JP3457187B2 - Variable intake device for V-type multi-cylinder internal combustion engine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention
Wide rotation speed range from rotation speed range to high rotation speed range
V-type multi-cylinder with high volumetric efficiency
The present invention relates to improvement of a variable intake device for a fuel engine. 2. Description of the Related Art Fuel efficiency of an internal combustion engine for a vehicle or the like and improvement in operation
Reduction of internal combustion engine speed is required to reduce engine vibration
However, for that purpose, it is necessary to improve the torque during low-speed rotation.
In order to improve the torque during low-speed rotation,
The volumetric efficiency of the gas must be improved. [0003] Generally, the length and volume of the intake pipe of an internal combustion engine
The inertia supercharging effect of the intake air by changing
Combined use of fruit and resonance (pulsation) supercharging effects
From the low speed range to the high speed range.
Therefore, high volume efficiency is maintained. [0004] Even in a V-type multi-cylinder internal combustion engine, the rotational speed is low.
The intake manifold length of the intake manifold in the temperature range
A structure is desired. Also, generally, the intake manifold is
In the case of having a long switching structure, inertia supercharging effect in high speed range
In many cases.
A structure that has little adverse effect on the inertial supercharging effect is desired. Further, the length of the intake pipe from the intake sound source is unequal.
In order to reduce the rumbling noise caused by
It is desired that the pipe length of the intake pipe including the ditank be made equal. I
However, especially in the case of a V-type multi-cylinder internal combustion engine,
Clear between hood and hood
The structure must be able to secure a lance, and the shape of the intake pipe
There are few degrees of freedom. It is possible to satisfy the various demands as described above.
Variable intake system for V-type multi-cylinder internal combustion engine
As described in Japanese Patent Application Laid-Open No.
There is something. The one described in this publication is opposed to a V-shape.
Branch intake pipes communicating with the cylinders of the left and right banks
Cross each surge tank with a predetermined volume
Located above the pipes and connect each branch intake pipe to the surge tank.
With a J-shaped cross-section
Branch short-circuit path that short-circuits to each surge tank
And open each branch short-circuit path according to the operating conditions.
It has a branch control valve that opens and closes. In addition, each service
In the tank-to-tank communication passage that communicates the
It has a tank control valve that opens and closes according to the turning conditions. The one described in the above publication is constructed as described above.
The engine height is kept low, and each intake pipe length and
While ensuring sufficient tank capacity, the branch control valve and
And the tank control valve open and close appropriately according to the operating conditions of the engine
Controlling, supercharging effect based on inertia and resonance
A wide range from low to high engine speeds
High volume efficiency is maintained over the rotation speed range. [0009] The invention of the present application is based on the public
Compared with those described in the report
Higher over a wide rotation speed range up to the rotation speed range
Volume efficiency and higher output torque can be obtained
To provide a variable intake device for a V-type multi-cylinder internal combustion engine
Make it an issue. [0010] The invention of the present application
Is a V-type multi-cylinder internal combustion engine that has solved the above-mentioned problems.
The invention described in claim 1 relates to a variable intake device.
Is the ignition timing at which the left and right banks explode alternately and at equal intervals
And a completely symmetric intake manifold between the left and right banks.
Variable intake device of a V-type multi-cylinder internal combustion engine having a
The intake manifold has a pair of left and right slots.
A pair of left and right first chambers to which the torso body is connected
And the right and left banks with the pair of first chambers on the left and right.
Left and right to communicate directly with the intake port of each cylinder
Several pairs of first intake passages and the pair of left and right first channels.
The left and right bars are connected to the bar via a pair of left and right first communication paths.
Chambers are always in communication, and the left and right banks
A pair of left and right second chas positioned substantially in the center of the valley
The left and right pair of second chambers
A plurality of pairs of first intake passages, each of which communicates with a base end of the first intake passage;
Around the entire circumference of the pair of left and right second chambers.
Direction of the spiral formed integrally with the chamber of
A plurality of pairs of second intake passages wound right and left.
