US 2009/0020082 A1Published application

Hollow valve for internal combustion engine, and internal combustion engine having the hollow valve

OwnerTakao Suzuki, Kiyoyuki Kawai +3inventors

InventorsTakao Suzuki, Kiyoyuki Kawai, Masao Ishida, Kenichi Aoyagi, Toru Desaki

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Abstract

In a hollow valve for an internal combustion engine, including a stem portion, an umbrella portion provided at one end of the stem portion, a gastight cavity that communicates the interior of the stem portion with that of the umbrella portion, and a coolant contained in the cavity, the umbrella portion has a wall portion (a lower cap) having a combustion-chamber-side wall that forms a part of a wall of a combustion chamber of the engine, and a cavity-side wall that forms a part of a wall of the cavity, and at least one high-thermal-conductivity member is provided on the cavity-side wall, for conduction of heat between the wall portion and one of at least the coolant and the stem portion as a heat-conduction medium.

Claims11

Dependent claims

A hollow valve for an internal combustion engine, comprising:

a stem portion;
an umbrella portion provided at one end of the stem portion, said stem portion and said umbrella portion cooperating with each other to form a gastight cavity that communicates an interior of the stem portion with an interior of the umbrella portion;
and
a coolant contained in the cavity, wherein:
the umbrella portion has a wall portion having a combustion-chamber-side wall that forms a part of a wall of a combustion chamber of the internal combustion engine, and a cavity-side wall that forms a part of a wall of the cavity;
and
at least one high-thermal-conductivity member is provided on the cavity-side wall, for conduction of heat between the wall portion of the umbrella portion and at least one of the coolant and the stem portion as a heat-conduction medium.

4 more elements

Dependencies are inferred from the claim text.