JPS635578B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, each cylinder is provided with a main combustion chamber and a sub-combustion chamber, and a flame obtained by electrically igniting the air-fuel mixture supplied to the sub-combustion chamber is supplied to the main combustion chamber. A multiple carburetor used in a torch-ignited multi-cylinder internal combustion engine configured to combust an air-fuel mixture, in particular a first and second main carburetor that supplies an air-fuel mixture to the main combustion chamber, and a second main carburetor that supplies the air-fuel mixture to the main combustion chamber. The present invention relates to a sub-vaporizer that supplies an air-fuel mixture.

Conventionally, in this type of multiple carburetor, the first and second main carburetors and the auxiliary carburetor cannot be disposed close to each other because they are obstructed by each other's throttle valve shafts, or the throttle valves that link these throttle valve shafts are This has the drawback that the interlocking devices must be provided at multiple locations, resulting in an increase in overall size.

An object of the present invention is to provide a multiple carburetor for a torch-ignited multi-cylinder internal combustion engine, which has a simple structure and can eliminate such drawbacks. A first and a second main carburetor are arranged such that their throttle valve shafts are aligned on the same axis, and in the middle of these two main carburetors and below the both throttle valve shafts, An auxiliary carburetor is disposed to supply a mixture to the auxiliary combustion chamber of the engine, and the throttle valve axis of the auxiliary carburetor is arranged parallel to the throttle valve axis of the main carburetor, and the throttle valve axis of the three carburetors is arranged parallel to the throttle valve axis of the main carburetor. A throttle valve interlocking device for interlocking the valve shafts is installed between the three carburetors, and the throttle valve interlocking device is installed at one and the other of opposing ends of the throttle valve shafts of the first and second main carburetors, respectively. The first and second levers are fixed to each other, the third lever is fixed to the end of the throttle valve shaft of the auxiliary carburetor, and the lever is provided between the first and second levers and corresponds to both of the levers. a first interlocking mechanism capable of interlocking the two throttle valve shafts and adjusting relative angular displacement therebetween, a link mechanism connected to the third lever, and the second lever; The present invention also includes a second interlocking mechanism capable of interlocking the two throttle valve shafts corresponding to the two levers and adjusting the relative angular displacement therebetween.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In Fig. 1, E is a torch-ignition four-cylinder internal combustion engine, and the first to fourth cylinders _E1 to _E4 are arranged from the left, and each cylinder has a main combustion chamber. m and an auxiliary combustion chamber a. Intake manifold M on one side of this engine E
The multiple carburetor C of the present invention is installed through the multiple carburetor C, and the air cleaner A is installed on the inlet side of the multiple carburetor C.

The multiple carburetor C consists of a pair of parallel left and right first and second main carburetors C ₁ and C ₂ , and one auxiliary carburetor C ₃ placed between them. Both main carburetors C ₁ and C ₂ are variable bench lily type.
Further, each of the sub-vaporizers _C3 is configured in a fixed bench lily type. The first and second main carburetors C ₁ and C ₂ create a lean mixture in their respective intake passages 1 ₁ and 1 ₂ ,
The lean air-fuel mixture in the intake passage ₁₁ passes through the first distribution passage _D1 of the intake manifold M to the first and second distribution passages D1 of the engine E.
It is supplied to the main combustion chamber m of cylinders E ₁ and E ₂ , and the intake passage 1 ₂
The lean mixture is supplied to the main combustion chambers m of the third and fourth cylinders E ₃ and E ₄ through the second distribution passage D ₂ of the intake manifold M. In addition, the auxiliary carburetor _C3 creates a rich mixture in its intake passage ₁₃ , and the mixture is supplied to the auxiliary combustion chambers a of all cylinders _E1 to _E4 through the third distribution passage _D3 of the intake manifold M. Ru.

The three carburetors C ₁ , C ₂ , and C ₃ are integrally connected to each other via a stay plate S between the carburetor bodies 2 ₁ to 2 ₃ .

