Honda Motor Co., Ltd.

Masayuki Taguchi

Hiroyuki Kojima

Kosuke Horisaki

Yoshitaka Hara

A head cover structure () for an internal combustion engine () comprises a head cover () connected to a cylinder head (), and an auxiliary cover () connected to the head cover and defining a gas-liquid separation passage () jointly with the head cover, the gas-liquid separation passage being communicated with a crankcase chamber () of the internal combustion engine, and configured to separate lubricating oil from a crankcase gas drawn from the crankcase chamber, wherein the auxiliary cover is integrally formed with an intake pipe () internally defining a part of an intake passage () of the internal combustion engine, and the auxiliary cover internally defines a crankcase gas introduction passage () communicating the gas-liquid separation passage with an interior of the intake pipe.

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Saitama, Japan

Masayuki Taguchi