outboard carburetor

Abstract

The invention relates to a carburetor, in particular to a carburetor for an outboard motor, which comprises a carburetor body, and the carburetor body is respectively provided with an independent main oil circuit system and an idle oil supply system. The invention provides an improved carburetor for outboard motors with more stable idle speed, smaller speed fluctuation, acceleration sensitivity, lower fuel consumption, less difficult processing technology, lower cost, smaller pollutant discharge and lighter weight .

Description

technical field [0001] The invention relates to a carburetor, in particular to an outboard motor carburetor. Background technique [0002] The carburetor of the outboard motor is an important component of the outboard motor (marine engine, marine motor, outboard motor). The performance of the outboard motor is mainly determined by the carburetor of the outboard motor. With the advantages of convenient operation and flexible maneuvering, it is a modern national defense essential equipment for public security patrols and communications. Outboard motors are also widely used in civilian applications. etc. my country's outboard motor industry is very weak, and the overall industrial level is still in the 1970s. At present, only a small number of domestic manufacturers produce outboard motors, and the scale is small, the variety is small, and the product performance is poor. More than 95% of the domestic market depends on imports. There are no national standards or industry stan...

AI Technical Summary

Problems solved by technology

There are no national standards or industry standards for domestically produced outboard motors and parts

In terms of design concept, foreign outboard motors focus on convenient operation and high-speed stimulation. As for pollutant emissions, fuel consumption, process difficulty, structural design cost, performance reliability, and stability, they lack consideration.

However, the foreign JP30Z outboard carburetors also have the above-mentioned problems. The main oil circuit system and the idle speed oil circuit system of the existing outboard carburetor are combined in one oil channel, and the structure of the main oil circuit system It is composed of main metering hole, main air hole, foam pipe and oil channel, etc., and a copper pipe is installed in the foam pipe, and the lower end is the idle speed measuring hole to form the idle speed oiler channel. Since the copper pipe is installed in the foam pipe , one increases the oil outlet resistance of the main oiler, and the other reduces the foaming quality of the foam tube, resulting in insensitivity to acceleration, high fuel consumption, and increased emission of pollutants; and because the center hole of the copper tube is thin and long, the lower end is idle speed Measuring hole, the upper end of the copper pipe forms an acute angle of less than 90° with the air passage in the idle oil circuit, the fuel reaches the center of the idle measuring hole assembly and mixes with the air from the idle air hole on the side, and then passes through the idle speed on the carburetor body The channel of the oil passage reaches the transition hole chamber and the bottom of the mixing ratio screw, and then reaches the idle nozzle after being adjusted by the mixing ratio screw. The idle oil passage of this structure will increase the resistance of the oil passage and the air passage, and the outboard motor cannot start and accelerate at any time. Rapid response to the opening of the throttle, resulting in low sensitivity, unstable idle speed, large speed fluctuations, unsmooth transition, and more pollutant emissions when running at low speeds; at the same time, the transition hole structure of the existing outboard carburetor generally includes The transition hole and the auxiliary processing hole are difficult to process in the existing process and the cost is high. Usually, an auxiliary processing hole is provided at the lower right foot of the rear part of the carburetor body opposite to the transition hole, and then a slender The tool rod passes through the process hole of the lower right foot at the rear of the body to process the transition hole on the opposite arc surface. Since the operation is on the arc surface, the distance and size of the transition holes will be different because the tip of the tool (drill) is easy to drift. As a result, the outboard motor is not easy to start, the transition is not smooth, the speed fluctuates greatly, the emission of pollutants is large, and the product quality is inconsistent.

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