JPS63623B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides at least one pair of adjacent carburetors that are arranged in a twisted relationship with each other such that their intake tract center lines are twisted around an arbitrary straight line orthogonal to both center lines. The present invention relates to a connecting device for integrally connecting both the carburetors in the type of multiple carburetor.

Conventionally, a common multiple carburetor connection device bridges the carburetors with a highly rigid connection plate in order to increase the connection rigidity between the carburetors, and each carburetor and the connection plate are fixed at multiple locations with screw members. are doing. When such a connecting device is applied to the above-mentioned type of multiple carburetor, it is necessary to use a connecting plate that is complex in shape and heavy, which causes problems of increased cost and weight of the multiple carburetor.

The present invention has been proposed in view of the above, and it eliminates the conventional connecting plate between the carburetors, reduces the number of screw members used, and also makes the structure of each carburetor common, resulting in light weight and connection rigidity. It is an object of the present invention to provide a connecting device for multiple vaporizers of the type described above, which has a high efficiency, has a simple structure, and is inexpensive.

In order to achieve the above object, the present invention arranges at least one pair of adjacent carburetors so that their intake passage center lines are twisted around an arbitrary straight line perpendicular to both center lines, and are twisted to each other. In the arranged multiple carburetors, a plurality of sets of connection bosses and a set of positioning bosses whose tips abut each other are integrally molded on the opposing surfaces of both the carburetors, and
The plurality of sets of connecting bosses are symmetrical with respect to a bisector of the angle formed by both the intake duct center lines when viewed from the direction of the torsion center line, and the one set of positioning bosses are arranged on the bisector The connecting bosses of each set are connected to each other by screwing and tightening a screw member inserted into one of the connecting bosses to the other, and one set of positioning bosses is fitted and inserted across both of the connecting bosses. They are positioned by positioning pins, and a pair of levers connected to the throttle valve shafts of both carburetors are rotatably fitted and supported by the pair of positioning bosses, and a is characterized in that a tuning device is provided that synchronizes both the throttle valve shafts by interlocking them.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. In Fig. 1, E is a V-type internal combustion engine mounted on a motorcycle, and has a front cylinder Ef and a rear cylinder Er arranged in a V-shape. , V between them
A multiple vaporizer C is arranged in the character-shaped space.

The multiple carburetor C is the first carburetor installed in the rear cylinder Er.
It consists of a carburetor C ₁ and a second carburetor C ₂ attached to the front cylinder Ef, and both carburetors C ₁ and C ₂ are connected to the cylinders E ₁ and E _2.
They are arranged in the following relationship in relation to the V-shaped arrangement.

That is, as shown in FIGS. 2 to 4, the first
and the second carburetors C ₁ and C ₂ are arranged such that their intake duct center lines O ₁ and O ₂ are twisted at a predetermined angle with respect to each other with an arbitrary straight line orthogonal to both center lines as the torsion center line A. Ru.

The first and second carburetors C ₁ and C ₂ include carburetor bodies 1 ₁ and 1 ₂ having intake passages 2 ₁ and 2 ₂ , respectively, and floats coupled to the lower surfaces of these carburetor bodies 1 ₁ and 1 ₂ . It consists of chamber bodies 3 ₁ and 3 ₂ , and both carburetor bodies 1
A pair of _positioning bosses 4 ₁ , 4 ₂ and two pairs of connecting bosses 5 ₁ , 5 ₂ , ; 5 ₁ , 5 ₂ are protrudingly provided on opposing side surfaces of the bearings ₁ , 1 2 . In this case, the positioning bosses 4 ₁ and 4 ₂ are arranged at angles formed by the intake passage center lines O ₁ and O ₂ when viewed from the direction of the torsion center line A.
That is, it is placed on the bisector B of the torsion angle θ, and 2
The sets of connecting bosses 5 ₁ , 5 ₂ ; 5 ₁ , 5 ₂ are arranged in a symmetrical relationship with respect to the bisector B. These bosses are integrally molded onto the corresponding carburetor body.

Positioning holes 6 ₁ , 6 ₂ are provided in each end face of the positioning bosses 4 ₁ , 4 ₂ , and one positioning pin 7 is fitted into these holes. On the other hand, the first vaporizer C ₁
The connecting boss 5 ₁ of the second carburetor C ₂ and the connecting boss 5 ₁ of the second carburetor C 2 have through holes 8, 8, and the connecting boss 5 ₂ of the first carburetor C ₁ and the connecting boss 5 ₂ of the second carburetor C ₂ are provided with screw holes 9, 9 that communicate with the through holes 8, 8, respectively, and each assembly is completed by screwing and tightening a screw member 10 such as a screw or bolt inserted into each through hole 8 into the screw hole 9. The connecting bosses 5 ₁ , 5 ₂ ; 5 ₁ , 5 ₂ are fixed to each other. Thus, the first and second vaporizers C ₁ ,
C ₂ is firmly connected via the connection bosses 5 ₁ , 5 ₂ ; 5 ₁ , 5 ₂ . In addition, the first and second carburetors C _{1 and C 2 are} equipped with positioning bosses 4 ₁ and 4 ₂ and connecting bosses 5 ₁ and 5 _{2 .}
The structure of will be standardized.

