JPH0439406Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to fuel piping for supplying fuel to the fuel injection valves of a fuel-injected V-type multi-cylinder engine. This invention relates to fuel piping for a fuel injection type V-type multi-cylinder engine in which a pair of fuel pipes provided along each cylinder row are formed as one continuous passage.

(Prior Art) In a fuel-injected multi-cylinder engine, generally,
A fuel injection valve is provided for each cylinder.
The upper ends of the injection valves are connected to a common fuel pipe, and the fuel pumped from the fuel pipe is distributed to each injection valve.

Such fuel injection valves are typically mounted near the combustion chamber of each cylinder, such as on a mounting flange to the cylinder head of the intake manifold. Therefore, the fuel pipe that supplies fuel to the fuel injection valve is also arranged near the cylinder head.

In the case of a V-type multi-cylinder engine, a pair of cylinder rows are arranged in a V-shape, so that the cylinder heads of each cylinder row are spaced apart from each other. For this reason, fuel pipes of the fuel injection type V-type multi-cylinder engine must be provided for each cylinder row. In that case, it may be possible to make each fuel pipe independent, but in that case, it would be necessary to provide each fuel supply system with an independent control device such as a fuel pressure adjustment valve, and it would also be necessary to bleed air in the pipes. etc. will also need to be done separately. Therefore, in such a case,
Each fuel pipe is connected in series with a connecting pipe, and 1
I tried to create a continuous passage of books.

By the way, in the case of a V-type multi-cylinder engine for an automobile, various devices are also installed in the space between the cylinder rows in order to minimize the occupied space. For example, an alternating current generator, a power steering pump, etc. are arranged on one end surface side. Therefore, when connecting a pair of fuel pipes provided along each cylinder row with a connecting pipe as described above, it is difficult to connect the connecting pipe to one end of the fuel pipe. Become.

For this reason, the present applicant proposed a structure in which one fuel pipe extends from a connection port provided at one end to the other end, and is folded upward from that end to extend to a connection port in the center. A V-type fuel injection type having a double passage, with a fuel supply pipe connected to the connection port at one end, and a connection pipe to the other fuel pipe connected to the connection port at the center. Developed a fuel piping structure for multi-cylinder engines (Utility Application No. 160954, 1983).

In this fuel piping structure, the fuel pipe is located between the intake manifold and the cylinder head, which are arranged in the space between the cylinder rows, and there is not enough space on both sides, so the fuel supply pipe and connecting pipe are A connection port is formed on the upper surface, and the pipes are connected from the upper surface side. The connecting pipe is connected to the other fuel pipe through the upper part of the intake manifold.

(Problem that the invention attempts to solve) However, if the connection port is provided on the top surface of the fuel pipe, the fuel pipe will have double passages on the upper and lower sides. In addition to being large in height, the connecting pipe is connected to the top surface of the cylinder head cover, so the joint for connecting the connecting pipe protrudes above the cylinder head cover. The overall height of the engine becomes higher.

Furthermore, in fuel-injected engines, by increasing the length of the intake pipe, the output in the low rotation range of the engine is often improved by utilizing the intake inertia effect. In such cases, the intake manifold becomes a large body that may protrude upwardly from between the cylinder rows of the V-engine. Therefore,
If a connecting pipe connecting the fuel pipes on both sides is arranged above such an intake manifold, the overall height of the engine becomes even higher.

In the case of an automobile engine, when the total height of the engine increases in this way, the bonnet line is restricted, and the degree of freedom in designing the vehicle body is reduced.

Furthermore, the area around the fuel pipe connection port needs to be finished to ensure a seal between the connected pipe and the connection port needs to be threaded. In the case where connection ports are provided on the upper surface of one end portion and the center portion, the connection ports are separated from each other and their heights are also different, making such processing complicated.

The present invention was developed in view of these problems, and its main purpose is to easily install piping for the fuel supply system in a fuel-injected V-type multi-cylinder engine without increasing the overall height of the engine. The aim is to make sure that the

Another object of the present invention is to facilitate the processing of the fuel pipe used for the fuel piping.

(Means for solving the problem) In order to achieve this object, in the present invention, one of the fuel pipes provided along each cylinder row of the V-type multi-cylinder engine has a pair of upper and lower passages. , one end of each of the passages opens to one end surface of the fuel pipe, and the other end of each passage communicates with each other at the other end of the fuel pipe. A fuel supply pipe for guiding fuel supplied from the fuel pipe is connected to one of the openings, and a connecting pipe for guiding fuel to the other fuel pipe is connected to the other opening.

