JP2003083074A - Variable intake system for multi-cylinder engine - Google Patents

Abstract

(57) [Summary] (Modifications required) [Problem] To enable maintenance of an on-off valve by simply removing the outer lid from an intake distribution box, to easily form a valve hole, and to limit the opening and closing of the on-off valve. Is simplified. SOLUTION: A distribution box main body having one half of a partition wall between first and second distribution chambers, and a light metal casting lid body detachably connected to the distribution box main body having another half portion 35b of the partition wall. 44
Constitutes an intake distribution box, and the partition piece 56 has a deep notch 4
0a and a U-shaped shallow notch 40 constituting a valve hole 40
The stopper projection is formed on the outer surface of the lid 44 and is fixed to the valve shaft 53 of the on-off valve 41 for opening and closing the valve hole 40 and receives the operating lever driven by the actuator to define the on-off limit of the on-off valve 41. Was integrally formed.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention
An intake inlet connected to the intake passage of the rottle body is provided.
The inside of the intake distribution box is connected to the intake port by a partition wall.
Are divided into first and second distribution chambers through which the first and second distribution chambers pass.
The first and second engine compartments are opened to the two distribution chambers respectively.
1st and 2nd intake parts respectively connected to the intake port of the ink
The manifold is connected to the intake distribution box, and the first and
An on-off valve that can communicate and shut off the second distribution chamber is provided.
By opening and closing the on-off valve according to the operating state of the
By changing the intake characteristics, the wide range from low to high engine speed
A multi-cylinder engine designed to maintain high output performance in the operating range
The present invention relates to an engine variable intake device. 2. Description of the Related Art A variable intake device for such a multi-cylinder engine.
Is disclosed, for example, in JP-A-9-88746.
As already known. [0003] By the way, in the above publication,
In the disclosed intake system, the on-off valve is supported
A bulkhead having a valve hole opened and closed by the on-off valve
Is interposed between the distribution box body and the intake manifold
Configuration for on-off valve maintenance.
Is to disassemble the distribution box body and the intake manifold.
Good maintenance because troublesome work is required
It can not be said. [0004] The present invention has been made in view of such circumstances.
So just remove the outer lid from the intake distribution box
So that maintenance of the on-off valve can be
Good nonce and easy to form valve holes
And the structure of the stopper means that defines the opening / closing limit of the on-off valve.
The multi-cylinder air conditioner, which is
An object of the present invention is to provide a variable intake device for an engine. [0005] In order to achieve the above object,
In addition, the present invention provides the intake body of the throttle body with an intake distribution box.
A suction inlet connected to the road is provided, and the inside of the suction distribution box is
From the first and second sections respectively communicating with the intake port.
And divided into first and second distribution rooms.
To the intake ports of the first and second banks of the engine.
Connect the first and second intake branch pipes respectively connected to the intake distribution box.
And connects the first and second distribution chambers to the partition wall.
A valve hole and an on-off valve for opening and closing the valve hole.
An actuator that opens and closes the valve is attached to the intake distribution box
In the variable intake device for a multi-cylinder engine,
Air inlet, the first and second intake branch pipes and the partition wall
Having one half and passing between the first and second distribution chambers.
Opening on the outside opposite to the first and second intake branch pipes
Having a distribution box body provided on the wall and the other half of the bulkhead,
It is detachably connected to the distribution box body so as to close the opening.
The intake distribution box is composed of the lid and the lid, and the lid is
The first and second parts of the bulkhead are made of light metal casting.
And a valve hole communicating between the second distribution chamber and the valve hole
With multiple bearing holes aligned coaxially to support the valve shaft of the on-off valve
Is formed, and the other half of the bulkhead is mainly composed of the other half of the bulkhead.
It is divided into partition pieces that are bolted to this,
The main part of the half is provided with the plurality of bearing holes and the space between the bearing holes.
The opposite side edges are placed at the distance between the two sides.
U-shaped deep notch with a taper that expands toward the surface
On the other hand, along with the deep notch,
A U-shape that aligns the opening surfaces to form a valve hole
Form a shallow notch on the outer surface of the lid and at one end of the valve stem.
An operation lever fixed and driven by the actuator
A bar that receives the bar and defines the opening / closing limit of the on-off valve
The lid projection is integrally formed. According to this feature, one lid and one on-off valve are used.