A plurality of pairs of second intake passages are formed of the left and right pairs of first intake passages.
From the part connected to the base end of the intake passage of
In the first pair of left and right first intake passages on the upstream side,
And a pair of left and right first chambers.
A first on-off valve for communicating or disconnecting the
A second communication path between the pair of left and right first communication paths.
A second opening for opening and closing the second communication passage is provided in the second communication passage.
A valve is provided, the first on-off valve and the second on-off valve
Can be switched according to the engine speed.
When the speed increases and reaches the middle rotation speed range, the first opening
The valve closes and the engine speed further increases, resulting in high engine speed.
When the speed range is reached, the second on-off valve is closed.
Variable intake of a V-type multi-cylinder internal combustion engine
It is an air device. The invention described in claim 1 is as described above.
The left and right vans of a V-type multi-cylinder internal combustion engine
Have ignition timings that explode alternately and at regular intervals,
Intake manifold located completely symmetrically between right bank
Left and right pair of first chambers and left and right pair of second chambers
The members are left and right through a pair of left and right first communication passages.
The chambers are always in communication with each other, and
These chambers are left in a pair of second chambers.
A spiral that communicates with the base end of the first pair of first intake passages
A plurality of pairs of second intake passages each having a right and left winding shape are formed by these channels.
It is formed integrally around the entire circumference of the chamber. In addition, a plurality of pairs of second intake passages of right and left windings are provided.
The roads are respectively connected to the base end portions of the left and right plural pairs of the first intake passages.
Left and right pairs of first intakes upstream of the point where they are connected
In the passage, a pair of left and right first intake passages is formed.
First to communicate or not to communicate with the chambers
Opening / closing valve is provided to communicate between the pair of left and right first communication passages.
Opening and closing the second communication passage in the second communication passage
A second on-off valve is provided. The first on-off valve has an engine rotation speed of
When the engine speed rises and reaches the middle speed range, it is released and the engine speed
The second on-off valve is closed while the degree is in the low rotational speed range.
Means that the engine speed further increases and reaches the high
And in the rotation speed range lower than the rotation speed
Is open. As a result, the engine is operated at a low speed including an extremely low rotational speed.
When in the rotation speed range, the first on-off valve is closed and the left
A pair of left and right first chambers of a plurality of right pairs of first intake passages
Communication between the left and right sides
Communication, so that the left and right sides
The road is divided using the first intake passage and the second intake passage.
And the intake passage length is extremely long
Can be removed, and the second on-off valve
Left and right by opening the second communication passage.
The first communication passages of the pair are communicated with each other, and the first intake passages are connected.
The passage and the second intake passage are formed of a pair of left and right first chambers.
Connect to all chambers with a pair of left and right second chambers
To form a single large volume inertial chamber
Will be able to These allow the engine
High inertia supercharging effect suitable for the speed range
Volume efficiency can be obtained, and it can be used in the low engine speed range.
Output torque can be improved. In addition,
Prevents interference of intake air supplied to each cylinder intake port
can do. Further, the first on-off valve increases the engine speed.
It will be released when it rises to reach the middle rotation speed range.
The left and right pairs of first intake passages are
The left and right sides are directly connected to the chamber, and the intake passage is
Use a plurality of pairs of left and right first intake passages to make them short.
And the intake passage length is minimized and flows through the intake passage
Inhalation efficiency can be increased by suppressing the flow resistance of intake air
High inertia suitable for the engine's mid-speed range.
Sexual supercharging effect and high volumetric efficiency
You. Further, the engine speed further increases and becomes higher.
When the rotation speed range is reached, the second on-off valve is closed.
The second communication path is closed, and a pair of left and right first communication paths is provided.
The left and right chambers are always in communication via
A pair of left and right first chambers and a pair of left and right
The two chambers are completely independent of each other.