As shown in Figures 1 to 4, the first and second main carburetors
C ₁ , C ₂ and auxiliary carburetor C ₃ are connected to each intake path 1 ₁ , 1 ₂ , 1 ₃
is equipped with butterfly-type throttle valves 5 ₁ , 5 ₂ , 5 ₃ , and these throttle valves 5 ₁ , 5 ₂ , 5 ₃ are connected to the corresponding carburetor main body 2 .
Throttle valve shaft 3 ₁ rotatably supported by ₁ , 2 ₂ , ₂ 3 ,
3 ₂ and 3 ₃ respectively, and these throttle valve shafts 3 ₁ ,
It is designed to open and close by rotating 3 ₂ and 3 ₃ .

The first and second main carburetors C ₁ and C ₂ are arranged so that their throttle valve shafts 3 ₁ and 3 ₂ are arranged coaxially, and the sub carburetor C ₃ is arranged such that their throttle valve shafts 3 1 and 3 ₂ are arranged on the same axis. are arranged below the throttle valve shafts 3 ₁ and 3 ₂ and parallel to them.

The above three throttle valve shafts 3 ₁ , 3 ₂ , 3 ₃ are three carburetor
They are interconnected by an interlocking device I installed between C ₁ , C ₂ and C ₃ . This interlocking device I is connected to the 4th, 5th, and 6th
This will be explained using figures. Hereinafter, the throttle valve shaft ₃₁ of the first main carburetor _C1 is the first throttle valve shaft, the throttle valve shaft ₃₂ of the second main carburetor _C2 is the second throttle valve shaft, and the throttle valve of the sub carburetor _C3. axis 3 _3rd
Each is called a throttle valve shaft.

At opposite ends of the first and second throttle shafts 3 ₁ , 3 ₂ there is a
and second levers 7 ₁ and 7 ₂ are fixed, respectively, and a third lever 7 ₃ is fixed to the third throttle valve shaft 3 ₃ .

The first and second throttle valve shafts 3 ₁ , 3 ₂ are arranged at a constant interval, and between them, the first throttle valve shaft 3 ₁ protrudes from the center of the second throttle valve shaft 3 ₂ . A small-diameter intermediate shaft 6 that is rotatably fitted is provided. A bell crank-shaped intermediate lever 8 having two lever arms 8 ₁ and 8 ₂ is rotatably supported on the intermediate shaft 6, and a third lever 7 ₃ is connected to one lever arm 8 ₁ via a link 9. Concatenated.

The first lever 7 ₁ has a connecting piece 7 ₁ a bent in the axial direction of the first throttle valve shaft 3 ₁ , and the second lever 7 ₂ has a pair of connecting pieces 7 ₂ that are similarly bent and facing each other. a,7
₂ b, respectively, and the first and second levers 7 ₁ and 7 ₂
The connecting piece 7 ₁ a and the connecting piece 7 ₂ a are arranged to face each other in the rotating direction. The other lever arm 8 2 of the intermediate lever 8 is inserted between the pair of connecting pieces 7 ₂ a, 7 ₂ b, and this lever arm _{8 2 also} has both sides connected to the connecting pieces 7 2 a, 7 ₂ b.
It has a connecting piece 8 ₂ a opposed to 7 ₂ b.

A first adjusting screw 10 ₁ is screwed onto the connecting piece _{7 1} a of the first lever 7 1 , and its tip is loosely inserted into the notch hole 11 of the connecting piece 7 ₂ a of the second lever 7 ₂ . This screw 1
0 ₁ is provided with a fixed clamping plate 12 and a movable clamping plate 13 that clamp the connecting piece 7 ₂ a from both inside and outside sides,
The first compression spring 1 is inserted between the movable holding plate 13 and the connecting piece 7 ₁ a.
4 ₁ is interposed. Therefore, the spring 14 ₁ springs the connecting pieces 7 ₁ a and 7 ₂ a in opposite directions and maintains the clamping state of the connecting piece 7 ₂ a between the clamping plates 12 and 13. This eliminates play between the first and second levers 7 ₁ and 7 ₂ in the rotational direction.

