longitudinal direction of the body Applies to equipment.

A feature of the structure adopted in the first aspect of the present invention is that the fuel pipe main body has a configuration in which the fuel inflow port has a longitudinal direction.
Constituted by a single pipe provided toward the central portion, the fuel inside the pipe body, fuel distribution to a plurality of fuel passages communicating individually with said fuel inlet and the injection valve mounting hole respectively Means is provided, and the fuel passages formed by the fuel distribution means are configured so that their passage lengths are substantially equal to each other.

Further, according to a second aspect of the present invention, the fuel distribution means comprises an insertion pipe provided in the fuel pipe main body, and the insertion pipe is opened at a position substantially equal to the plurality of injection valve mounting ports. The fuel distribution port is provided.

Further, according to the third aspect of the present invention , the fuel distribution means includes an inner pipe extending in the fuel pipe main body in the axial direction and an intermediate portion in the axial direction of the inner pipe. constructed from the fuel distribution orifice and which is provided at substantially equal position with respect to the plurality of injection valves mounting opening, the inside of the intubation is a first passage portion, the space between the fuel pipe body and the inner cannulated first When the first and second passages are the same,
Communicate with each other through the dispensing port, first, the length of the fuel passage and a second passage portion Ru Tei a substantially equal configuration for each of the respective injection valve mounting hole.

[0019] Then, the invention of claim 4, the fuel pipe body, that has a pulsation suppressing means for suppressing the pulsation of the fuel located in the vicinity of the front Symbol fuel inlet configured settings only that.

The invention of claim 5according to, The fuel
Piping bodyConsists of a tube member formed of a resin material,
The fuel distribution means is formed of a resin materialThe fuel distribution
Consists of a small-diameter tube member inserted into the tube bodyIAnd
You.

[0021]

According to the first aspect of the present invention , the fuel supplied from the fuel inlet into the fuel pipe main body, which is a single pipe, is connected to the fuel inlet and each of the injection valve mounting ports respectively. After flowing through a plurality of individually communicating fuel passages, the fuel is injected outside (for example, in each cylinder of the engine) from each injection valve attached to each injection valve attachment port. At this time, the fuel passage, the fuel distribution means provided in the fuel pipe body, since its passage length is configured to be substantially equal to each other, across the fuel inlet to the injection valve mounting hole The length of each flow path of the flowing fuel can be made substantially constant, and the temperature of the fuel injected from each injection valve can be equalized.

According to the second aspect of the present invention, the fuel supplied from the fuel inlet into the fuel pipe main body flows through the insertion pipe provided in the fuel pipe main body, and flows through the plurality of injection valve mounting ports. Since the fuel is distributed from the fuel distribution ports that open at substantially equal positions to the respective injection valve mounting ports, the length of each flow path of the fuel flowing from the fuel inlet to each of the injection valve mounting ports is substantially constant. can do.

According to the third aspect of the present invention, the fuel supplied from the fuel inlet into the fuel pipe main body flows through the inner pipe forming the first passage, and the fuel provided in the inner pipe is provided. The fuel is guided from the distribution port to each of the injection valve mounting ports via a space between the fuel pipe main body and the inner pipe, which forms the second passage. At this time, since the length of the fuel passage formed by the first and second passage portions is configured to be substantially equal for each of the injection valve mounting ports, each of the fuel flowing from the fuel inflow port to each of the injection valve mounting ports is provided. The flow path length can be equalized.

Further, according to the fourth aspect of the invention, the pulsation of the fuel supplied from the fuel inlet into the fuel pipe main body can be suppressed by providing the pulsation suppressing means near the fuel inlet in the fuel pipe main body. Therefore, the pressure of the fuel supplied to each injection valve through each fuel passage can be smoothed.

Furthermore, according to the fifth aspect of the present invention, since the fuel pipe main body and the fuel distribution means are formed of a resin material, it is possible to prevent the fuel from becoming high temperature while flowing through the fuel pipe main body. Can be.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the embodiment, the same components as those of the conventional technique shown in FIG. 9 described above are denoted by the same reference numerals, and description thereof will be omitted.