Throttle valve shafts 12 _{1 and} 12 ₂ that support the throttle valves 11 ₁ and 11 ₂ in the intake passages _{2 1} and 2 ₂ are rotatably supported in the carburetor bodies C 1 and C 2, respectively. An opening/closing pulley 15 to which a valve opening wire 13 and a valve closing wire 14 are connected is fixed to the outer end of the throttle valve shaft 12 ₁ of C ₁ . Both wires 13 and 14 are pulled alternately by rotation of a throttle grip (not shown) of the motorcycle.

Throttle valve shafts 12 ₁ and 12 ₂ of both carburetors C ₁ and C ₂ are connected via an interlocking device 16 . This interlocking device 16
are connected to the first lever fixed to the inner end of the throttle valve shaft 12 ₁ of the first carburetor C ₁ and to the outer peripheries of the positioning bosses 4 ₁ and 4 ₂ via synthetic resin collars 18 ₁ and 18 ₂ respectively. Second and third levers 17 rotatably supported
₂ , 17 ₃ , the fourth lever 17 ₄ fixed to the inner end of the throttle shaft 12 ₂ of the second carburetor C ₂ , and the pin joint 19 ₁ , ₁ between the first and second levers 17 ₁ , 17 2.
A pin joint 1 is connected between the first link 20 ₁ connected via 9 ₂ and the third and fourth levers 17 ₃ and 17 ₄ .
a second link 20 ₂ connected via 9 ₃ and 19 ₄ ;
It is composed of a tuning device 21 that connects the second and third levers 17 ₂ and 17 ₃ , and the first lever 17 ₁ ,
The first link 20 ₁ and the second lever 17 ₂ constitute a parallel link mechanism, and the third lever 17 ₃ , the second link 20 ₂ and the fourth lever 17 ₄ constitute a reverse operation link mechanism.

As shown in FIG. 5, the tuning device 21 includes a U-shaped connecting arm 2 integrally formed with the second lever ₁₇₂ .
2 and an L-shaped connecting arm 23 formed integrally with the third lever 17 ₃ and inserted into the U-shaped connecting arm 22.
3 is an adjustment screw 24 screwed onto the U-shaped connecting arm 22;
The second and third levers 17 ₂ and 17 ₃ are held in the rotating direction by the spring 25 and the spring 25 contracted within the arm 22 .

Furthermore, the throttle valves 11 ₁ , ₁ are attached to the throttle valve shafts 12 ₁ , 12 2 .
Valve closing springs 26 ₁ and 26 ₂ made of torsion coil springs biasing in the closing direction of 1 ₂ are connected, respectively.

Thus, by adjusting the adjustment screw 24 forward and backward relative to the L-shaped connecting arm 23, the second and third levers 17 ₂ ,
17 ₃ is adjusted, and thereby the opening degrees of the throttle valves 11 ₁ and 11 ₂ of the first and second carburetors C ₁ and C ₂ can be synchronized.

Figures 3 and 4 show a state in which the throttle valves 11 ₁ and 11 ₂ are closed to the idle opening degree. From this state, the valve opening wire 13 is pulled and the opening/closing pulley 15 is moved to the direction indicated by the arrow in Figure 3. When rotated in the direction, the throttle valve shaft 12
₁ rotates together with the throttle valve 11 ₁ of the first carburetor C ₁
directly open. Further, the rotation of the throttle valve shaft 12 ₁ is performed by the first lever 17 ₁ , the first link 20 ₁ , the second lever 17 ₂ , the tuning device 21 , the third lever 17
_3. It is transmitted to the throttle valve shaft 12 ₂ of the second carburetor C ₂ via the second link 20 ₂ and the fourth lever 17 ₄ , so that
The throttle valve 11 ₂ of the second carburetor C ₂ is also opened at the same time.
On the other hand, it is clear from the above operation that if the valve closing wire 14 is pulled, both the throttle valves 11 ₁ and 11 ₂ can be closed simultaneously.

