JPH0835446A - Connection mechanism of multiple vaporizers - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the misalignment of the throttle valve between vaporizers due to the thermal expansion of the connecting rod of the multiple vaporizers. [Structure] A multiple lever connecting a drive lever 13 connected to a throttle valve shaft of one carburetor and driven levers 33, 53, 73 connected to throttle valve shafts of other carburetors by a connecting rod. In the carburetor, the connecting rod is divided into at least two rods 91, 92, 93, and at least one of them is on the opposite side to the connecting side of the other connecting rod with respect to each throttle shaft. Connect the levers.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting mechanism for a multiple vaporizer.

[0002]

2. Description of the Related Art In an internal combustion engine having a plurality of carburetors, the valve shafts of the throttle valves of the carburetors must be synchronized with each other and interlocked. Therefore, conventionally, the levers attached to the outer ends of the valve shafts of the respective carburetors are connected by a connecting rod, and one lever is driven as a drive lever, and the other levers are driven through the connecting rod in synchronization. It is configured to be able to. (See Japanese Utility Model Laid-Open No. 2-119946)

[0003]

However, in the above carburetor, the connecting rod thermally expands due to the outside air temperature, the ambient temperature of the engine, etc., and the expansion of the rod causes the throttle valve opening of each carburetor on the driven side to increase. There is a drawback in that the carburetors are out of synchronization due to the displacement with respect to the opening of the drive lever. This misalignment increases as the throttle valve of the carburetor on the side away from the drive lever increases.

For example, as shown in FIG. 4, four carburetors are provided, and a drive lever 132 and driven levers 142, 15 connected to the throttle valve shafts 131, 141, 151, 161.
When the connecting rods 170 and 202 are connected to each other, the connecting rod 1 between the drive lever 132 and the driven lever 142 is connected.
The expansion amount of 71 is dL, the driven lever 142 and the driven lever 1
If the expansion amount of the connecting rod 172 between the two 52 is dM and the expansion amount of the connecting rod 173 between the driven lever 152 and the driven lever 162 is dN, the driven lever 142 is out of synchronization with the drive lever 132 by dL. Lever 152
Is out of synchronization with the drive lever 132 by dL + dM, and the driven lever 162 is dL + dM + with respect to the drive lever.
There is a drawback that the tuning is shifted by dN.

An object of the present invention is to reduce the misalignment of the throttle valve between vaporizers due to the thermal expansion of the connecting rod of the multiple vaporizers.

[0006]

According to the present invention, the connecting rod is divided into at least two parts, and at least one of them is connected to the connecting side of another connecting rod with respect to the throttle shaft. It is characterized by connecting the levers on the opposite side.

[0007]

According to the above construction, one of the connecting rods is connected to the throttle shaft on the side opposite to the connecting side of the other connecting rods, so that the thermal expansion amount of the connecting rods is different from that of the other connecting rods. It is possible to offset the above, and it is possible to reduce the misalignment of the throttle valve of each carburetor.

For example, four carburetors are connected, the drive lever 13 is attached to the throttle valve shaft of the carburetor at one end, and the driven lever 33, the driven lever 53, and the driven shaft are sequentially attached to the throttle shafts of the remaining carburetors from the drive lever 13 side. The lever 73 is attached, and the drive lever 13 and the driven lever 33 and the driven lever 53 and the driven lever 73 are interlocked by a connecting rod 91 and a connecting rod 93 that connect to one side of the lever, and the driven lever 33 and the driven lever 53 are respectively connected. A multiple carburetor in which the connecting rods 91 and 93 are connected to the throttle valve shafts 31 and 51 on the side opposite to the connecting side by a connecting rod 92, and the connecting rods 91, 92 and 93 have substantially the same length. In the case of, each connecting rod 91,
When 92 and 93 respectively extend by dL, the driven lever 3
3 is rotated by dθ with respect to the drive lever 13 in a direction to close the throttle valve 32, and this displacement is transmitted to the driven lever 53 via the connecting rod 92.
Also extends by dL in the same manner, so that each rod 91, 9
The elongations of 2 are canceled by each other, and the rotational deviation of the driven lever 53 is eliminated. Further, the driven lever 73 is the driven lever 53.
Since the synchronization deviation of the connection rod becomes zero, the expansion amount d of the connecting rod 93
The drive lever 13 is rotated by an amount of L, and the opening is displaced by dθ like the driven lever 33. Therefore, the misalignment due to the thermal expansion can be made extremely small only by shifting the driven lever 33 and the driven lever 73 from the drive lever 13 by an opening dθ.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing a quadruple carburetor to which the connecting mechanism of the present invention is applied, and FIG. 2 is a vertical sectional view of a carburetor unit.

