Flow control device of a helically-shaped intake port for use in

Internal-combustion engines – Valve – Valve head cooperates with manifold

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123308, F02M 3510

Patent

active

044730403

ABSTRACT:
A helically-shaped intake port comprising a helical portion formed around an intake valve, and a substantially straight inlet passage portion tangentially connected to the helical portion. A bypass passage is branched off from the inlet passage portion and connected to the helical portion. A slide valve is arranged in the bypass passage and controlled by a stepper motor so that the opening area of the slide valve changes in proportion to the amount of air to be fed into the cylinder of the engine.

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patent: 4256062 (1981-03-01), Schafer
patent: 4257384 (1981-03-01), Matsumoto
patent: 4312309 (1982-01-01), Nakanishi et al.
patent: 4347816 (1982-09-01), Saito et al.

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