Of the distribution box main body.
By removing the valve from the
Nonces can be performed easily and maintenance is improved.
Can contribute to The lid made of light alloy casting is a suction branch pipe.
Smaller and simpler than the distribution box body
Therefore, precision casting such as high-pressure die casting can be performed. did
Therefore, post-processing of the valve hole is unnecessary, and it is highly rigid and
High quality that does not cause distortion even due to ambient temperature changes
Quality lid is easily obtained, and the opening and closing supported by it
A good opening and closing operation of the valve is always performed regardless of changes in the ambient temperature.
Can be secured. The other half of the partition wall is mainly composed of the other half of the partition wall.
And a partition piece that is bolted to it.
The other half of the wall is mainly composed of the bearing holes and the space between these bearing holes.
While forming a U-shaped deep notch located in the
In the wall piece, together with the deep notch, the valve hole is formed.
U-shaped shallow notches are formed to match the opening surfaces
Therefore, when casting the other half main body and the partition piece,
From the deep notch and shallow notch that constitute the valve hole
It is easy to release, and after casting, it is difficult to finish valve holes.
In addition, a precise valve hole without scratches on the inner surface can be easily formed.
Thus, productivity can be improved. [0009] Further, the outer surface of the lid is fixed to one end of the valve shaft.
Actuated lever mounted and driven by the actuator
To determine the opening / closing limit of the valve.
With the integral projections on the actuator,
Accurate opening / closing limit of on-off valve without providing
Can be specified, and the stopper projection
The structure is simplified by integration, and the valve hole is easily formed.
That together can greatly contribute to cost reduction
You. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention.
The following description is based on one embodiment of the present invention shown in the drawings.
You. FIG. 1 is an overall side view of an outboard motor, and FIG.
FIG. 3 is a longitudinal sectional view of a main part, FIG. 3 is a sectional view taken along line 3-3 in FIG. 2, and FIG.
2 is a sectional view taken along line 4-4, FIG. 5 is a sectional view taken along line 5-5 in FIG.
6 is a sectional view taken along line 6-6 of FIG. 5, and FIG. 7 is a sectional view taken along line 7-7 of FIG.
Fig. 8 is an exploded view of the main part of the intake manifold corresponding to Fig. 5.
FIG. 9 is a sectional view taken along line 9-9 of FIG. 8, and FIG.
FIG. 11 is a view taken in the direction of arrow 11 in FIG. 8, and FIG.
11 is a sectional view taken along line 12-12, and FIG. 13 is a sectional view taken along line 13-13 in FIG.
FIG. 14 is a sectional view showing a method of casting the lid. [0012] In the following description, front, rear, left and right means
What is said based on the hull H to which the outboard motor O is attached
And In FIG. 1 to FIG.
The outboard motor O to be attached is the mount case 1, this mount
Extension cable connected to the lower end of
2 and the lower end of this extension case 2.
Gear case 3 to be mounted
V-type 6-cylinder water-cooled 4-stroke engine E
It is mounted with the crankshaft 4 placed vertically. A stay 13 is mounted on the mount case 1.
The annular under cover 14 is fixed via the intermediate cover 14. This Ann
The cover 14 is extended from the lower part of the engine E.
Cover the section up to the top of case 2
At the upper end, an engine hood 12 that covers the engine E from above
Is detachably attached. This engine hood 12
The engine E is accommodated by the under cover 14 and
An engine room 15 is defined. The engine E supports a vertically installed crankshaft 4.
And the crankcase 5
A pair of left and right banks 6L extending in a V-shape toward the rear,
6R, and the lower surface of the crankcase 25 is
It is bolted to the upper mounting surface of the mount case 1.
You. As shown in FIGS. 5 and 6, each bank 6
L and 6R are a plurality of lines arranged vertically (three in the illustrated example)
Cylinder bores 7L and 7R. Also left and right banks
6L and 6R are bolted to the rear end face of the crankcase 25.
And a cylinder having the left and right cylinder bores 7L and 7R.
The cylinder block 7 and the cylinder block 7
At the left and right rear end faces where the dowel bores 7L and 7R open respectively
A pair of cylinder heads 9L, 9R which are bolted together,
Valve chambers formed in these cylinder heads 9L and 9R are
Connected to rear end face of cylinder head 9L, 9R to close
And a pair of head covers 10L and 10R.