(Function) With this configuration, both the fuel supply pipe and the connecting pipe are connected to one end surface of the fuel pipe, so the joint for connecting them does not protrude above the fuel pipe. It disappears. Further, since the connection port is arranged in parallel with one end surface of the fuel pipe, it is easy to finish the plane around the connection port and process threads.

By connecting the connecting pipe to one end surface of the fuel pipe in this way, the connecting pipe is arranged along one end of the space between the cylinder rows and connected to the other fuel pipe. be able to.
Therefore, even if a large intake manifold is provided in the space between the cylinder rows, there is no need to pass the intake manifold above the intake manifold, and an increase in the overall height of the engine can be prevented.

(Example) Hereinafter, an example of the present invention will be described using the drawings.

In the figure, Figures 1 and 2 show an embodiment of the fuel piping according to the present invention. Figure 1 is a cutaway front view of an engine equipped with the fuel piping, and Figure 2 is a plan view thereof. be. Moreover, FIG. 3 is a longitudinal sectional view of a fuel pipe used for the fuel piping.

As is clear from FIGS. 1 and 2, this engine 1 is a V-type six-cylinder engine, and a pair of cylinder rows 2 and 3 arranged in a V-shape each have three cylinders arranged in the axial direction of the crankshaft 4. Cylinders 5 are arranged in parallel. The engine 1 is mounted at the front of an automobile, with the crankshaft 4 extending in the width direction of the vehicle body, and the left side in the figure being at the front of the vehicle body. In the space 6 between the cylinder rows 2 and 3, an alternating current generator 7 and a power steering pump 8 are arranged on one end surface thereof.

Cylinder heads 9, 10 of each cylinder row 2, 3
Inside, one end is connected to the combustion chamber 1 of each cylinder 5.
An intake port 12 and an exhaust port 13 that are open to the exhaust port 1 are provided. The intake port 12 and exhaust port 13 are opened and closed by an intake valve 14 and an exhaust valve 15, respectively. The inlet of the intake port 12 opens on the side upper surface of the cylinder heads 9, 10 located on the side of the space 6 between the cylinder rows 2, 3. Further, the outlet of the exhaust port 13 is open to the other side of the cylinder heads 9 and 10.

An intake manifold 16 is disposed in the space 6 between the cylinder rows 2 and 3. The intake manifold 16 includes one flat distribution chamber 17, six intake pipes 18, 18 extending from both sides of the upper surface of the distribution chamber 17 and connected to the intake port 12 of each cylinder 5. ..., and the distribution chamber 17 has cylinder rows 2 and 3.
It is arranged at the bottom of the space 6 between them.

Inlet pipe 18 extending from distribution chamber 17
stands up almost vertically, curves gently at a position slightly higher than the cylinder head covers 19, 20, and extends diagonally downward toward the cylinder row 2 or 3 on the far side. Each intake pipe 18
The inside of the vertical portion is divided by a partition wall 21 into an inner large-diameter passage 22 and an outer small-diameter passage 23.
Furthermore, the inside of the distribution chamber 17 is also divided into an inner chamber 25 and an outer chamber 26 by a partition wall 24 . The inner chamber 25 is connected to the large diameter passage 22 of the intake pipe 18, and the outer chamber 26 is connected to the small diameter passage 22.
It is designed to be connected to 3.

Thus, a short, large diameter passage 27 and a long, small diameter passage 28 are formed in the intake manifold 16 from the distribution chamber 17 to each cylinder head 9,10. The long and small-diameter passage 28 is set to a length that is sufficient for the intake inertia effect to work in the low rotation range of the engine 1.
The short, large-diameter passage 27 is opened and closed by an on-off valve 29 that operates according to the rotational speed of the engine 1.

On the other hand, the ends of the three intake pipes 18 extending toward the cylinder row 2 are fixed to the cylinder head 9 by a common mounting flange 30, so that each intake pipe 18 is connected to the corresponding intake port 12. The cylinder 5 is connected to the combustion chamber 11 of the corresponding cylinder 5 through the cylinder 5. The ends of the three intake pipes 18 extending toward the other cylinder row 3 are also connected to the cylinder head 10 by a common mounting flange 31.
and are connected to the combustion chambers 11 of the respective cylinders 5.