The carburetors 1, 3, 5 and 7 have throttle valve shafts 11, 31, 51 and 71, throttle valves 12 and
32, 52, 72 are provided. A drive lever 13 is connected to the throttle valve shaft 11 of the carburetor 1, and the carburetor 3,
Driven levers 33, 53, 73 are connected to the throttle valve shafts 31, 51, 71 of 5, 7 respectively. These driven levers 33, 53, 73 have throttle valve shafts 31, 51,
The first levers 34, 54, 74 are directly connected to the first lever 71, and second levers 35, 55, 75 are connected to the connecting rods, which will be described later.
The second lever 35, 5 is provided between the lever 35, 55, 75.
A spring 3 for elastically biasing the first levers 34, 54, 74 in the closing direction of the throttle valves 32, 52, 72 with respect to 5, 75.
6, 56, 76 are provided, and the second levers 35, 5 are provided.
Tuning screws 37, 57, 77 for engaging the first levers 34, 54, 74 and adjusting the opening of the throttle valves 32, 52, 72 are provided on the motors 5, 75.

The throttle valve shaft 11 of the drive lever 13
To one side and the second lever 35 of the driven lever,
Connection pins 18, 38, 58, 78 are provided on one side of the throttle valve shafts 31, 51, 71 of 55, 75,
The connecting pins 18 and 38 and 58 and 78 are connected by connecting rods 91 and 93, respectively. Further, the second levers 35 and 55 of the driven levers 33 and 53 are provided with connecting pins 39 and 59 on the opposite side of the connecting pins 38 and 58 with respect to the throttle valve shafts 31 and 51.
59 are connected by a connecting rod 92. Therefore, when the drive lever 13 is rotated in the opening direction of the throttle valve 11, the connecting rod 91 moves downward in the figure and the driven lever 33 is rotated. Further, the rotation of the driven lever 33 moves the connection rod 92 which is connected to the opposite side of the driven lever 33 across the connection rod 91 and the throttle valve shaft 31 to the upper side in the drawing, and the driven lever 53.
Rotate. Further, when the driven lever 53 is rotated, the connecting rod 93 connected to one side is moved downward in the drawing to rotate the driven lever 73.

The carburetors 1, 3, 5, 7 are provided with choke valves 20, 40, 60, 80, respectively, and choke levers 22, 42 connected to their valve shafts 21, 41, 61, 81. , 62 and 82 are choke connecting rods 2
4, 44 and 64 are linked together.

Next, the structure of the carburetor will be described by taking the carburetor 1 on the driving side as an example. The other vaporizers 2, 3 and 4 have the same configuration as that of the vaporizer 1, and the description thereof will be omitted. An intake passage 102 is provided through the carburetor body 101, and the upstream side of the intake passage 102 is connected to an air cleaner (not shown).
The downstream side is connected to an intake port of the engine via an intake manifold (not shown). In addition, this intake passage 10
A venturi 103 is provided in the center of the venturi 2, and a choke valve 20 is arranged upstream of the venturi 103 and a throttle valve 12 is arranged downstream thereof. The choke valve 20 and the throttle valve 12 are rotatably provided on the inner wall of the intake passage 102 by the valve shafts 21 and 11.