It is. 2 to 4, the engine hood 12
An air inlet 16 is provided in the upper part of the rear surface of the
The lower end of the engine room 15
The flat ventilation duct 17 opening to the lower part of the engine
The door 12 is disposed along the inner surface of the rear wall. This ventilation duct
Air taken into engine room 15 by 17
Through the intake silencer 18 and the intake manifold Mi.
Then, air is sucked into the left and right banks 6L and 6R. The intake silencer 18 is provided on the upper surface of the engine E.
It can be attached and has a box shape.
The inlets 20, 20 are arranged between the inlets 20, 20.
Outlet 21 to be provided. At the exit 21
The upstream end of the intake path 22a of the disk 22 is connected. That sucking
In the airway 22a, an accelerator lever provided on the hull H
(Not shown), the throttle valve 23 is pivotally supported.
You. Referring to FIGS. 5 to 7, the throttle body
Intake manifold connected to the downstream end of the intake passage 22a of the air intake 22
De Mi faces the valley 24 between the left and right banks 6L and 6R.
It is arranged in. In the valley 24, the left bank 6L
To a plurality of intake ports 25L of the cylinder head 9L
A plurality of left intake pipes 26L to be connected and a series of
A plurality of intake ports 25R formed in the nozzle head 9R.
A plurality of right intake pipes 26R to connect each upstream end backward
It is arranged to face. A plurality of left intake pipes 26L
At the upstream end, a left connecting flange 2 connecting these
7L are integrally formed, and upstream ends of the plurality of right intake pipes 26R.
Has a right connecting flange 27R that connects them to each other.
It is formed integrally. Intake pipes 2 for left and right banks 6L, 6R
6L, 26R, and corresponding intake valves of banks 6L, 6R
Electromagnetic fuel injection valve 28L, 2 for injecting fuel toward
8R is attached. The intake manifold Mi is long in the vertical direction.
And an intake distribution box 30 having a flat shape in the front-rear direction.
Well, this is to straddle both rear faces of left and right banks 6L and 6R.
Placed in In the upper part of the front wall of this intake distribution box 30,
A connecting flange 32 having an inlet 31 at the center is formed.
Formed at the downstream end of the throttle body 22
The connection flange 33 is joined. A space extending in the vertical direction is provided in the intake distribution box 30.
A wall 35 is provided, whereby the inside of the intake distribution box 30 is
Are the left distribution chambers 37L and
And a right distribution chamber 37R. Inlet 35
The air that has flowed into the port 31 is supplied to the left and right distribution chambers 37L and 37R.
A guide wall 36 for diverting is continuously provided. Also, facing the valley 24 of the intake distribution box 30.
The front wall communicates with the left and right distribution chambers 37L and 37R, respectively.
Left intake branch pipe 38L and right intake branch pipe 38R
Are integrally formed. A plurality of left and right intake branch pipes 38L,
At the downstream end of the 38R, one link connecting these
The connection flange 39 is formed integrally with the left and right intake air.
Bolts on connecting flanges 27L, 27R of pipes 26L, 26R
Are combined. The inside of the intake distribution box 30 is divided into left and right distribution chambers 37.
L, 37R, both partitioning chambers 37
A pair of upper and lower valve holes 40 that directly communicate between L and 37R are provided.
And a pair of butterfly-type openings for opening and closing the valve hole 40.
The valve closing 41 is pivotally supported. During the operation of the engine E, the intake sile
The air flowing into the left and right inlets 20 of the sensor 18 is
Merge in the air silencer 18 and exit 21
The intake manifold 22 passes through the intake passage 22a of the
De Mi toward the intake inlet 31 of the intake distribution box 30. That
At this time, in the intake path 22a, the opening degree of the throttle valve 23
Thus, the intake amount of the engine E is controlled. In the low speed operation range of the engine E, the intake distribution box
The on-off valve 41 in the valve 30 is closed, and the intake
The air flowing into the intake port 31 of the manifold Mi is
To the left and right distribution chambers 37L and 37R extending to the left and right. Soshi
The air diverted to the left distribution chamber 37L is divided into a plurality of left intake air
It is further diverted to the manifold 38L, passes through the left intake pipe 26L, and is
Through the intake port 25L of the
The air is sucked into 27L. In addition, it was diverted to the right distribution chamber 37R.