Further, a second adjusting screw 10 ₂ is screwed into the connecting piece 7 ₂ a of the second lever 7 ₂ , and its tip is brought into contact with the connecting piece 8 ₂ a of the intermediate lever 8 . A second compression spring 14 ₂ is interposed between this connecting piece 8 ₂ a and another connecting piece 7 ₂ b of the second lever 7 ₂ . Therefore, this spring 1
4 ₂ springs the connecting pieces 7 ₂ b and 8 ₂ a in opposite directions to hold the connecting piece 8 ₂ a in pressure contact with the second adjusting screw 10 ₂ . This eliminates the play in the rotational direction of the second lever ₇₂ and the intermediate lever 8.

The springs 14 ₁ and 14 ₂ are connected to the throttle valve shafts 3 ₁ and 14 2 respectively.
It has the strength to not be compressed and deformed by the rotational force normally applied to 3 ₂ and 3 ₃ .

The first and second adjustment screws 10 ₁ and 10 ₂ include
Lock nuts 15 ₁ and 15 ₂ are provided to prevent loosening of the threaded portions with the connecting pieces 7 ₁ a and 7 ₂ a.

An operating lever 4 operated by a throttle grip (not shown) is fixed to the outer end of the first throttle valve shaft ₃₁ .

Thus, by rotating the operating lever 4, the first
When the throttle valve shaft 3 ₁ is _rotated in the _direction of arrow R ₀ in FIGS. ₂ through the connection piece 7 ₂ a of the second throttle valve shaft 3 ₂ , and at the same time, the connection piece 7 ₂ b of the second lever 7 ₂ is transmitted to the second compression spring 14 ₂ , the intermediate lever 8 and the link 9
and is reliably transmitted to the third throttle valve shaft 3 ₃ via the third lever 7 ₃ , thereby causing the three throttle valves 5 ₁ , 5 ₂ ,
5 ₃ will be opened at the same time.

On the contrary, if the first throttle valve shaft ₃₁ is rotated in the direction of the arrow Rc, the rotational force is transferred from the first lever ₇₁ to the connecting piece 7 between the first compression spring ₁₄₁ and _{the second} lever 72.
₂ a to the second throttle valve shaft 3 ₂ , and at the same time, from the connecting piece 7 ₂ a of the second lever 7 ₂ to the second adjusting screw 10 ₂ , the intermediate lever 8 , the link 9 and the third
It is reliably transmitted to the third throttle valve shaft ₃₃ via the lever ₇₃ , whereby the three throttle valves ₅₁ , ₅₂ , ₅₃ are closed simultaneously.

When opening and closing such throttle valves 5 ₁ , 5 ₂ , 5 ₃ , the first,
Even if there is run-out between the second throttle valve shafts 3 ₁ , 3 ₂ and the intermediate shaft 6 due to manufacturing errors, the run-out can be caused by the lateral movement of the first adjusting screw 10 ₁ in the notch hole 11, the clamping plate 12 , 13 and the connecting piece 7 ₂ a, the sliding between the second adjusting screw 10 ₂ and the connecting piece 8 ₂ a, etc., so that the opening and closing described above is performed smoothly.

If the throttle valves 5 ₁ , 5 ₂ of the first and second main carburetors C ₁ , C ₂ are out of synchronization, the first adjusting screw 10 ₁
If the first compression spring 14 ₁ is compressed or expanded by turning it clockwise or counterclockwise, the phase between the first and second levers 7 ₁ and 7 ₂ changes, and the first and second throttle valve shafts 3 ₁ , 3 ₂ cause a relative angular displacement, so the throttle valve 5
By matching the opening degrees of ₁ and 5 ₂ , a synchronized state can be obtained.