Independent left and right chambers with no overlapping air stroke (ignition timing)
-Make up the system. This left and right chamber system is composed of left and right
Several pairs of first intake passages and multiple pairs of right and left-handed second pairs
Via the intake passage to the intake port of each cylinder in the right and left banks
The left chamber system is connected to the right bank
For the intake port of each cylinder,
Indicates the intake port for each cylinder in the left bank.
It functions as a resonance chamber as the atmospheric pressure equivalent part of the air passage
During the intake stroke in each of the left and right banks
Has a resonance (pulsation) effect on other cylinders,
High resonance efficiency and high volumetric efficiency
Wear. FIG. 1 to FIG. 10 show a preferred embodiment of the present invention.
One embodiment of the invention described in claim 1 of the present application
Will be described. FIG. 1 shows a variable intake device according to the present embodiment.
Schematic plan view of a V-type multi-cylinder internal combustion engine to which the arrangement is applied, FIG.
Is a cross-sectional view taken along line II-II in FIG. 1, and FIG.
FIG. 4 is a sectional view taken along the line II-III of FIG.
FIG. 5 is a cross-sectional view taken along the line arrow, and FIG.
FIG. 6 is an exploded perspective view of the manifold, and FIG. 6 is a left side of the intake manifold.
Schematic of the connection configuration of the half chamber and intake passage
FIG. 7 is an explanatory view showing the variable state of the intake manifold.
FIG. 8 is an explanatory view showing one operation state of the intake mechanism, and FIG.
FIG. 9 is an explanatory view showing an operation state, and FIG.
FIG. 10 is a characteristic diagram of the variable intake device of FIG.
is there. FIGS. 2 and 3 show the vehicle traveling direction.
Because it is a cross-sectional view drawn from the front to the rear,
The left and right in the row direction are opposite in these figures.
To be. Therefore, for example, left and right banks 4
l and 4r are respectively shown on the right and left of the figure in these figures.
Is drawn. Hereinafter, unless otherwise specified, "Left
“Right” means left and right as viewed in the vehicle traveling direction. FIGS. 1 to 4 show the present embodiment.
V-cylinder internal combustion engine 1 to which a variable intake device is applied
Is a vertical V-type 8-cylinder internal combustion engine,
Mounted on the front part, inside the V-shaped cylinder block 5
Is a flat crank (not shown) (180-degree crank).
Rank) is accommodated, and the vehicle travels in the cylinder block 5
Left and right cylinder heads 6l, 6r,
Left and right cylinder head covers 7l, 7r
An oil pan 8 is provided below the cylinder block 5.
The left and right banks 4l, 4r are attached together.
Main body 2 of a V-type 8-cylinder internal combustion engine
You. Left and right banks 4l, 4r explode alternately and at equal intervals
Between the two banks 4l and 4r
Is provided with the intake manifold 3 accommodated therein. The intake manifold 3 is independent for each of the left and right
Left and right intake systems 3l, 3r, as described later,
Four separate parts are assembled together and are completely symmetrical
(However, the phase is slightly shifted in the vehicle traveling direction.
You. ). Left and right intake systems 3 constituting intake manifold 3
l and 3r are the intake ports of each cylinder of the right and left banks 4r and 4l.
To 11r and 11l (see FIG. 2; 11l is not shown).
Each supplies intake air. The intake manifold 3 will be described later
As shown in the figure, variable intake (tube length switching, resonance switching) means
ing. Although not shown, the left and right exhaust manifolds are not shown.
The field is also completely symmetrical. Left and right intake systems 3l, 3r of intake manifold 3
And the right and left banks 4l, 4r are shown in FIGS.
Is drawn on the same side as left and right, but left and right intake systems 3l, 3
r each intake air flowing in the right and left banks 4r
Flow into the intake ports 11r and 11l of each 4l cylinder.
Enter. The left and right intake systems 3l and 3r will be described in detail later.
However, FIGS. 6 and 7 schematically show
Have been. In FIG. 6, 3r is not shown.
No, but has the same configuration as 3l. The upstream ends of the left and right intake systems 31 and 3r are provided with surges.