The air is further divided into a plurality of right intake branch pipes 38R, and the right intake branch pipe 38R is diverted to the right intake branch pipe 38R.
Through the trachea 26R and the intake port 25R of the right bank 6R
And the air is sucked into the corresponding cylinder bore 27R. In the low-speed operation range of the engine E,
Left where the upstream ends of the left and right intake branch pipes 38L, 38R open
The distribution chamber 37L and the right distribution chamber 37R are connected to the upper intake port 3
Except for the communication part with No. 1, it is shut off by the on-off valve 41 in the closed state.
From the left distribution chamber 37L to the left bank 6L.
From the intake system to the intake port 25L and from the right distribution chamber 37R
The intake system to the intake port 25R of the right bank 6R and more
, Two systems of supercharged intake systems that do not interfere with each other
And the natural vibration of each resonance supercharging intake system is
Intake of each bank 6L, 6R in the low-speed operation range of engine E
It is set so that it approximately matches the opening and closing cycle of the valve.
As a result, the resonance supercharging effect is effectively exhibited,
Increased charging efficiency in the operating range and improved output performance
Can be In the high-speed operation range of the engine E, the intake air
The on-off valve 41 in the distribution box 30 is open,
The left and right distribution chambers 37L and 37R are connected via the valve hole 40.
One surge tank of large capacity is constructed by communicating with each other.
Above the left and right intake branch pipes 38L and 38R in the surge tank
Since the flow end is open, the intake air in each bank 6L, 6R
Increased inertial capacity and reduced effective length of resonant intake system
The natural frequency of the resonance intake system is
Match the opening / closing cycle of the intake valves of each bank 6L, 6R in the shift area
And the resonance supercharging effect is effectively exhibited,
The intake charge efficiency in the high-speed operation range of the engine E increases,
The force performance can be improved. As shown in FIG. 5 to FIG.
Is composed of a distribution box body 43 made of synthetic resin,
High pressure die cast lid 44 made of light alloy such as gold
It is composed of The distribution box body 43 is connected to the connecting flange 3.
2. One of the left and right intake branch pipes 38L, 38R and the partition wall 35
The intake branch pipe 38 is formed integrally with the half 35a.
The left and right distribution chambers 38L, 38R,
An opening 45 is provided over the opening 38R.
The periphery of the mouth 45 is an inward joining flange 46
I have. The lid 44 closes the opening 45.
Then, on the inner surface, surrounding the opening 45,
Loop-shaped surrounding wall 47 facing the edge 46 and the partition wall 3
5 is formed integrally with the other half 35b.
Are formed with a plurality of mounting bosses 47a. And fence
The wall 47 is sandwiched by the joining flange 4 with a sealing member 49 interposed therebetween.
6 and attach the mounting boss 47a to the joint flange.
46 to the opening 4
5 is closed airtight. At this time, one half 35 of the partition wall 35
A seal member 52 is also interposed between a and the other half 35b. The pair of upper and lower valve holes 40 and the on-off valve 41 are
The other half 35b of the partition wall is provided. Each valve hole 40 has its long side up
It is formed in a rectangular shape with downwards and rounded corners.
Correspondingly, each on-off valve 41 also forms a similar rectangle.
ing. The pair of upper and lower on-off valves 41 is a common
Is attached to one valve shaft 53, and the valve shaft 53 is
The other half 35b of the bulkhead is drilled from the lower end face of the body 44.
At both ends by three coaxial bearing holes 54a, 54b, 54c.
And the middle part is supported rotatably. The two valve holes 40 are formed at the center of the partition wall 35 in the longitudinal direction.
Therefore, at the processing start end side of the bearing holes 54a, 54b, 54c,
It is entirely offset at a certain lower end. do this
And the span of the valve shaft 53 is necessary only for supporting the on-off valve 41.
The length can be set to the minimum length and the bearing hole 54
For drilling a, 54b, 54c, relatively short drill
Can be used, and each bearing hole 54a, 54b, 54c
Processing accuracy easily without the need for advanced skills.
I can do it. Also, bearing holes 54a, 54b, 54c
Is located on the opposite side of the inlet 31
Therefore, a relatively short drill is used regardless of the existence of the intake port 31.
Therefore, the bearing holes 54a, 54b, 54c can be easily and precisely formed.