First, FIGS. 1 to 6 show a first embodiment of the present invention.

In FIG. 1, reference numeral 11 denotes a fuel piping device according to the present embodiment, which is connected to a supply pipe 6 via a fuel filter 7 and a pressure regulator 8.
A fuel pipe main body 13 having a square tubular shape having a fuel inlet 12 protruding at a central portion thereof, and four fuel injection ports provided apart from each other in the longitudinal direction of the fuel pipe main body 13 and opened inside the fuel pipe main body 13. It is generally constituted by valve mounting ports 14A, 14B, 14C, 14D. The fuel pipe main body 13
The respective injection valves 4 disposed in the respective cylinders (four cylinders) of the engine 5 are integrally mounted on the respective injection valve mounting ports 14A to 14D.

[0029] Here, the fuel pipe body 13, for example, polyamide resin, polyphenylene sulfide, a resin material excellent in heat insulating properties, such as polyphthalamide, Figures 1
As shown in FIG. 3, it is formed as a pipe member composed of a single pipe , and prevents the fuel flowing through the fuel pipe main body 13 from becoming a high temperature state due to heat from the engine 5.

Reference numeral 15 denotes a damper mounting portion provided near the fuel inlet 12 and provided at the center of the fuel pipe main body 13. The damper mounting portion 15 divides the inside of the fuel pipe main body 13 into a left and right pair. A large-diameter cylindrical body 16 defined in the accommodation spaces 13A, 13A, and a small-diameter cylindrical body 17 provided concentrically on the inner peripheral side of the large-diameter cylindrical body 16 are provided.

Here, as shown in FIGS. 4 to 6, an annular space 18 is provided between the large-diameter cylindrical body 16 and the small-diameter cylindrical body 17.
On the inner peripheral side of the small-diameter cylindrical body 17, a fuel introduction chamber 19 into which a fuel introduction port 20A of a fuel damper 20, which will be described later, is inserted is formed. The fuel inlet 12 is opened in the annular space 18, and the annular space 18 and the fuel introduction chamber 19 communicate with each other via the fuel introduction port 20A. The large-diameter cylindrical body 16 and the small-diameter cylindrical body 17 are respectively provided with through-holes 16A, 16A and through-holes 17A, 17A penetrating in the radial direction along the longitudinal direction of the fuel pipe main body 13. Each of the through holes 16A and each of the through holes 17A are adapted to support a proximal end side of an insertion tube 21 or 21 described later.

Numeral 20 denotes a fuel damper mounted on the damper mounting portion 15 as pulsation suppressing means.
Is provided with a diaphragm (both not shown) constantly urged toward the annular space 18 by a spring, and deforms the diaphragm in response to the pulsation of the fuel introduced into the annular space 18, and FIG. As shown by an arrow in FIG. 3, the fuel is circulated from the upper end side to the lower end side of the fuel introduction port 20A and is introduced into the fuel introduction chamber 19, thereby suppressing pulsation of the fuel.

Numerals 21 and 21 denote internal pipes as fuel distribution means provided in the accommodating spaces 13A and 13A of the fuel pipe main body 13, respectively. Through hole 16A and through hole 1 of small diameter cylindrical body 17
7A, and is supported by the fuel pipe body 13 at the tip end.
Are supported by seal holders 22, 22 disposed in the respective accommodation spaces 13A at both ends. Each of the intubation tubes 21 has a base end opening to the fuel introduction chamber 19 and a tip end closed by each seal holder 22.

Here, each intubation tube 21 is connected to the fuel pipe body 13.
Similarly to the above, for example, a resin material having excellent heat insulating properties such as polyamide resin, polyphenylene sulfide, and polyphthalamide, or a metal material such as an aluminum pipe is used as the fuel.
As a pipe member smaller in diameter than the feed pipe main body 13, as shown in FIG.
This prevents the fuel flowing through each of the insertion tubes 21 from becoming high temperature due to heat from the engine 5.