Left and right chambers functioning as tanks (first chamber
-) It is 40l and 40r. 40l of the first chamber
, 40r are each airtight with two casing blocks
Are connected to each other by bolts.
One of the casing blocks
The inner halves 41l and 41r are intake manifolds to be described later.
The door case 20 is formed integrally with the door case 20 by casting.
Outer half (throttle base) 42 l
, 42r are slots provided at the center in the longitudinal direction.
Together with the body mounting flanges 43l and 43r
Left and right which are integrally formed to constitute the intake manifold 3
It is a pair of independent components. In addition, 10l, 10r
Is the throttle body, 13l and 13r are the throttle body 10.
l, Throttle valve installed inside 10r. First intake passage portions of left and right intake systems 31 and 3r
The four pairs of left and right branch intake pipes 21l and 21r
5, the left and right branch intake pipes as better illustrated
21l and 21r are arranged so that they alternate one by one
And the respective inner halves 41l, 41 of the second chambers 40l, 40r
r together with the intake manifold
Form the intake manifold upper 20 that forms the upper part of C3
are doing. The intake manifold upper 20 is also
The left and right formed in the intake manifold drawer 30 described later
The pair of chambers (second chamber) 31l and 31r
They communicate with each other and surround them in a spiral shape.
Winding) Arcs that form part of the four pairs of spiral pipes 32l and 32r
32l ₁ , 32r ₁ And terminal part 32l _Three , 32r _Three And have together
(See FIG. 2. 32r, 32r ₁ , 32r _Three Is illustrated
Not. ). The left and right four pairs of spiral pipes 32l, 32r are
A second intake passage of the intake systems 3l, 3r is formed. The left and right spiral pipes 32l and 32r are provided with their left spirals.
The winding direction of the wound pipe 32l is right-handed,
The winding direction of Ip32r is left-handed, and the winding directions are
In the opposite direction, cross each other one by one
Four pairs are formed and their ends 32l _Three , 32r _Three Is left
At the base end of the right four pairs of branch intake pipes 21l and 21r respectively
They are tangentially connected. Left and right spiral pipe 32l
32l, central part 32l _Two , 32r _Two Is a pair of left and right second
The members 31l and 31r are surrounded in a substantially U-shape.
(See FIG. 2. 32r _Two Is not shown. ). Ends 32l of spiral pipes 32l, 32r _Three , 32
r _Three Is connected to the base end of the left and right branch intake pipes 21l and 21r.
Left and right branch intake pipes 21l, 21r on the upstream side
Inside, as shown in FIG.
1 open / close valve) 27l and 27r are provided on the left and right, respectively.
(27r not shown), the pipe length switching valves 27l, 27r
By opening and closing the first chambers 40l, 40r
The left and right branch intake pipes 21l and 21r communicate with each other and disconnect
Is done. The pipe length switching valves 27l and 27r are
Common valve shafts 44l, 44 according to operating conditions (rotational speed, vehicle speed, etc.)
r and a pair of diaphragms 28l via a link mechanism,
Opening / closing is controlled by 28r (see FIG. 1). This pair of
The ear flams 28l and 28r have one common negative pressure chamber.
One-piece diaphragm, right of the last row in the vehicle traveling direction
Attached to the center of the rear wall of the branch intake pipe 21r
I have. Four pairs of left and right branches of the intake manifold upper 20
End faces of lower opening of intake pipes 21l and 21r, spiral pipe
32l, 32r arc-shaped base end 32l ₁ , 32r ₁ And terminal part 32l _Three , 32
r _Three The lower open end faces of the internal combustion engine are flush with each other.
Left and right cylinder heads 6l, 6r of body 2 and intake manifold
A mounting surface A to the hold drawer 30 is formed. But
Therefore, the intake manifold 3 can be moved to the left
It is placed and fixed on the right cylinder heads 6l and 6r,
It is disposed between the left and right banks 4l, 4r. The mounting surface A of the intake manifold upper 20 is on the left.
Left and right ends of intake manifold upper 20 projecting outward to the right
The wall has an injecting surface as shown in FIGS.