Can be processed at any time. Thus, the other half 3 of the partition wall integral with the lid plate 98
Since the on-off valve 41 is pivotally supported on the 5b, the lid plate 98 and the on-off valve
After assembling the assembly of the valve 41, the cover plate 98 is connected to the intake port.
By adhering to the distribution box 30, the intake air with the open / close valve 41 is provided.
The distribution box 30 can be assembled efficiently. Another minute
Lid 44 coupled to joint flange 46 of distribution box main body 43
The inner loop wall 47 is necessary for the intake distribution box 30
While securing the volume, the cover 44 together with the other half 35b of the partition wall.
It also functions as a reinforcing rib to enhance the rigidity of the
After molding and bolt tightening force on the distribution box body 43
The thickness of the lid 44 is reduced while preventing distortion due to
Can contribute to weight reduction. In particular, the lid 44 having the valve hole 40 is
As compared to the distribution box main body 43 integrated with the branch pipes 38L and 38R.
Since it is small and simple,
Dense casting becomes possible. Therefore, post-processing of the valve hole 40
Unnecessary, high rigidity, and changes in ambient temperature
A high quality lid 44 which does not cause distortion is easily obtained.
Can be The lid 44 is provided with an enclosing wall 47 on its inner surface.
Is effectively reinforced by the
Bearing holes 54a, 54b formed in the other half 35b of the partition wall,
The bearing holes 54a, 5c are not deformed.
The opening / closing valve 41 for supporting the valve shaft 53 on 4b and 54c is
Always open and close smoothly regardless of changes in ambient temperature.
Can be. Further, the surrounding wall 47 on the inner surface of the lid 44 is
It also serves to expand the runway when casting the body 44,
44 improves castability, which also contributes to quality improvement. The outer wall of the cover 44 corresponds to the valve hole 40.
An outward bulging portion 44a is formed in the portion,
And the height of the other half 35b of the partition wall is increased.
The valve hole 40 having a large opening area can be formed. Again
The volume of the intake distribution box 30 is increased by the bulging portion 44a of
You can also. Further, it is possible to mold the valve hole 40.
For this reason, as shown in FIG.
Partitioning the valve hole 40 in a plane perpendicular to the wall of the
The other half main body 55 and the partition piece 56 are divided into
Is a U-shaped ratio that is open to the dividing surface of the other half 55 of the bulkhead.
Open the relatively deep notch 40a and the dividing surface of the partition piece 56.
And a relatively shallow U-shaped notch 40b at each opening surface
It is configured according to. At that time, a U-shaped relatively deep cut
The opposite side edges of the notch 40a have a distance between the side edges.
A taper θ that spreads toward the opening surface is provided. On the other hand, U
The relatively shallow notch 40b has a bottom from the opening edge.
The surface is rounded. The on-off valve 41 is provided with the valve hole 4.
Needless to say, it is formed in a shape corresponding to 0.
The partition piece 56 is bolted on both ends to the partition half other half main body 55.
(See FIG. 12). As is apparent from FIG.
The molding die 95 is a female die 9 divided at the periphery of the lid 44.
5b and a male mold 95a.
A projection 97 for forming a deep notch 40a;
Has the same taper θ as the deep notch 40a
I have. Then, both types 95a and 95b are closed and
The molten metal is poured into the cavity 96 defined between them.
When the lid 44 is molded, the deep notch 40a is
The projection 97 is formed by the projection 97 of FIG. After casting, both dies 95a, 9
5b, the deep notch 40a and each side of the projection 97
The taper θ attached to the edge has a draft angle,
The release from the notch 40a can be easily performed.
To obtain a precise deep notch 40a without scratches on the inner surface.
Can be The partition piece 56 should be cast in the same manner.
To precisely form even the shallow notch 40b
Can be. Therefore, no complicated valve hole machining is required after casting
And productivity can be improved. In addition to providing a plurality of valve holes 40,
Ends of a valve shaft 53 common to a plurality of on-off valves 41 for opening and closing the valve
And a plurality of bearing holes 54 in the other half 35b of the partition wall.
a, 54b, 54c, the valve
The overall opening area of the hole 40 is set to be large, and the valve shaft 53 is bent.
To ensure smooth opening and closing of the on-off valve 41
be able to. 9, 11 and 13, the valve
The lower end of the shaft 53 projects below the lid 44,
The operating lever 60 is fixed to the lower end. This operating lever
60 is three arms arranged at intervals in the circumferential direction
60a, 60b, and 60c, and the first arm 6
0a is a stopper projection 6 formed on the lower end surface of the lid 44.