Numerals 21A and 21A denote fuel distribution ports formed in the axially intermediate portions of the respective intubation tubes 21.
As shown in FIG. 3, the distance l from the fuel inlet 12 is L, and the distance l from each of the injection valve mounting ports 14A, 14B and each of the injection valve mounting ports 14C, 14D is equal to the value l. Is set to Then, the fuel introduced from the fuel inlet 12 into the fuel pipe main body 13 flows through the first passage portions 23 formed in the respective inner pipes 21, and flows through the fuel distribution ports 21A of the respective inner pipes 21. The fuel injection valve is guided to each of the injection valve mounting ports 14A to 14D via a second passage portion 24 formed between the pipe main body 13 and each of the inner insertion tubes 21.

Accordingly, as shown by the two-dot chain line arrows in FIGS.
Four fuel passages F1, F2, F3, and F4 for individually communicating the fuel injection valve 2 with the respective injection valve mounting ports 14A to 14D are formed.

Then, the fuel distribution port 21A of each intubation tube 21
Is the distance from the fuel inlet 12 to L, and
Since the holes are formed at positions where the separation distance from each of the injection valve mounting ports 14A to 14D is 1, four fuel passages F1 to F4 from the fuel inlet 12 to each of the injection valve mounting ports 14A to 14D are provided.
F4 is substantially equal length (L + 1) by each intubation 21
Has been distributed to.

In this embodiment, the fuel is discharged from the fuel pump 2 to the supply pipe 6 and supplied to the fuel pipe device 11 through the fuel filter 7 and the pressure regulator 8. As shown by arrows in FIGS. 4 and 5, the fuel is introduced from the fuel inlet 12 of the fuel pipe main body 13 into the fuel introduction chamber 19.

At this time, the pulsation of the fuel introduced into the fuel introduction chamber 19 is suppressed by the damping action of the fuel damper 20, and the smoothed fuel is introduced into each of the insertion pipes 21 opened to the fuel introduction chamber 19. .

The first tube formed in each intubation tube 21
The fuel that has flowed through the passage portion 23 is guided from the fuel distribution port 21A into the second passage portion 24, and is connected to each of the injection valve attachment ports 14A to 14A.
14D, the fuel is injected into each cylinder of the engine 5 from each injection valve 4 attached to each of the injection valve mounting ports 14A to 14D.

At this time, four fuel passages F1 to F4 extending from the fuel inlet 12 to the respective injection valve mounting ports 14A to 14D are provided.
Are distributed to substantially equal lengths by respective insertion tubes 21 provided in the fuel pipe main body 13. Therefore, of the fuels flowing through the fuel passages F1 to F4, only the fuel flowing through the specific fuel passage can be prevented from being brought to a high temperature state by the heat from the engine 5, and the fuel injected from each of the injection valves 4 can be prevented from becoming hot. Can be reduced. As a result, the air-fuel ratio in each cylinder of the engine 5 corresponding to each injection valve 4 can be equalized, and the air-fuel ratio control for the engine 5 can be performed with high accuracy.

Further, since the fuel pipe main body 13 and each of the inner pipes 21 are formed of a resin material having excellent heat insulating properties, the fuel flowing through the fuel pipe device 11 is heated to a high temperature state by the heat from the engine 5 and vaporized. And the air-fuel ratio in each cylinder of the engine 5 corresponding to each injection valve 4 can be effectively prevented from becoming lean.

FIGS. 7 and 8 show a second embodiment of the present invention.
Is shown. In this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals.
The description is omitted.

In the figure, reference numeral 31 denotes a fuel piping device according to the present embodiment. The fuel piping device 31 includes a pair of fuel piping main bodies 3 connected to a supply piping 6 via a T-shaped joint 32.
3 and 33, for example, which are integrally attached to six fuel injection valves (none of which are shown) respectively arranged in each cylinder of the opposed six-cylinder engine.