Fuel injection valves 32 and 33 that inject fuel into the intake ports 12 corresponding to each cylinder 5 of each cylinder row 2 and 3 are mounted on these mounting flanges 30 and 31, respectively. The upper end of the combustion injection valve 32 on one side of the cylinder row 2 is connected to the first fuel pipe 34 . Further, the fuel injection valve 33 on the other side of the cylinder row 3 has its upper end connected to the second fuel pipe 35. These first and second fuel pipes 34 and 35 extend along the side surfaces of the cylinder head covers 19 and 20 of each cylinder row 2 and 3, respectively, and their tips are connected to the alternator 7 and the power steering pump 8, respectively. Located nearby.

As is clear from FIG. 3, the first fuel pipe 34 is provided with a pair of upper and lower passages 36 and 37. These passages 36 and 37 are connected to the fuel pipe 34
The openings are formed as connection ports 38 and 39 each having a threaded portion.
The other ends of the passages 36 and 37 are closed, and communicated with each other through a vertical hole 40 bored from the lower surface of the fuel pipe 34. A fuel injection valve 32 is located at the lower end of the vertical hole 40.
The upper ends of the two are fitted together. Further, vertical holes 41 and 42 are formed on the lower surface side of the fuel pipe 34 and communicate with the lower passage 37 and into which the other two fuel injection valves 32 are fitted.

This first fuel pipe 34 has connection ports 38, 3
The end face where 9 is formed is on the opposite side from the alternator 7,
That is, it is arranged so as to face the throttle body 43 attached to the distribution chamber 17. This part of the space 6 between the cylinder rows 2, 3 is relatively free. A fuel supply pipe 44 is connected to the lower connection port 39 through which fuel is pumped from the fuel tank by a fuel pump (not shown).
are connected via a joint 45. Further, at the upper connection port 38, a connecting pipe 46 that supplies fuel to the second fuel pipe 35 is connected.
They are connected via a joint 47.

The second fuel pipe 35 is a normal one having a single passage, and a connecting pipe 46 is connected to one end thereof, for example, the end on the power steering pump 8 side, through a joint 48 from the upper surface side. It is becoming more and more like this. In that case, the connecting pipe 46
is arranged so as to extend from the connection port 38 of the first fuel pipe 34 through the side of the intake manifold 16 and above the second fuel pipe 35, that is, to bypass the intake manifold 16. A fuel pressure regulating valve 49 is provided at the other end of the second fuel pipe 35, so that the fuel pressure within the fuel pipes 34, 35 is controlled within a predetermined range. Excess fuel is then returned to the fuel tank through a return pipe 50.

In this way, the first and second fuel pipes 34, 3
5 is one passage connecting the fuel supply pipe 44 and the return pipe 50.

Next, the operation of the fuel pipe configured in this way will be explained.

When the engine 1 is in operation, the air taken in through the air cleaner is metered in the throttle body 43 and then guided into the distribution chamber 17 of the intake manifold 16 through six intake pipes 18, 1.
8. Evenly distributed among... The air is then guided to the intake port 12 of the corresponding cylinder 5.

When the engine 1 rotates, the fuel pump is driven and fuel is pumped through the fuel supply pipe 44.
The fuel flows into the lower passage 37 from both sides of one end of the first fuel pipe 34 and is distributed to each fuel injection valve 32 . The remaining fuel is guided to the upper passage 36 through the vertical hole 40 on the other end side, turned around, and guided from the one end side of the fuel pipe 34 to the connecting pipe 46 . The fuel then flows into the second fuel pipe 35 through the connecting pipe 46, is distributed to each fuel injection valve 33, and then guided to the fuel pressure regulating valve 49.

In this way, the pressure within the pair of fuel pipes 34 and 35 is controlled by one fuel pressure regulating valve 49, and the fuel injection valves 32 and 33 are operated at appropriate times, thereby injecting fuel into the corresponding intake port 12. is injected. The injected fuel is transferred to the intake manifold 16
The mixture is mixed with air introduced from the combustion chamber 11, and flows into the combustion chamber 11 as an air-fuel mixture. This air-fuel mixture is combusted in the combustion chamber 11, thereby causing the engine 1 to exert driving force.

During this period, the on-off valve 29 is opened and closed depending on the operating state of the engine 1, and in the low rotation range, air flows through the long passage 28, thereby exerting an intake inertia effect. Further, in a high rotation range, air flows through the short and large diameter passage 27, thereby reducing the flow resistance. Therefore, the intake air filling efficiency is improved and high output can be obtained at all times.

