JPS6313408Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a starting device in which the starting mixture passage of one starting device is branched and communicated with each carburetor of a multiple carburetor, and in particular, the starting device is connected in series in the upper and lower directions. This relates to the connection order when branching and connecting the starting mixture passage to the carburetor.

To explain conventional starting devices, for example,
As shown in Publication No. 48-9831 and Japanese Patent Application No. 57-134018 (filed by the present applicant), 1
Starting air-fuel mixture passages were branched and communicated from each starting device to multiple carburetors. In particular, when such a starting mixture passage is branched to multiple carburetors connected in the upper and lower directions, in the upper carburetor, the starting mixture is mixed due to the head difference between the starting device and the carburetor. Insufficient suction occurred, and in the carburetor located below, the starting air-fuel mixture became too rich or too rich due to the head difference. As a result, the distribution amount and air-fuel ratio of the starting air-fuel mixture supplied to each cylinder of the engine corresponding to the multiple carburetor become uneven, resulting in engine suffocation and
This resulted in starting problems such as stopping or difficulty in starting.

The present invention has been developed in view of the above points, and the purpose is to provide a starting mixture passage with a branch opening near the starting valve. Connect to the top vaporizer,
In addition, by connecting the other branch port to the lower carburetors in sequence according to the distance from the starting valve, the starting air-fuel mixture is evenly distributed to each of the carburetors connected in the vertical direction, and the engine An object of the present invention is to provide a starting device for a multiple carburetor with excellent starting performance.

An embodiment of the present invention will be explained with reference to FIG.
This shows an example in which a single starting device is used in common for triple carburetors that are connected in the vertical direction, and a starting mixture passage 4 whose opening and closing are controlled by a starting valve 3 of the starting device 1 is shown. In other words, the throttle valves 5 of the three upper, middle, and lower carburetors 2 are branched into communication with connection ports A, B, and C of the engine side intake passage, respectively. The starting device 1 adjacent to the carburetor 2 in the middle stage has a starting mixture that supplies the engine with a mixture of fuel ejected from the fuel chamber 6 through the fuel pipe 7 and air flowing in from the air passage 8. An air passage 4 is arranged. The starting valve 3, which controls the opening and closing of the starting mixture passage 4, is biased in the closing direction by the force of a spring 9, and is operated for starting by manually moving the operating rod 10 upward. This opens the air-fuel mixture passage.

A distributor 11 is arranged adjacent to the starter 1, and includes a mixture inlet 12, a first branch port 13, a second branch port 14, and a third branch port in order from the one closest to the starter valve 3. A branch port 15 is arranged, the first branch port 13 is connected to the connection port A of the upper vaporizer, and the second branch port 1 is connected to the connection port A of the upper vaporizer.
4 goes to the middle position carburetor connection port B, third branch port 1
5 are respectively connected to the connection port C of the lower carburetor by a pipe (not shown) or the like.

Note that another embodiment of the distributor 11 will be explained with reference to FIG. 2.
3. A second branch port 14 and a third branch port 15 are provided, the first branch port 13 to the connection port A of the upper vaporizer, the second branch port 14 to the connection port B of the middle vaporizer, The third branch ports 15 are respectively connected to connection ports C of the lower carburetor.

Further, the distributor 11 may be placed apart from the starting device 1, or the distributor may be omitted and the starting mixture passages may be branched and connected only by pipes.
As for the connection order, it is not necessary to make the vertical order of the carburetor and the branch order of the starting mixture passage all the same; for example, the first branch port 13 and the connection port A, and the second branch port 14 and the connection port C. , a case where the third branch port 15 and the connection port B are connected to each other is also included in the present invention.

To explain the operation, FIG. 1 shows the state after the engine has been warmed up, the starting valve 3 is fully closed by the force of the spring 9, and the starting air-fuel mixture is not being supplied.

To start the engine, manually move the operating rod 10 upward to fully open the starting valve 3 and mix the air flowing in from the air passage 8 with the fuel jetting out from the fuel pipe 7 to create a starting mixture. The starting mixture is supplied from the air passage 4 to the mixture inlet 12 of the distributor 11. The air-fuel mixture that is initially branched in the distributor 11 is supplied from the first branch port 13 through the connection port A to the vaporizer located above. At this time, the mixture pressure at the first branch port is higher upstream than the mixture pressure at the other branch ports, that is, on the atmospheric pressure side near the starter valve, so it is high pressure, and there is a head difference between the carburetor at the upper position and the starter device. This supplements the lack of air-fuel mixture suction. In addition, the mixture supplied from the third branch port 15 to the connection port C of the lower carburetor tends to decrease because the mixture pressure at the third branch port becomes low, and the mixture tends to decrease due to the head difference. , prevent over-concentration. Therefore, above,
The amount of starting air-fuel mixture to each of the middle and lower carburetors becomes uniform, improving distribution and eliminating problems with starting problems and engine stoppages. In addition, in order to distribute the air-fuel mixture more uniformly, the first branch port 13, the second branch port 14,
The design may be designed by appropriately changing the intervals between the third branch ports 15, the inner diameter dimensions, or the lengths of the air-fuel mixture passages after branching to the respective connection ports A, B, and C.

As described above in detail, the present invention includes a starting device 1 that supplies a starting mixture to an engine, and a plurality of carburetors 2 connected in a vertical direction, and whose opening and closing are controlled by a starting valve 3 of the starting device. The starting mixture passage 4 is branched from the throttle valves of the plurality of carburetors to the intake passage on the engine side, and the starting mixture passage 4 is connected to the intake passage on the engine side. and connected to the carburetor, and the other branch ports were sequentially connected to the lower carburetor in accordance with the distance from the starting valve,
It is possible to provide a starting device with excellent engine starting performance by improving the distribution of the starting air-fuel mixture to each carburetor.2
It can also be used for continuous, 4-unit, 6-unit vaporizers, etc.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing one embodiment of the starting device for a multiple carburetor of the present invention, and FIG. 2 is a partial sectional view showing another embodiment of the starting device of the present invention. 1...Starting device, 2...Carburizer, 3...Starting valve, 4...Starting mixture passage.

Claims (1)

[Scope of utility model registration request] a starting device 1 that supplies a starting mixture to the engine;
It is equipped with a plurality of carburetors 2 connected in the vertical direction, and a starting mixture passage 4 whose opening and closing are controlled by a starting valve 3 of a starting device is branched from the throttle valve of the plurality of carburetors to an intake passage on the engine side. The branch port 13 of the starting mixture passage communicates with the starting mixture passage and branches at a position close to the starting valve.
to the uppermost vaporizer, and the other branch port 1
4 and 15 are successively connected to the lower carburetors in accordance with the distance from the starting valve 3.