Since each of the fuel pipe main bodies 33 has the same structure, one of the fuel pipe main bodies 33 will be described below.
, And the description of the other fuel pipe main body 33 will be omitted.

Reference numeral 33 denotes a fuel pipe main body. The fuel pipe main body 33 is formed as a rectangular cylindrical body having a fuel inlet 34 protruding from the center thereof, and is spaced apart from the fuel pipe main body 33 at a uniform interval T in the longitudinal direction. Injection valve mounting ports 35A, 35B, 35C
Is provided. The fuel pipe main body 33 is formed of a resin material having excellent heat insulating properties, such as polyamide resin, polyphenylene sulfide, and polyphthalamide, and is provided at each of the injection valve mounting ports 35A to 35C in each cylinder of the engine. The respective injection valves (all not shown) are integrally mounted.

Numeral 36 designates a damper mounting portion provided near the fuel inlet 34 and immediately above the injection valve mounting port 35B. The damper mounting portion 36 moves the inside of the fuel pipe main body 33 to the left and right. It has a large-diameter cylindrical body 37 defined in the two spaces 33A and 33B, and a small-diameter cylindrical body 38 provided concentrically on the inner peripheral side of the large-diameter cylindrical body 37. And space 33A
The injection valve mounting ports 35A and 35B are opened in the space 33B.
Is provided with an injection valve mounting port 35C.

Reference numeral 39 denotes a fuel introduction chamber which is located on the inner peripheral side of the small-diameter cylindrical body 38 and in which the fuel introduction port 20A of the fuel damper 20 is inserted. I have. The fuel introduction chamber 39 and the space 33A of the fuel pipe main body 33 communicate with each other via an insertion tube 40 described later, and the fuel introduction chamber 39 and the space 33B of the fuel pipe main body 33 are formed in the large-diameter cylindrical body 37. It communicates via the provided communication hole 37A.

Numeral 40 designates an inner tube as a fuel distribution means disposed in the space 33A of the fuel pipe main body 33. The inner pipe 40 is made of, for example, polyamide resin, polyphenylene sulfide, polyphthalate, like the fuel pipe main body 33. It is made of a resin material having excellent heat insulation such as amide or a metal material such as an aluminum pipe. And intubation 4
0 is a through hole 37B formed in the large-diameter cylindrical body 37.
And is open to the fuel introduction chamber 39. The distal end side of the inner tube 40 is supported and closed by the seal holder 22 disposed in the space 33A of the fuel pipe main body 33.

Numeral 40A denotes a fuel distribution port formed at an intermediate portion in the axial direction of the insertion tube 40, and each fuel distribution port 40A has a distance of T / 2 from the fuel inlet 34 as shown in FIG. Further, the distance from each of the injection valve mounting ports 35A and 35B is set to T / 2.

Here, the fuel damper 2
First, the fuel introduced into the fuel introduction chamber 39 through the fuel introduction port 20A is guided to the injection valve mounting port 35C through the communication hole 37A of the large-diameter cylindrical body 37,
It is distributed to those introduced in 0. Then, the fuel introduced into the inner tube 40 flows through the first passage portion 41 formed in the inner tube 40, and then flows from the fuel distribution port 40A to the space between the fuel pipe main body 33 and the inner tube 40. The injection valve mounting ports 35A, 35
It is led to B.

Accordingly, as shown by the two-dot chain line arrows in FIG. 8, three fuel passages F1 for individually communicating the fuel inlet 34 with the respective injector mounting ports 35A to 35C are provided in the fuel pipe main body 33. ', F2', F3 '.

Here, the fuel distribution port 40A of the insertion tube 40
Is a distance between the injection valve mounting ports 35A and 35B, that is, the distance between the fuel inlet 34 and the injection valve mounting port 35B is T / 2, and the distance between each of the injection valve mounting ports 35A is T. / 2. Therefore,
The three fuel passages F1 'to F3' extending from the fuel inlet port 34 to the respective injection valve mounting ports 35A to 35C are distributed by the insertion tube 40 into substantially equal lengths T.

