Denso Corporation

Katsumi Nakashima

Yasushi Kohno

Ryo Nagasaka

Minoru Kondo

Masaaki Konishi

An airflow amount measuring body is formed such that two pipes are arranged in parallel and a bypass passage having an inverted U-shape is provided. The passage sectional areas A1, A2 and A3 of an upstream side passage, a turning section and a downstream passage of the bypass passage are set as A1&lt;A2 and A1&lt;A3, more preferably A2/A1.gtoreq.1.14 and A3/A1.gtoreq.1.20 to suppress contraction flow. A venturi tube section is provided at the lower end of the flow amount measuring body at the peripheral wall of the venturi tube section at the downstream side. A passage enlarging section is provided at the part of the peripheral walls of the venturi tube section at the downstream side where the bypass flow joins, and a guide section for guiding the bypass flow is provided at an outflow port of the bypass passage.

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Okazaki, Japan

Katsumi Nakashima