Furthermore, if the opening ratio of _the throttle valve 5 ₃ of the sub-carburizer C ₃ to the throttle valve 5 ₂ of the second main carburetor C 2 is out of order,
By turning the second adjustment screw 10 ₂ to the right or left, the second compression spring 14 ₂ can be compressed or expanded.
Since the phase between the second lever 7 ₂ and the intermediate lever 8 changes, and the second and third throttle valve shafts 3 ₂ and 3 ₃ undergo relative angular displacement, the opening ratio can be adjusted appropriately. .

Thus, the intermediate lever 8 and the link 9 constitute a link mechanism L of the present invention that is connected to the third lever ₇₃ ,
Also, the first adjustment screw 10 ₁ , both clamping plates 12 and 13,
The first compression spring 14 ₁ and the lock nut 15 ₁ cooperate with each other to interlock the two throttle valve shafts 3 ₁ , 3 ₂ corresponding to the first and second levers 7 ₁ , 7 ₂ and First interlocking mechanism _M1 capable of adjusting relative angular displacement
In addition, a second adjustment screw 10 ₂ and a second compression spring 1
4 ₂ and the lock nut 15 ₂ cooperate with each other to lock both throttle valve shafts 3 ₃ , which correspond to the third and second levers 7 ₃ , 7 ₂ .
3. A _second interlocking mechanism _M2 is constructed which can interlock the two and adjust the relative angular displacement between them.

In this embodiment, the operating lever 4 is attached to the first throttle valve shaft ₃₁ .
Although the throttle valve shaft is set as the drive side by fixing the throttle valve, the second throttle valve shaft 3 ₂ or the third throttle valve shaft 3 ₃ can also be set as the drive side.

In Fig. 3, 16 ₁ and 16 ₂ are variable bench lily pistons provided in the intake passages 1 ₁ and 1 ₂ , and 17 is the intake passage 1.
The fixed bench lilies 18 ₁ and 18 ₂ formed in ₃ are negative pressure chambers for controlling the vertical movement of the variable bench lily pistons, 1
9 ₁ to 19 ₃ are float chambers.

As described above, according to the present invention, the first and second main carburetors are disposed such that their throttle valve shafts are aligned on the same axis, and the first and second main carburetors are arranged in the middle of the two main carburetors and the throttle valve shafts are arranged on the same axis. an auxiliary carburetor is disposed below the auxiliary carburetor, and a throttle valve shaft of the auxiliary carburetor is arranged parallel to both throttle valve shafts;
Since a throttle valve interlocking device for interlocking the throttle valve shafts of the three carburetors is installed between the three carburetors, the three carburetors can be placed close to each other without being interfered with by each other's throttle valve shafts. In addition, the throttle valve interlocking device can be centrally installed in one location, and as a result, a compact torch-ignited multiple carburetor for a multi-cylinder internal combustion engine can be obtained. Moreover, the above-mentioned arrangement allows the auxiliary carburetor, which is generally set to supply a small amount of air-fuel mixture, to occupy a central position in the direction of the arrangement of the engine's cylinders, thereby ensuring even distribution of the air-fuel mixture to the auxiliary combustion chambers of each cylinder. is good.