In this embodiment constructed as described above, the fuel inlet 3 is substantially the same as in the first embodiment.
The three fuel passages F1 'to F3', which extend from the fuel injection valve 4 to the respective injection valve mounting ports 35A to 35C, are distributed by the insertion pipes 40 provided in the fuel pipe main body 33 to have substantially the same length. Therefore, of the fuel flowing through each of the fuel passages F1 'to F3', only the fuel flowing through the specific fuel passage can be prevented from becoming high temperature due to the heat from the engine 5, and the fuel injected from each injection valve 4 can be prevented. The mutual temperature difference can be reduced. As a result, the engine 5 corresponding to each injection valve 4
The air-fuel ratio in each cylinder can be equalized, and the air-fuel ratio control for the engine 5 can be performed with high accuracy.

In the above-described second embodiment, the case where the fuel damper 20 as the pulsation suppressing means is attached to each of the pair of fuel pipe main bodies 33 constituting the fuel pipe device 31 has been described as an example. The present invention is not limited to this. For example, by providing one fuel damper 20 at the T-shaped joint 32 interposed between the fuel pipe main bodies 33, the fuel is supplied from the T-shaped joint 32 to each fuel pipe main body 33. May be suppressed.

Further, in each of the above embodiments, the fuel piping device 11 in which four injection valves are integrally mounted and the fuel piping device 31 in which six injection valves are integrally mounted have been described as examples. However, the present invention is not limited to this, and can be widely applied to a multi-cylinder engine provided with a plurality of injection valves.

Further, in each of the above embodiments, the fuel damper 2
0 is provided in the fuel pipe main body 13 (33) in the vicinity of the fuel inlet 12 (34), but the present invention is not limited to this, and the fuel filter 7 and the pressure regulator 8 and the supply pipe 6, or may be provided integrally with the fuel pump 2.

[0058]

As described above in detail, according to the first aspect of the present invention, the fuel distribution means is provided in the fuel pipe main body composed of a single pipe, so that the fuel pipe can reach from the fuel inlet to each of the injection valve mounting ports. a plurality of fuel passages, the length of their is configured to be substantially equal to each other, it is possible to each flow path length of the fuel flowing through to the injector mounting hole from the fuel inlet and substantially constant, The temperature of the fuel injected from each injector can be equalized. As a result, for example, the air-fuel ratio control of the engine can be performed with high accuracy.

According to the second aspect of the present invention, the fuel introduced from the fuel inlet into the inner tube is inserted into each of the injection valves through the distribution ports which are opened at substantially equal positions with respect to the plurality of injection valve mounting ports. Since it is configured to be distributed toward the mounting port, each flow path length of the fuel flowing from the fuel inlet to each of the injection valve mounting ports can be made substantially constant, and the fuel is injected from each of the injection valves. The temperature of the fuel can be equalized.

According to the third aspect of the present invention, the fuel supplied from the fuel inlet into the fuel pipe main body flows through the inner pipe forming the first passage, and is then provided in the inner pipe. the fuel <br/> dispensing port, through the space between the fuel pipe body and inner intubation forming the second passage portion is configured to be guided to the injection valve mounting hole, the first of these, the second Fuel passage consisting of a passage section
And since the passage length is approximately equal configuration for each injector mounting hole, it is possible to each flow-channel length of the fuel flowing up the injector mounting hole from the fuel inlet substantially constant Thus, the temperature of the fuel injected from each injection valve can be equalized.

Further, according to the invention of claim 4, a pulsation suppressing means is provided near the fuel inlet in the fuel pipe main body to suppress pulsation of fuel supplied from the fuel inlet into the fuel pipe main body. Therefore, the pressure of the fuel supplied to each injector through each fuel passage can be smoothed, and the fuel injection amount for each injector can be equalized.