Of four injectors on each of the left and right
The barrels 29l and 29r are formed in a single row in the front-rear direction. Below the intake manifold upper 20, there is an intake
Intake manifold drawer 30 that forms the lower part of manifold 3
Are airtightly and integrally attached by bolts. Sucking
The air manifold drawer 30 is inverted as shown in FIG.
It consists of a casting block with a contour of a square shape.
In the center of the part, as shown in FIGS.
Left and right pair of chambers (second chamber) 31l, 31r
Are formed so as to communicate in the length direction (in FIG. 4,
31r is not shown). In the second chambers 31l and 31r, the ceiling
Left and right four pairs of upper openings 33l, 33r alternate in the length direction on the well surface
The upper openings 33l, 33r are formed in the second channel.
Four pairs of vortices surrounding the chambers 31l and 31r in a spiral
Arc-shaped base end 32l of wound pipe 32l, 32r ₁ , 32r ₁ Into it
Each is connected for communication. Therefore, a pair of left and right second chambers
31l, 31r are four pairs of left and right upper openings 33l, 33r and left
Four pairs of right and left pairs via the right four pairs of spiral pipes 32l and 32r
Are connected to the base ends of the intake pipes 21l and 21r, respectively.
(See arrows in FIGS. 2 and 5. In FIG. 2, 32r
, 21r are not shown. ). A pair of left and right first chambers 40l, 40r
Are their lengths as illustrated in FIGS. 3 and 5.
The central part of the direction communicates via the communication path (second communication path) 22
Connected as possible. The communication path 22 includes a resonance switching bar.
Lube (second opening / closing valve) 24 is provided.
By opening and closing the valve 24, the communication path 22 is connected and disconnected.
Passed through. The communication passage 22 is provided in each of the left and right banks 4l and 4r.
It is formed so as to be located at the center in the arrangement direction of the tubes.
I have. The resonance switching valve 24 is connected to the engine operating state (rotational
Speed, vehicle speed, etc.) via the link mechanism 25.
Opening / closing is controlled by the ram 26 (see FIG. 1). This resonance cut
The exchange valve 24 is provided as shown in FIGS.
And the communication passage of the intake manifold upper 20
From the opening formed in the upper vessel wall where the 22 is formed
The valve shaft is inserted into the passage 22 and the tip of the valve shaft is connected to the intake manifold.
It is mounted on the bearing of the inner wall of the door
Have been. The diaphragm 26 includes diaphragms 28l, 28
r close to r
Diaphragms 26, 28l, 28r with intake manifold 3
They are arranged on the rear wall in both traveling directions. A pair of left and right second chambers 31l, 31r
Are located at the center in the longitudinal direction through communication passages 23l and 23r.
And the left half portion 22l of the resonance switching valve 24 of the communication passage 22
And the right half portion 22r.
Through the left half 22l and the right half 22r of passage 22
And a pair of left and right first chambers 40l and 40r, respectively.
Communication is established. Therefore, a pair of left and right second chambers
31l, 31r and a pair of left and right first chambers 40l, 40r
These communication passages (the communication passage 23l and the left half 22 of the communication passage 22)
l, left and right through the communication passage 23r and the right half 22r of the communication passage 22
Each chamber is always in communication.
The communication passages 23l and 23r are also provided for the cylinders of the left and right banks 4l and 4r.
It is formed so as to be located at the center in the arrangement direction.
The intake manifold upper 20 and the intake manifold
A. The communication passage 23l and the left half 22l of the communication passage 22 communicate with each other.
A pair of left and right combined passages of the road 23r and the right half 22r of the communication passage 22
Constitute a pair of left and right first communication paths. Second run
As described above, the communication path 22 constituting the path is a pair of left and right
Connect the first chambers 40l and 40r so that they can communicate with each other.
However, at the same time, communication between the pair of left and right first communication passages is also possible.