1, the fully open position of the on-off valve 41 is defined.
The second arm 60b is adjusted to the stopper projection 61.
Abutting on the stopper bolt 62 screwed so as to be able to be knotted
Defines the fully closed position of the on-off valve 41
I have. The operating lever 60 is provided with a
The valve spring 63 biasing in the direction is connected. Therefore,
The actuator is opened without providing a stopper means on the actuator 64.
It is possible to accurately define the opening / closing limit of the valve closing 41 and
In addition, the structure is realized by integrating the stopper projection 97 into the lid 44.
And the formation of the valve hole 40 is simple.
Together, it can greatly contribute to cost reduction. The third arm 60c has a negative pressure actuator.
The operating rod 65 of the motor 64 is connected. Negative pressure actuator
The bracket 64 is screwed to the lower surface of the lid 44.
And a casing 66 supported by the casing 67.
The interior is partitioned into an atmosphere chamber 69 and a working chamber 70, and
And a diaphragm 71 coupled to the
At the center of the diaphragm 71, an atmosphere chamber 69 penetrates.
Work that is pivotally connected to the third arm 60c
The moving rod 65 is fixed. The working chamber 70 has a diaphragm.
Return spring 7 for urging ram 71 in the opening direction of on-off valve 41
2 are accommodated. The casing 66 of the negative pressure actuator 64
Is provided with a negative pressure introducing pipe 73 projecting from the negative pressure chamber,
It is controlled in the middle of a negative pressure conduit 75 connecting this with a negative pressure tank 74.
The control 76 is provided. This control 76 is constituted by a solenoid valve.
Is controlled by an electronic control unit (not shown).
In the low-speed operation range of the engine E, it is excited to guide the negative pressure conduit 75.
In the high-speed operation range, and the negative pressure conduit 75 is disconnected.
And make the negative pressure chamber of the negative pressure actuator 64 large.
I am going to release my mind. Therefore, the engine
In the low speed operation range of E, the negative pressure actuator 64 operates.
When the on-off valve 41 is closed and the high-speed operation range is reached, the negative pressure
The on-off valve 41 is set to the valve
It is opened by the urging force of the spring 63. The negative pressure tank 74 is provided with the intake distribution box.
Negative pressure connected to a negative pressure extraction pipe 78 formed at the top of 30
A conduit 79 is connected.
The backflow of the negative pressure from the tank 74 to the negative pressure outlet pipe 78 is prevented.
A check valve 80 for stopping is provided. Therefore,
During operation of gin E, the intake negative pressure generated in intake distribution box 30 is
Negative pressure tank 7 through negative pressure conduit 79 and check valve 80
4 can be stored. As shown in FIG. 9 and FIG.
The lower end surface has a ring adjacent to the outer end of the lowermost bearing hole 22a.
Seal housing 82 and seal housing 8
2 and a washer housing 83 adjacent to the outer end.
It is. An annular seal member 84 is provided in the seal housing 82.
Is installed. The washer housing 83 has a valve shaft 53
A lock that is locked to the outer periphery and faces the outer end surface of the seal member 84.
Abuts on the lip 85 and this clip 85 so that it can rotate and slide.
One or a plurality of washers 86
The presser plate 87 for preventing the washer 86 from coming off is
4 is screwed to the lower surface. The seal member 84 is made of rubber
Made of an elastic material such as
A pair projecting in the opposite direction and closely contacting the outer peripheral surface of the valve shaft 53
Seal lips 84a and 84b,
The surface is made of gold pressed into the inner peripheral surface of the seal housing 82.
A metal reinforcing ring 89 is baked. During the operation of the engine E, the intake distribution box
The intake pulsation, that is, negative pressure and positive pressure are alternately repeated within 30
The above-mentioned sealing of the sealing member 84 can be performed even if a pressure fluctuation occurs.
The lowermost bearing hole 54a is formed by the lips 84a and 84b.
The outside air may enter the intake distribution box 30 through the
The pressure inside the box 30 is reliably prevented from leaking,
Intrusion of dust into the airway intake distribution box 30 and fuel
Leakage of feed and blow-boilers can be avoided.
You. As shown in FIG.
