JPS61145349A - Device for preventing carburetor from icing - Google Patents

Abstract

PURPOSE:To prevent a carburetor from icing in forming mixture gas by installing a rectifier and charging control equipments provided in circuitry disposed between a dynamo and a battery, in the vicinity of mixture gas formation part of the carburetor. CONSTITUTION:A rectifier 7 serving to rectify a current from a dynamo produces heat in engine operation. The rectifier 7 is disposed on the side surface of the mixture gas formation part 3 of a carburetor 1. Hereby, the interior of the carburetor is warmed by heat produced from the rectifier, whereby icing is prevented from being produced upon mixture gas formation, and hence a throttle valve 4 of sliding type can be prevented from choke of operation together with prevention of any clogging of a nozzle. Moreover, since electric elements such as the rectifier is cooled by the mixture gas, overheating thereof can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an antifreeze device for a carburetor in an internal combustion engine.

[Prior art]

Carburetors installed in vehicles such as motorcycles and snowmobiles for cold regions are equipped with electric heaters to prevent water in the air-fuel mixture from freezing.

However, this electric heater consumes a large amount of power, placing a heavy burden on the power supply, and in order to cope with this, it is necessary to increase the capacity of the generator and battery.

[Purpose of the invention]

An object of the present invention is to provide a device that makes it possible to prevent freezing of a vaporizer without requiring a large-capacity generator or battery.

[Structure of the invention]

The present invention, which achieves the above object, is characterized in that a heat-generating electronic device such as a rectifier and a charging controller provided between a generator and a fuel tank is attached to a mixture forming part of a carburetor.

〔Example〕

The present invention will be explained below with reference to embodiments shown in the drawings.

In FIGS. 1 and 2, l is a vaporizer equipped with the antifreeze device of the present invention. This carburetor 1 has a float chamber 2 at the bottom for storing fuel, and a venturi section 3 at the top.
An intake passage 3 is formed by a. A piston valve 4 for changing the ventilation cross-sectional area is provided in the intake passage 3 so as to be movable up and down, and a needle valve 5 is fixed to the lower end of the piston valve 4. The needle valve 5 is loosely fitted into a main jet hole 6 communicating with the float chamber 2. The needle valve 5 moves up and down together with the piston valve 4, and as it moves upward, the opening area of the main jet hole 6 becomes larger and the amount of fuel injection increases. That is, the intake passage 3 formed by the venturi portion 3a serves as a fuel-air mixture forming portion. A mounting seat 9 is provided on the side corresponding to the intake passage 3 serving as the air-fuel mixture forming portion, and a rectifier 7, which will be described later, is fixed to the mounting seat 9 with bolts 8.

In the battery charging circuit shown in FIG. 3, 10 is a generator driven by an engine 11. This generator 10
The above-mentioned rectifier 7 is connected to. The rectifier 7 rectifies the AC power generated by the generator 10 into DC power, and also adjusts the voltage.

The current is adjusted to charge the battery 12, and is also supplied to other DC loads such as headlamps (not shown). Further, a starting motor 13 is connected to the battery 12,
The engine 11 is started by being driven by electric power from the battery 12 via a start switch 14 and a relay 15.

The rectifier 7 has the same known configuration in which the rectifying section and the control section are made of semiconductors, and generates a large amount of heat when performing the above-mentioned rectifying and controlling functions. Therefore, by being attached to the mixture forming part of the carburetor 1 as described above, the rectifier 7 functions as a heater for the mixture forming part and prevents the moisture in the mixture from freezing. Can be done.

Further, since the semiconductor of the rectifier 7 itself is cooled by heat exchange with the air-fuel mixture, overheating is prevented and its life can be extended.

Therefore, in the above device, freezing can be prevented without providing a special electric heater to the vaporizer 1, and since no electric heater is provided, a generator with a particularly large capacity or a buff battery is not required.

〔Effect of the invention〕

As described above, the present invention has a configuration in which heat-generating electronic devices such as a rectifier and a charging controller provided between a generator and a battery are attached to the mixture forming part of the carburetor. The heat generated by the equipment during its rectification and control actions can prevent the moisture in the mixture from freezing.

Therefore, there is no need to provide a special electric heater in the conventional device, and there is no need to increase the capacity of the generator or battery.

[Brief explanation of the drawing]

Fig. 1 is a front view of a carburetor equipped with the antifreeze device of the present invention, Fig. 2 is a partial sectional view of the vaporizer seen from the ■ arrow direction in Fig. 1, and Fig. 3 is a front view of the vaporizer equipped with the antifreeze device of the present invention. FIG. 3 is a charging circuit diagram including an installed rectifier. DESCRIPTION OF SYMBOLS 1... Carburetor, 3... Intake passage, 4... Piston valve, 5... Needle valve, 6... Main jet hole,
7... Rectifier, 10... Generator, 11... Engine, 12... Battery.

Claims (1)

[Claims] 1. A carburetor antifreeze device characterized in that a heat-generating electronic device such as a rectifier and a charging controller provided between a generator and a battery is attached to a mixture forming part of the carburetor.