Connected to the engine, as described below,
When the resonance switching valve 24 is opened in
A pair of first chambers 40l, 40r and a pair of left and right second chambers
Chambers 31l, 31r, total 4 chambers 40l
, 40r, 31l, 31r
Wear. In this manner, a total of four chambers on the left and right
-Communication between all 40l, 40r, 31l, 31r
Sometimes these chambers are in left and right banks 41, 4
The right and left intake systems for the intake ports 11l and 11r of each cylinder of r
3r, 3l via the first intake passage and the second intake passage
Function as a single large-volume inertial chamber
It is possible to improve the volumetric efficiency based on the sexual supercharging effect. Ma
The intake ports 11l of each cylinder of the left and right banks 4l, 4r,
Prevent interference of intake air supplied to 11r. A pair of left and right first chambers 40l,
40r and a pair of left and right second chambers 31l and 31r
As described, the left and right through the pair of left and right first communication passages
Each chamber is always in communication,
These left and right chamber comrades are described later.
In the high rotation speed region of the internal combustion engine, the resonance switching valve 24
Since the communication passage 22 is closed (disconnected),
The left and right chamber systems are completely independent of each other.
You. This left and right chamber system is composed of right and left banks 4r and 4l.
Independent intake line for each cylinder for each cylinder
It functions as a resonance chamber that does not overlap
It is possible to improve the volumetric efficiency based on the feeding effect. The left and right intake systems 3l, 3r
In the bar system, the first intake passage section (four pairs of left and right branch intake pie
21l, 21r) and the second intake passage (4 pairs of left and right spirals)
Pipes 32l, 32r) are connected and connected.
(See FIGS. 2 and 6). Next, the V-type multi-cylinder internal combustion engine in this embodiment
The operation and effect of the variable intake device of the engine 1 will be described.
In the present embodiment, the intake manifold 3 is provided with a pipe length switch.
And a variable intake function based on resonance switching. Now, the rotational speed N of the internal combustion engine 1 _e Is the prescribed low
Speed N ₁ Assuming that it is in a lower low rotation speed range (N
_e <N ₁ ), As shown in FIGS. 7 and 10
The long switching valves 27l and 27r are closed and the resonance switching valve 24
Are opened, a pair of left and right first chambers 40l, 40r
And four pairs of left and right branch intake pipes 21l, 21r
Communication is cut off. The communication passage 22 and the left and right communication
Passages 23l, 23r, a pair of left and right second chambers 31l, 31
r, left and right (right and left winding) four pairs of spiral pipes 32l, 32r
6 (see channel B in FIG. 6 and FIG. 7).
Air cleaner, not shown, left and right throttle bodies
10l, 10r, a pair of left and right first chambers 40l,
The intake air taken into the 40r
The cylinders of the right and left banks 4r and 4l (# 1
♯8) are supplied to the intake ports 11r and 11l, respectively.
You. Therefore, in this state, the left and right
To the intake ports 11l, 11r of the cylinders 4l, 4r
The intake passage length (intake pipe length) of the right and left intake systems 3r and 3l is sufficient.
Min., Including the extremely low engine speed range
High inertia supercharging effect suitable for the low engine speed range
And high volumetric efficiency can be obtained (the inertia of FIG. 10).
region). As a result, the output in the low engine speed range
The torque can be improved. Further, a pair of left and right first chambers 40l
, 40r and a pair of left and right second chambers 31l, 31r
Means that all four chambers are in communication
Since the bar capacity is secured, a standard air intake system
Or larger chamber volume than the base engine
Chamber volume, a single large volume
Function as an inertial chamber for
And further improve volumetric efficiency. Also,
Reduction in volumetric efficiency in the low rotation speed range caused by interference
To prevent. Next, the rotational speed N of the internal combustion engine _e Is medium rotation speed
When the temperature reaches (N ₁ <N _e <N _Two ), FIGS. 8 and 1
0, the pipe length switching valves 27l and 27r are opened.
Left and right pair of first chambers 40l, 40r and left and right
The four pairs of branch intake pipes 21l and 21r are short-circuited and
The air passage length becomes the shortest (flow path C in FIG. 6, see FIG. 8).