Since two connection ports 38 and 39 are formed on one end surface of the first fuel pipe 34,
The connecting pipe 46 and the fuel supply pipe 44 will both be coupled to their end faces. Therefore, the joints 47 and 45 also only protrude laterally from one end surface of the first fuel pipe 34, and do not protrude upward. As a result, the first fuel pipe 3 including those joints 47 and 45
The fuel pipes around the fuel pipe 4 are now within the height range of the fuel pipe 34.

Thereby, as shown in Figure 1,
The fuel pipe in that part is located below the plane connecting the top of the cover 51 of the intake manifold 16 and the top of the cylinder head cover 19, making it possible to set the bonnet line 52 low. In addition, the first fuel pipe 34 and the second
Since the connecting pipe 46 that connects the fuel pipe 35 to the fuel pipe 35 can be routed so as to bypass the intake manifold 16, the overall height of the engine 1 can also be prevented from increasing. Therefore, the degree of freedom in designing the bonnet line 52 is increased.

Further, the connection ports 38 and 39 to which the connecting pipe 46 and the fuel supply pipe 44 are connected are connected to the first fuel pipe 34.
Since the connecting ports 38 and 39 are formed adjacent to one end surface of the connecting ports 38 and 39, the flat finishing and threading around the connecting ports 38 and 39 only need to be performed on one surface, which facilitates the processing. Furthermore, such a fuel pipe 34 is usually formed by die-casting aluminum, and the upper and lower passages 36 and 37 are formed by using a core, but in this way, one end is formed with an opening. The fuel pipe 34 having holes extending parallel to each other is extremely easy to form, and the mold can be made simple.

In the above embodiment, the connecting pipe 46 is connected to the end of the second fuel pipe 35 on the power steering pump 8 side. It can also be connected to the side ends. and,
In that case, it is also possible to provide the connection port on the end face of the second fuel pipe 35. By connecting the connecting pipe 46 to the end of the second fuel pipe 35 on the side of the throttle body 43 in this way, the connecting pipe 46 can be made short. However, in that case, it is necessary to secure a space sufficient for arranging the fuel pressure regulating valve 49 at the end on the power steering pump 8 side.

(Effects of the invention) As is clear from the above description, according to the invention, one side of the fuel pipes arranged along each cylinder row of a V-type multi-cylinder engine can be connected to two upper and lower pipes that communicate with each other at one end. Each passage is opened at one end surface of the fuel pipe, and the fuel supply pipe and the connecting pipe are connected through the opening, so that the connection part is on one end side. This makes it possible to make the engine more compact. Furthermore, since the connecting portion does not protrude upward, the overall height of the engine can also be prevented from increasing. Furthermore, since the openings to which these tubes are connected are provided adjacent to each other, machining around the openings is also facilitated.

Then, the connecting pipe is connected to the other fuel pipe, so the pair of fuel pipes become one.
The connecting pipe can be easily formed as a continuous passage in series, and the connecting pipe can be placed at one end of the space between the cylinder rows, and the piping can be arranged so as not to interfere with other equipment. It becomes easier to do so.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the fuel piping according to the present invention, and is a partially cutaway schematic front view of an engine equipped with the fuel piping, FIG. 2 is a plan view of the engine, and FIG. , is a vertical cross-sectional view of a fuel pipe used for the fuel piping. 1... Engine, 2, 3... Cylinder row, 5...
...Cylinder, 6...Space between cylinder rows, 16...
...Intake manifold, 32, 33...Fuel injection valve,
34...first fuel pipe, 35...second fuel pipe, 36...upper passage, 37...lower passage,
38, 39... Connection port (opening), 44... Fuel supply pipe, 45... Joint, 46... Connecting pipe, 4
7...Joint, 48...Joint, 49...
...Fuel pressure adjustment valve.

Claims (1)

[Scope of Claim for Utility Model Registration] A fuel injection valve provided for each cylinder by a pair of fuel pipes, each provided corresponding to a pair of cylinder rows arranged in a V-shape, and extending along each cylinder row. In a fuel-injected V-type multi-cylinder engine configured to supply fuel to the fuel pipe, one of the fuel pipes has a pair of upper and lower passages, and each passage has one end surface of the fuel pipe. and a fuel supply pipe for guiding fuel supplied from a fuel pump is connected to one of the openings of the passage formed in one end surface of the fuel pipe, and the other end thereof communicates with each other. A fuel pipe for a fuel injection type V-type multi-cylinder engine, wherein the other opening is connected to a connecting pipe that leads fuel to the other side of the fuel pipe.