A float chamber 105 is provided below the intake passage 102. Further, the carburetor body 101 has a main nozzle boss 106 projecting into the float chamber 105.
The main nozzle 107 is provided in the boss 106.
And a main jet 108 is provided at the lower end of the boss 106.
A main well 110 is provided between the main jet 110 and the main jet 108. The upper end of the main nozzle 107 faces the venturi 103 of the intake passage 102, and the fuel flowing from the float chamber 105 into the main well 110 through the main jet 108 is supplied to the intake passage 102 through the main nozzle 107.

Further, the intake passage 1 downstream of the throttle valve 12
The idle port 112 is provided on the inner wall surface of 02.
When the throttle valve 12 is at the idling opening, a bypass port 114 is provided slightly upstream of the peripheral edge of the throttle valve 12. These ports 112, 114 are connected to a slow jet 118 via a slow fuel passage 116. An inlet 120 of the slow jet 118 communicates with the main well 110.

Next, the operation of the above embodiment will be described. For example, assuming that the connecting rods 91, 92, 93 have substantially the same length and the expansion of the connecting rods 91, 92, 93 due to thermal expansion is dL, the driven lever 33 is extended by this expansion dL.
Is rotated in the direction of closing the throttle valve 32 by dθ with respect to the drive lever 13, and the tuning is deviated. This deviation is transmitted to the driven lever 53 via the connecting rod 92 connected to the throttle valve shaft 31 on the side opposite to the connecting rod 91. Since the connecting rod 92 also extends by dL, the respective rods are also extended. The expansions of 91 and 92 are offset each other, and the deviation of the opening degree of the driven lever 53 becomes zero. Further, the driven lever 73 is rotated with respect to the drive lever 13 by the expansion amount dL of the connecting rod 93 because the misalignment of the driven lever 53 becomes zero, and the opening degree is displaced by dθ like the driven lever 33. Therefore, the misalignment due to thermal expansion can be made extremely small only by shifting the driven lever 33 and the driven lever 73 from the drive lever by an angle of dθ.

Further, in FIG. 3, one side of the drive lever 13 and the driven lever 33 are connected by a connecting rod 91, and the driven lever 3
Reference numerals 3, 53 and 73 are for connecting the opposite side of the connecting rod to the throttle valve shafts 31, 51 and 71 by connecting rods 95 and 96, and in this case also, the driven lever 53
The deviation of the opening is zero and the openings of the driven levers 33 and 73 are shifted by dθ, so that the same effect as the embodiment of FIG. 1 can be obtained. Moreover, since the number of connecting pins provided on the driven lever 53 can be reduced, the cost can be reduced.

In the above embodiment, the drive lever 13 is provided on the outer carburetor, but the present invention is not limited to this embodiment and the drive lever 13 is set on the inner carburetor. Also has the same effect.

[0019]

As described above in detail, according to the present invention, the connecting rod is divided into at least two pieces, and at least one of the connecting rods is connected to the other connecting rod with respect to each throttle shaft. Since the lever is connected on the side opposite to the connecting side, the amount of thermal expansion of this connecting rod can be offset, and the deviation of the tuning of the throttle valve of each carburetor can be reduced.

[Brief description of drawings]

FIG. 1 is a side view showing a quadruple vaporizer to which a connecting mechanism of the present invention is applied.

FIG. 2 is a vertical sectional view showing an embodiment of a vaporizer.

FIG. 3 is a vertical cross-sectional view showing another embodiment of the coupling mechanism of the present invention.

FIG. 4 is a side view showing a connection mechanism of a conventional multiple vaporizer.

[Explanation of symbols]

 1, 3, 5, 7 Vaporizer 11, 31, 51, 71 Throttle valve shaft 12, 32, 52, 72 Throttle valve 13 Drive lever 33, 53, 73 Driven lever 91, 92, 93 Connecting rod

Claims (1)

[Claims] 1. A multiple carburetor in which a drive lever connected to a throttle valve shaft of one carburetor and a driven lever connected to a throttle valve shaft of another carburetor are connected by a connecting rod. At least two connecting rods
A connecting mechanism for a multiple carburetor, characterized in that it is divided into two or more parts, and at least one of them is connected to a lever on the side opposite to the connecting side of another connecting rod with respect to the throttle shaft.