High inertia supercharging effect suitable for medium speed range of Seki
As a result, high volume efficiency can be obtained (the inertia of FIG. 10).
region). During this time, the resonance switching valve 24 remains open.
Has been maintained. The rotational speed N of the internal combustion engine _e But higher rotation speed
Reach the area (N _Two <N _e ), Illustrated in FIGS. 9 and 10
The resonance switching valve 24 is closed and the pipe length is switched.
Since the valves 27l and 27r are kept open, the left and right
The left and right links 4l and 4r are completely separated right and left
Left intake system 3r, 3l, left and right bank 4l
, 4r are connected to the intake ports 11l, 11r of each cylinder
A pair of right and left first chambers 40r and 40l and a pair of right and left first chambers
The left and right chambers 31r and 31l are independent of each other.
Demonstrating the function of a resonance chamber, four pairs of right and left branch intake air
Ip 21r, 21l and right and left four pairs of spiral pipes 32r, 32
l, the respective banks of the left and right banks 4l, 4r
(Pulsation) effect on other cylinders during the intake stroke
And a high resonance supercharging effect is obtained as a whole.
High volumetric efficiency (resonant region in FIG. 10).
Area). As described above, according to the present embodiment, the V-shaped
The variable intake device of the cylinder internal combustion engine 1 has an intake manifold 3
Switching of the pipe length and resonance switching in the
Inertial supercharging effect caused by inertia exhibited by column flow
And a positive pressure wave generated at the intake port when the intake valve closes.
Reciprocating between the intake port and the atmospheric pressure side of the intake passage
Resonance caused by returning as a positive pressure wave after
(Pulsation)
From the low rotation speed range of the internal combustion engine to the high rotation speed range.
High volumetric efficiency and high output over a wide rotation speed range
Torque can be obtained. A pair of left and right first chambers 40l,
The center of the length of 40r is communicated through the communication passage 22 and
The central part in the longitudinal direction of the pair of right second chambers 31l and 31r
Is the left half 22l, right of the communication passage 22 via the communication passages 23l, 23r
The left half 22l and the right half are connected to the half 22r.
A pair of left and right first chambers 40l, 40r via the part 22r
Each is communicated. Moreover, these communication points
Is located at the center of the left and right banks 4l and 4r in the cylinder arrangement direction.
Therefore, in the entire engine speed range,
Intake ports 11l, 11r for each cylinder of left and right banks 4l, 4r
The distribution of the intake air to the
The intake passage length of the
Can be reduced. Further, an intake manifold drawer 30 is formed.
32l, the end of the spiral pipe 32l, 32r _Three , 32r _Three Is the intake
A branch intake pipe 21l formed in the manifold upper 20;
21r is tangentially connected to the base end of the
The pipes 21l, 21r are connected via pipe length switching valves 27l, 27r.
Since it directly faces the first chambers 40l and 40r,
Intake passages in low, medium, and high rotational speed operating conditions in Seki
Shape can be made smooth without difficulty.
It is possible to improve engine output by reducing air passage resistance.
it can. Further, the pipe length switching valves 27l, 27r,
The resonance switching valves 24 and their operating mechanisms are connected to the intake manifold.
Since it can be assembled and assembled on the rudder upper 20,
The intake manifold 3 can be made compact,
The amount of overhang of the internal combustion engine body 2 in the upward direction is small.
Can be suppressed. With this, the left and right banks 4l,
Efficient use of the space between 4r and variable intake function
Intake manifold 3 to V-type multi-cylinder internal combustion engine 1
Can be mounted while holding down. In this embodiment, a V-type multi-cylinder internal combustion engine
1 is a V-type 8-cylinder internal combustion engine, but is not limited to this.
However, it is not applicable to other V-type multi-cylinder internal combustion engines such as V-type six cylinders.
