JPH0326296Y2 - - Google Patents

Description

[Detailed description of the invention] The invention relates to a fuel vaporization device in which a carburetor equipped with a butterfly-type throttle valve that opens and closes an air passage is connected to an engine intake hole through a heat insulator. .

Conventionally, in this type of fuel vaporizer, the second
As shown in the figure, in order to prevent the heat of the engine 3 from being transferred to the carburetor 9, the carburetor 9 is
is communicated with the intake hole 7 of the engine 3. The idle nozzle port 43 opens in the air passage 13 of the carburetor 9 immediately after the throttle valve 15 is in the closed position (to the right in the figure).

For this reason, the distance required from the idle nozzle opening to the inner surface of the cylinder during idle rotation increases, and during idle rotation when the flow velocity is low, the fuel is not completely vaporized, and it liquefies and accumulates on the bottom of the intake hole. When the attitude of the engine changes, the accumulated fuel may be sucked in all at once, causing problems in engine operation such as a reduction in rotation or stopping.

This invention opens the idle nozzle port near the intake hole of the engine, shortens the distance between the idle nozzle port and the inner surface of the cylinder, and immediately draws the fuel ejected from the idle nozzle port into the cylinder. This prevents fuel from liquefying and accumulating inside the engine, allowing the engine to operate smoothly.Moreover, there is no need for troublesome modifications to the engine intake hole, and it can be easily applied to existing engines. The present invention aims to provide a fuel vaporization device that can be used and easily manufactured.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a cylinder of an engine 3, into which a piston 5 is slidably fitted to open and close an intake hole 7. A carburetor 9 communicates with the intake hole 7 via a synthetic resin heat insulator 11, and is provided with a butterfly-type throttle valve 15 for opening and closing an internal air passage 13. An air cleaner 17 communicates with the vaporizer 9 and filters the air sucked through the vent holes 19, 19, . 23 is a gasket between the heat insulator 11 and the cylinder 1. Reference numeral 25 indicates a main nozzle opening that opens into the ventilate portion 27 of the air passage 13, and 29 and 31 indicate auxiliary nozzles provided immediately before the closed position of the throttle valve 15 provided in the air passage 13 behind the ventilate portion 27 (to the right in the figure). At the mouth, respectively, the fuel chamber 3 in the carburetor 9
It is connected to 5. The fuel chamber 35 stores fuel supplied from a fuel tank (not shown) by a fuel pump (not shown). 37 fits into the rear end position of the air passage 13 of the carburetor 9 and
It is a ring-shaped intermediate body that is removably sandwiched between 1 and 1. A fuel passage 38 is provided that passes through the intermediate body 37 and communicates with the fuel chamber 35, and communicates with an opening 39 in the inner diameter surface of the intermediate body 37. One end of a nozzle pipe 41 is engaged with the opening 39, the nozzle pipe 41 passes through the inner diameter hole of the heat insulator 11, and the idle nozzle port 43 at the tip opens near the intake hole 7 of the cylinder 1. .

In the above embodiment, the atmosphere is the vent hole 19,1
9, ... into the air cleaner 17, passes through the filter 21, and enters the air passage 13 of the carburetor 9.
During high-speed rotation, fuel is ejected from the main nozzle port 25 that opens in the ventilate portion 27, vaporizes, mixes with air, and is sucked into the engine 3. During low speed rotation, the throttle valve 15 is appropriately throttled, and the engine 3 rotates at low speed due to the fuel jetted from the auxiliary nozzle ports 29 and 31. When the throttle valve 15 is further throttled and idle speed is reached, fuel is ejected from the idle nozzle port 43, vaporized, and immediately transferred to the engine 3.
Since it is sucked into the air, it does not liquefy or accumulate on the bottom of the intake hole 7.

Since the present invention has the configuration as described in the claims, fuel does not liquefy or accumulate in the intake hole during idling, and fuel is supplied at once even if the engine position changes. This allows the engine to operate smoothly.

Further, there is no need to change the design of the engine intake hole 7, which is complicated, and the fuel passage 38 only needs to be communicated with the carburetor, and the nozzle pipe 41, which is difficult to install, can be easily attached to the intermediate body 37, which has a simple structure. In addition, since the nozzle pipe 41 is passed through the inner diameter hole of the heat insulator 11, the structure is simple and easy to assemble, and if it is replaced with a simple annular intermediate body without the fuel passage 38 and nozzle pipe 41, the normal It can be used as a vaporizer.

Note that the intermediate body 37 of the present invention may be formed integrally with the heat insulating body 11, or may also be used as the heat insulating body 11.

In FIG. 2, the same reference numerals as those shown in FIG. 1 represent the same components.

It should be noted that the present invention is not limited to the above-mentioned embodiments, but can be implemented in other embodiments as well. Further, the symbols shown in the claims do not limit the technical scope of the present invention.

[Brief explanation of drawings]

FIG. 1 is an explanatory side sectional view of one embodiment of the present invention, and FIG. 2 is an explanatory side sectional view of a conventional device. Explanation of the symbols representing the main parts of the drawing, 3...
Engine, 7... Intake hole, 9... Carburetor, 11...
...Insulator, 13...Air passage, 15...Throttle valve, 35...Fuel chamber, 37...Intermediate body, 38...
...fuel passage, 39...opening, 41...nozzle pipe.

Claims (1)

[Scope of utility model registration request] A carburetor 9 equipped with a throttle valve 15 for opening and closing an air passage 13 is connected to the engine 3 via a heat insulator 11.
In the fuel vaporization device provided in communication with the intake hole 7 of the fuel passage 38, one end of the fuel passage 38 is connected to the fuel chamber 35, and the other end thereof is connected to an annular ring fixed between the rear end of the air passage 13 and the heat insulator 11. The opening 39 is provided in communication with the opening 39 that opens on the inner diameter surface of the intermediate body 37, and the opening 39
A fuel vaporization device characterized in that a nozzle pipe 41 is provided with one end communicating with and fixed to the insulator 11, passing through an inner diameter hole of the heat insulator 11, and having the other end open near the intake hole 7.