Should fit within the projected figure below the intake distribution box 30.
Placed in At that time, the intake air distribution of the actuator 64
6 and 11 to avoid interference with the box 30.
As shown in FIG.
A concave portion 90 for receiving the upper portion is formed. Thus, an actuation for opening and closing the on-off valve 41
The position of the heater 64 is relative to the valve shaft 53 of the on-off valve 41.
By selecting the coupling position of the operating lever 60, the circumference of the valve shaft
This actuator 64 can be set freely in
A vertical projection of the intake distribution box 30 simply by tilting it forward
It is possible to fit within the area of the
A tutor 64 and, thereby, on the rear side of the intake distribution box 30
The interference with the rear wall of the adjacent engine hood 12 can be easily
Can be avoided. Moreover, the intake port 31 and the actuator
The eater 64 is arranged at both upper and lower ends of the intake distribution box 30.
Therefore, avoiding those interferences,
Can be realized. Moreover, the lower surface of the intake distribution box 30
The upper portion of the actuator 64 is received in the concave portion 90 of
And a relatively large actuator 64 is connected to the intake distribution box.
30 and without interference with the engine hood 12
Can be installed in the engine room. The embodiment of the present invention has been described above in detail.
Ming will make various design changes without departing from the gist
It is possible. For example, the present invention relates to an automobile engine
Can be applied to the variable intake device. As described above, according to the present invention, the intake air distribution
The box is provided with an intake port connected to the intake path of the throttle body.
The partition inside the intake distribution box is connected to the intake
Partitioned into first and second distribution chambers communicating with each other,
Opening the first and second distribution chambers respectively,
1st and 1st connected to the intake ports of the second and second banks, respectively.
Two intake branch pipes are connected to the intake distribution box, and
A valve hole communicating between the first and second distribution chambers, and the valve hole is opened.
An on-off valve for closing is provided, and an
A multi-cylinder engine with a tutor attached to the intake distribution box
In the variable intake device, the intake port, the first and the second
Having two intake branch pipes and one half of the partition wall;
An opening extending between the first and second distribution chambers is formed by the first and second distribution chambers.
Distribution box main body provided on the outer wall opposite to the second intake branch pipe
And the other half of the bulkhead to close the opening
With a lid detachably connected to the distribution box body
Because the intake distribution box is configured, one set of lid and on-off valve
The lid will be separated from the distribution box body
By removing the valve, maintenance of the on-off valve and its surroundings
Service can be performed easily,
Can give. The lid is made of light metal casting, and
The other half of the partition wall is communicated between the first and second distribution chambers.
To support the valve hole and the valve stem of the on-off valve that opens and closes this valve hole
Since multiple bearing holes are formed on the same axis, light alloy casting
The lid made of the structure is compared to the main body of the distribution box integrated with the suction branch pipe.
Since it is small and simple,
Dense casting becomes possible. Therefore, post-processing of the valve hole is unnecessary
High rigidity and distortion due to ambient temperature changes
High quality lids that are easy to produce
In addition, the good opening and closing operation of the on-off valve
It can always be ensured irrespective of changes in temperature. Further, the other half of the partition is mainly composed of the other half of the partition.
And a partition piece that is bolted to it.
The other half of the wall is mainly composed of the bearing holes and the space between these bearing holes.
And the distance between the opposite side edges is
U-shaped deep cut with a taper that expands toward the opening surface
While the notch is formed, the partition piece is
A U-shape that aligns the opening surfaces with each other to form the valve hole
Shallow notch, so that the other half is mainly
Notches, each of which has a valve notch when casting
And easy to release from shallow notch.
Even if the valve hole finishing is not performed, there is no scratch on the inner surface.
High precision valve holes can be easily obtained, improving productivity.
Can be planned. In addition, one end of the valve shaft is fixed to the outer surface of the lid.
Actuated lever mounted and driven by the actuator
To determine the opening / closing limit of the valve.
Since the projections are formed integrally, the actuator
The opening / closing limit of the on-off valve can be accurately regulated without providing
As well as the stopper projection on the lid.