As described above, according to the present invention, at least one pair of adjacent carburetors are arranged so that their intake tract center lines are twisted with respect to an arbitrary straight line orthogonal to both center lines, and the torsion center line is set as the torsion center line. In the multiple carburetor, a plurality of sets of connection bosses whose tips abut each other and a set of positioning bosses are integrally molded on opposing surfaces of both the carburetors, and the plurality of sets of connection bosses are aligned with the torsion center line. The one set of positioning bosses are arranged in a symmetrical relationship with respect to the bisector of the angle formed by the center lines of both intake ducts when viewed from the direction of A screw member inserted into one is screwed and tightened into the other to connect them, and a pair of positioning bosses are
Since the two carburetors are positioned via a positioning pin that is fitted across both, it is possible to properly connect the two carburetors without using a connecting plate separate from the carburetor as in the past. , it is possible to simplify the connection structure and reduce the weight of the entire multiple carburetor. Moreover, since the connecting boss and the positioning boss are integrally molded with the corresponding carburetor, the rigidity of the root of each boss is particularly high, and as a result,
The rigidity of the connection between both carburetors can be increased, and since the screw member simply fixes between the connection bosses, one screw member is sufficient for each set of bosses, and the number of screw members used can be reduced by using a connection plate. The number of parts is extremely small compared to conventional ones, so assembly work can be easily performed. Further, the plurality of sets of connecting bosses are arranged symmetrically with respect to a bisector of the angle formed by the center line of the intake tract of both the carburetors when viewed from the direction of the torsion center line, and one set of positioning bosses are arranged in the same direction. Since they are arranged on separate lines, it is possible to achieve a common structure for each carburetor, and therefore, two carburetors with the same structure, each having a connecting boss and a positioning boss, can be connected to the corresponding boss. A multiple carburetor can be obtained by assembling them so as to butt each other, and since the connecting plate is omitted, the multiple carburetor can be provided at a low cost.

In particular, a pair of levers connected to the throttle valve shafts of both the carburetors are rotatably fitted and supported in one set of positioning bosses, and between the two levers, a pair of levers are connected to each other so that the two throttle valves Since a tuning device for synchronizing the shafts is provided, the positioning bosses located on the bisector of the angle formed by the center lines of both intake ducts are also used as intermediate shafts of the synchronization interlocking mechanism between the two throttle valve shafts,
This can contribute to the simplification of the structure, and moreover, the synchronization interlocking mechanism can be arranged in a well-balanced manner on both sides of the bisector, without being biased toward the center line of the intake tract of one carburetor. .

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a side view of an internal combustion engine equipped with multiple carburetors connected by the coupling device of the present invention, and FIG. 2 is a side view of an internal combustion engine equipped with multiple carburetors connected by the coupling device of the present invention. 3 is a front view of the multiple carburetor, FIG. 3 is a sectional view taken along the line -- in FIGS. 2 and 4, FIG. 4 is a front view of the multiple carburetor mainly showing the interlocking device of the throttle valve, and FIG. It is a V arrow view of a figure. A...twist center line, B...bisector, C...multiple carburetor, _C1 , _C2 ...first, second carburetor, _O1 , _O2 ...intake tract center line, θ...twist angle, 4 ₁ , 4 ₂ ... positioning boss, 5 ₁ , 5 ₂ ... connection boss, 7 ... positioning pin, 8
...Threaded hole, 9...Screw hole, 10...Screw member, 12 ₁ ,
12 ₂ ... throttle valve shaft, 17 ₁ , 17 ₂ ... lever, 21 ...
Tuning device.

Claims (1)

[Claims] 1 At least one pair of adjacent vaporizers C ₁ and C ₂ ,
Those intake tract center lines O ₁ and O ₂ are both center lines O ₁ ,
In a multiple carburetor arranged in a twisted relationship with each other with an arbitrary straight line orthogonal to O ₂ as the torsion center line A, a plurality of sets of carburetors C ₁ and C _{2 whose tips abut each other are placed on the opposing surfaces of both the carburetors C 1 and C 2} . connecting bosses 5 ₁ , 5 ₂
and one set of positioning bosses 4 ₁ , 4 ₂ are integrally molded, and the plurality of sets of connecting bosses 5 ₁ , 5 ₂ are aligned with both the intake passage center lines when viewed from the direction of the torsion center line A.
The positioning bosses 4 ₁ and 4 ₂ of the pair are symmetrical with respect to the bisector B of the angle formed by O ₁ and O ₂ .
The connecting bosses 5 ₁ , 5 ₂ of each pair are arranged on the equal dividing line B, and are connected to each other by screwing and tightening the screw member 10 inserted into one of the connecting bosses 5 1 and 5 2 to the other. The bosses 4 ₁ , 4 ₂ are positioned with respect to each other via a positioning pin 7 that is fitted across both of them, and the pair of positioning bosses 4 1 , 4 ₂
4 ₂ includes the throttle valve shafts 12 ₁ , 1 of the carburetors C ₁ , C ₂ .
A pair of levers 17 ₂ , 17 ₃ connected to 2 ₂ respectively
are rotatably fitted and supported, and both levers 17 ₂ ,
17 ₃ is provided with a tuning device 21 that synchronizes both the throttle valve shafts 12 ₁ and 12 ₂ by interlocking therebetween.