Idle air intake control device of engine

Abstract

Disclosed is an idle air intake control device of an engine wherein a bypath (5) connected with an intake route (1) while detouring a throttle valve (2), and a bypass valve (6) for throttling the bypath (5) adjustably are provided in a throttle body (T), and a dust trap (7) for preventing intrusion of dust into the bypass valve (6) from the intake route (1) is provided in the bypath (5). The dust trap (7) is formed, to have a U-shaped section, of a first trap chamber (30) to which the intake route (1)-side trap inlet hole (10) opens, a second trap chamber (31) contiguous to the first trap chamber (30) with a barrier wall (32) interposed therebetween and to which the bypass valve (6)-side trap outlet hole (11) opens, and a reversal chamber (33) for communicating the first and second trap chambers (30, 31) with each other so that the chamber surrounds one end of the barrier wall (32). Consequently, an idle intake control device of an engine equipped with a compact dust trap and exhibiting good dust separation effect can be provided.

Description

technical field [0001] The invention relates to an improvement of an idle air intake control device of an engine. The idle air intake control device of the engine has the following structure: the throttle body has an air intake channel connected with the air intake port of the engine and opens the intake air channel. A closed throttle valve, the throttle body is provided with a bypass and a bypass valve, the bypass bypasses the throttle valve and is connected with the intake passage, and the bypass valve can adjust the throttle of the bypass, The bypass is provided with a dust trap that prevents dust from entering the bypass valve from the intake passage. Background technique [0002] Conventionally, the following two configurations have been known in the above-mentioned engine idle air intake control device: one configuration is that the dust collector is composed of a plurality of passages connected in a crank shape, and the intake air flowing in the bypass passage The di...

AI Technical Summary

Problems solved by technology

[0005] However, in the trap described in Patent Document 1, only the direction of the intake air in the bypass is changed at right angles, and the separation effect of separating dust from the intake air is weak. In addition, in the trap of Patent Document 2 , in order to effectively apply a swirling airflow to the intake air, it is necessary to form a large-diameter swirl chamber in the throttle body, and there is little room for forming this swirl chamber in a small throttle body used for a motorcycle, etc.

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