Can be.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic plan view of a V-type multi-cylinder internal combustion engine to which a variable intake device according to an embodiment of the invention described in claim 1 of the present application is applied. 2 is a sectional view taken along the line II-II of FIG. 1; FIG. 3 is a sectional view taken along the line III-III of FIG. 1; FIG. 4 is a sectional view taken along line IV-IV of FIG. 1; 5 is an exploded perspective view of the intake manifold in the embodiment of FIG. FIG. 6 is an explanatory diagram schematically showing a connection configuration between an intake chamber and an intake passage on a left half side of the intake manifold. FIG. 7 is a schematic diagram showing one operation state of a variable intake device provided in the intake manifold. FIG. 8 is a schematic view showing another operation state. FIG. 9 is a schematic view showing still another operation state. FIG. 10 is a characteristic diagram of the variable intake device of FIG. 1; [Description of Signs] 1. Vertical V-type 8-cylinder internal combustion engine, 2. Internal combustion engine main body,
3 ... intake manifold, 3l, 3r ... left and right intake system, 4l,
4r: Left and right banks, 5: Cylinder block, 6l, 6r
... left and right cylinder heads, 7l, 7r ... left and right cylinder head covers, 8 ... oil pans, 10l, 10r ... left and right throttle bodies, 11l, 11r ... left and right intake ports, 13l, 13r ...
Throttle valves, 14l, 14r… left and right injectors, 15
l, 15r: left and right blow-by gas passages, 20: intake manifold upper, 21l, 21r: left and right branch intake pipes (first intake passage), 22: communication passage (second communication passage), 22l, 22r
... Left and right communication passages (first communication passage portion), 24... Resonance switching valve (second on-off valve), 25
... Link mechanism, 26 ... Diaphragm, 27l, 27r ... Left and right pipe length switching valve (first on-off valve), 28l, 28r ... Left and right diaphragm, 29l, 29r ... Left and right injector accommodating cylinder, 30 ...
Intake Manihorudoroa, 31l, 31r ... lateral chamber (second chamber), 32l, 32r ... spiral pipe (second intake passage portions), 32l _1, 32r ₁ ... lateral arcuate base portion, 32l _2,
32r ₂ ... left and right central part, 32l ₃ , 32r ₃ ... left and right end part, 33l, 33
r ... left and right upper opening, 40l, 40r ... left and right chamber (first
Chamber), 41l, 41r ... left and right inner halves, 42l, 42
r ... left and right outer halves (throttle base), 43l, 43r ...
Left and right throttle body mounting flanges, 44l, 44r…,
A: mounting surface, B :, C: intake channel.

Claims (1)

(1) A V-shape in which left and right banks have ignition timings that explode alternately and at equal intervals, and a completely symmetric intake manifold is arranged between the left and right banks. In the variable intake device for a multi-cylinder internal combustion engine, the intake manifold includes: a pair of left and right first chambers to which a pair of left and right throttle bodies are connected; and a pair of left and right first chambers for intake of each cylinder of the right and left banks. A plurality of left and right pairs of first intake passages directly communicating with the ports; and a pair of left and right first chambers that are always connected to the left and right chambers via the pair of left and right first communication passages. A pair of left and right second chambers located substantially at the center of the valley of the bank; and a pair of the left and right second chambers at the base ends of the plurality of left and right first intake passages. A plurality of pairs of second air intake passages, which are formed in a spiral shape integrally with these chambers around the entire periphery of the pair of left and right second chambers, and are wound right and left, A plurality of pairs of left and right-handed second intake passages are respectively connected to the base ends of the first pair of left and right intake passages. A first on-off valve for communicating or disconnecting these first intake passages with the pair of left and right first chambers, respectively, and a second valve for communicating between the pair of left and right first communication passages; A second opening / closing valve for opening and closing the second communication passage is provided in the communication passage, and the first opening / closing valve and the second opening / closing valve can be switched according to an engine speed. When the engine speed increases and reaches the middle speed range, the first opening is performed. The valve is opened,
The variable intake device for a V-type multi-cylinder internal combustion engine, wherein the second on-off valve is closed when the engine rotation speed further increases and reaches a high rotation speed region.