The simplification of the structure is realized by the
Together, this can greatly contribute to cost reduction.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall side view of an outboard motor according to an embodiment of the present invention. FIG. 2 is a longitudinal sectional view of a main part of FIG. FIG. 3 is a sectional view taken along line 3-3 of FIG. 2; FIG. 4 is a sectional view taken along line 4-4 of FIG. 2; FIG. 5 is a sectional view taken along line 5-5 in FIG. 4; FIG. 6 is a sectional view taken along line 6-6 of FIG. 5; FIG. 7 is a sectional view taken along line 7-7 of FIG. 5; FIG. 8 is an exploded view of a main part of the intake manifold corresponding to FIG. 5; FIG. 9 is a sectional view taken along line 9-9 in FIG. 8; FIG. 10 is an enlarged view of a part 10 in FIG. 9; FIG. 11 is a view taken in the direction of arrow 11 in FIG. 8; FIG. 12 is a sectional view taken along line 12-12 of FIG. 11; FIG. 13 is a sectional view taken along line 13-13 of FIG. 11; FIG. 14 is a sectional view showing a method of casting a lid. [Description of Signs] E ····· Engine 6L, 6R ··· First and second banks (left and right banks) 22 ··· Throttle body 22a ··· Intake paths 25L and 25R ··· 1, second intake port (left, right intake port) 30 intake distribution box 31 intake intake 35 partition 35a partition half 35b partition partition other half 37L , 37R ... first and second distribution chambers (left and right distribution chambers) 38L, 38R ... first and second intake branch pipes (left and right intake branch pipes) 40 ... valve holes 40a .. Deep notch 40b Shallow notch 41 On-off valve 43 Distributing box main body 44 Lid 45 Opening 53 Valve shaft 54a 54c ... bearing hole 55 ... partition wall other half main body 56 ... partition wall piece 60 ... operating lever 61 ... Protuberance

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) F02M 35/10 102X 301P F term (reference) 3G031 AA05 AA28 AB07 AC03 BA08 BA14 BA17 BB05 DA05 DA32 DA37 EA02 FA11 HA10

Claims (1)

Claims: 1. An intake distribution box (30) has an intake inlet (3) connected to an intake passage (22a) of a throttle body (22).
1) is provided, and a partition (35) is provided inside the intake distribution box (30).
As a result, the first communicating with the intake port (31) respectively
And second distribution chambers (37L, 37R), which are opened to the first and second distribution chambers (37L, 37R), respectively, and the first and second banks (6L, 6R) of the engine (E).
The first port connected to each of the intake ports (25L, 25R)
And the second intake branch pipes (38L, 38R) are connected to the intake distribution box (30), and the partition wall (35) is connected to the valve holes (37L, 37R) through the valve holes (37L, 37R). 4
0) and an on-off valve (41) for opening and closing the valve hole (40), and an actuator (64) for opening and closing the on-off valve (41) attached to the intake distribution box (30). In the variable intake device, the intake port (3
1), the first and second intake branch pipes (38L, 38R)
A first half (35a) of the partition wall (35) and an opening (45) extending between the first and second distribution chambers (37L, 37R) are connected to the first and second intake branch pipes (3).
8L, 38R) and a distribution box main body (43) provided on the outer wall opposite to the outer wall, and the other half (35b) of the partition wall (35) so as to close the opening (45). A lid (44) detachably connected to the box body (43) constitutes the intake distribution box (30). The lid (44) is made of light metal casting, and the other half of the partition (35) is formed. Part (35b)
In order to support a valve hole (40) communicating between the first and second distribution chambers (37L, 37R) and a valve shaft (53) of an on-off valve (41) for opening and closing the valve hole (40). Forming a plurality of bearing holes (54a, 54b, 54c) arranged coaxially,
Further, the other half (35b) of the partition wall (25) is composed of the other half portion (55) of the partition wall and a partition piece (5) bolted thereto.
6), and the other half of the bulkhead (55) is arranged between the plurality of bearing holes (54a, 54b, 54c) and the bearing holes (54a, 54b, 54c) and opposed to each other. A U-shaped deep notch (40) is provided at each side edge with a taper (θ) in which the distance between the side edges increases toward the opening surface.
a), a U-shaped shallow notch (40b) constituting the valve hole (40) is formed in the partition piece (56) together with the deep notch (40a), and the lid ( 44)
An operating lever (81) fixed to one end of a valve shaft (53) and driven by the actuator (64)
A variable intake device for a multi-cylinder engine, wherein a stopper projection (61) for defining the opening / closing limit of the on-off valve (41) is integrally formed.