Further, the throttle valve interlocking device includes first and second levers fixed to one and the other of opposing ends of the throttle valve shafts of the first and second main carburetors, respectively, and a throttle valve shaft of the auxiliary carburetor. A third lever fixed to an end portion is provided between the first lever and the second lever to interlock the two throttle valve shafts corresponding to the two levers and to control the relative angular displacement between them. an adjustable first interlocking mechanism, a linkage mechanism connected to the third lever, and the second lever, interlocking the throttle valve shafts corresponding to the two levers, and interlocking the throttle valve shafts corresponding to the two levers; and a second interlocking mechanism that can adjust the relative angular displacement of the first and second main carburetors. The throttle valve shafts of the three carburetors are interlocked with each other by a second interlocking mechanism, and the relative angular displacement is arbitrarily adjusted. It is possible to always link accurately with the adjusted state. Moreover, since the second lever can function as a common interlocking link for the first and second interlocking mechanisms, the structure of the interlocking device can be made simpler and smaller, which can contribute to cost reduction.
The interlocking device can be easily installed even in a relatively narrow space between the three vaporizers.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a torch-ignited multi-cylinder internal combustion engine equipped with the multiple carburetor of the present invention, FIG. 2 is an enlarged plan view of the multiple carburetor, FIG. 3 is a front view thereof, and FIG. 4 5 is a sectional view taken along the line -- in FIG. 2, FIG. 5 is a sectional view taken along the line -- in FIG. 4, and FIG. 6 is an exploded perspective view of the throttle valve interlocking device in the multiple carburetor. A... Air cleaner, a... Sub-combustion chamber, C... Multiple carburetor, C ₁ , C ₂ ... First and second main carburetor, C ₃ ... Sub-carburetor, E... Torch ignition multi-cylinder internal combustion engine, E ₁ ~
E ₄ ...1st to 4th cylinder, I...interlocking device, M ₁ ...1st
interlocking mechanism, M ₂ ...second interlocking mechanism, L...link mechanism, M...intake manifold, m...main combustion chamber, S
...stay plate, 1 ₁ to 1 ₃ ... intake tract, 2 ₁ to 2 ₃
... Carburetor main body, 3 ₁ - 3 ₃ ... 1st - 3rd throttle valve shaft, 4
...Operating lever, 5 ₁ - 5 ₃ ... Throttle valve, 7 ₁ - 7 ₃ ... 1st
~3rd lever, 8... intermediate lever, 9... link, 1
0 ₁ , 10 ₂ ...first and second adjustment screws, 14 ₁ , 14 ₂
...First and second compression springs, 16 ₁ , 16 ₂ ... Variable bench lily piston, 17... Fixed bench lily.

Claims (1)

[Claims] 1 Main combustion chamber m of torch-ignited multi-cylinder internal combustion engine E
The first and second main carburetors C ₁ supplying the mixture to the
C ₂ is arranged so that the throttle valve shafts 3 ₁ and 3 ₂ are aligned on the same axis, and is located between the two main carburetors C ₁ and C ₂ and between the throttle valve shafts 3 ₁ and 3 ₂ . At the bottom, there is a auxiliary carburetor C ₃ that supplies the air-fuel mixture to the auxiliary combustion chamber a of the engine E.
In addition, the throttle valve shaft 3 ₃ of this auxiliary carburetor C ₃
is arranged parallel to the throttle shafts 3 ₁ , 3 ₂ of the main carburetors C ₁ , C ₂ , and interlocks the throttle valve shafts 3 ₁ to 3 ₃ of the three carburetors C ₁ to _{C 3} to mutually interlock them. Apparatus I is the three vaporizers
The throttle valve interlocking device I is installed between _C1 and _C3 , and the throttle valve interlocking device I is connected to one and the other of the opposite ends of the throttle valve shafts ₃₁ and _{32 of} the first and second main carburetors C1 _{and C2} . The first one that was fixed on each
and the second levers 7 ₁ , 7 ₂ , the third lever 7 ₃ fixed to the end of the throttle valve shaft 3 ₃ of the auxiliary carburetor C ₃ , and the first lever 7 ₁ and the second lever 7 ₂ . Both throttle valve shafts 3 are provided between the two and correspond to the two levers 7 ₁ , 7 ₂ .
A first interlocking mechanism M1 that interlocks the _two levers ₁ and ₃ and can adjust the relative angular displacement between them, a link mechanism L connected to the third lever ₇₃ , and the second lever ₇₂ . provided between the two levers 7 ₃ ,
A second throttle valve shaft 3 ₃ , 3 ₂ corresponding to 7 ₂ can be interlocked with each other and the relative angular displacement therebetween can be adjusted.
A multiple carburetor for a torch-ignited multi-cylinder internal combustion engine, characterized by comprising an interlocking mechanism _M2 . 2. In what is stated in claim 1,
The first and second main carburetors C ₁ and C ₂ are variable bench lily type carburetors, and the auxiliary carburetor C ₃ is a fixed bench lily type carburetor, a torch-ignited multiple carburetor for a multi-cylinder internal combustion engine. .