Further, according to the fifth aspect of the present invention, since the fuel pipe main body and the fuel distribution means are formed of a resin material, the heat insulating property of the resin material causes a high temperature state while the fuel flows through each fuel passage. Can be suppressed. As a result, for example, it is possible to prevent the fuel injected into each cylinder of the engine from evaporating to make the air-fuel ratio lean, and to control the air-fuel ratio of the engine with high accuracy.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an entire fuel injection device to which a fuel piping device according to a first embodiment of the present invention is applied.

FIG. 2 is a plan view of the fuel piping device in FIG.

FIG. 3 is a cross-sectional view as viewed from a direction indicated by arrows III-III in FIG. 2;

FIG. 4 is a cross-sectional view as seen from the direction of arrows IV-IV in FIG. 3;

FIG. 5 is an enlarged sectional view showing each fuel passage formed in a fuel pipe main body located on the left side in FIG. 3;

FIG. 6 is an enlarged sectional view showing each fuel passage formed in a fuel pipe main body located on the right side in FIG. 3;

FIG. 7 is a plan view of a fuel piping device according to a second embodiment of the present invention.

8 is a cross-sectional view as seen from the direction of arrows VIII-VIII in FIG. 7;

FIG. 9 is a configuration diagram showing an entire fuel injection device to which a fuel pipe device according to a conventional technique is applied.

[Explanation of symbols]

 11, 31 Fuel piping device 12, 34 Fuel inlet 13, 33 Fuel piping main body 14A to 14D, 35A to 35C Injection valve mounting port 20 Fuel damper (pulsation suppressing means) 21, 40 Inner pipe 21A, 40A Fuel distribution port 23, 41 first passage portion 24, 42 second passage portion F1 to F4, F1 'to F3' fuel passage

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ identification code FI F02M 55/02 340 F02M 55/02 340A (58) Field surveyed (Int.Cl. ⁷ , DB name) F02M 55/02

Claims (5)

(57) [Claims] 1. A fuel inlet having a fuel inlet and flowing from the fuel inlet.
A fuel pipe body has fuel flowing inside, provided to the fuel pipe body for mounting the fuel injection valve, respectively, a fuel delivery apparatus comprising a fuel pipe plurality of injection valves installation opening spaced from each other in the longitudinal direction of the body In the fuel pipe main body, the fuel inlet is located at a central portion in a longitudinal direction.
Constituted by a single pipe provided in the interior of the fuel pipe body, provided fuel distribution means for forming a plurality of fuel passages communicating individually with said fuel inlet and the injection valve mounting hole respectively , each fuel path formed by said fuel distribution means
A fuel piping device wherein the passage lengths are substantially equal to each other. 2. The fuel distribution means comprises an insertion tube provided in the fuel pipe main body, wherein the insertion tube is provided with a fuel distribution port which opens at a position substantially equal to the plurality of injection valve mounting ports. The fuel piping device according to claim 1, wherein: 3. The fuel distribution means includes: an insertion pipe extending in the fuel pipe main body in the axial direction; and an axially intermediate portion of the insertion pipe in the plurality of injection valve mounting ports. consist of a fuel delivery port formed in a position approximately equal for a pre-Symbol the intubation is a first passage portion, when the space between the fuel pipe body and inner intubation and a second passage portion to, said
The first and second passages communicate with each other via the fuel distribution port.
And, first, the length of the fuel passage and a second passage portion fuel pipe device according to claim 1 comprising a substantially equal configuration before each <br/> SL each injector mounting hole. The method according to claim 4, wherein the fuel pipe body, the pulsation suppression means for suppressing the pulsation of the fuel located in the vicinity of the fuel inlet
The fuel delivery apparatus of claim 1, 2 or 3 set only comprising. 5. The fuel pipe body is formed of a resin material.
It consists been tubular member, a small diameter tube wherein the fuel distribution means is inserted into is formed of a resin material wherein the fuel pipe body
The fuel piping device according to claim 1, 2, 3, or 4, which is constituted by members .