US 4,169,488 AGranted

Cooled engine valve

AssigneeCaterpillar Tractor Co.

InventorsAlexander Goloff, Richard A. Cemenska

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Abstract

An engine valve, reciprocally mounted in an engine, comprises a hollow stem having a head secured thereon and an annular face defined on the head adapted to engage an annular seat defined on an insert secured in the engine. A first tube is disposed in the stem to define a first passage therethrough and a fluted second tube is disposed between the stem and the first tube to define a plurality of second passages therethrough. A lower end of the first tube is open whereas a lower end of the second tube is closed by a cap whereby a coolant, such as oil, may be circulated through the first and second passages. A plurality of third passages are defined between the second tube and the stem to communicate with a chamber defined in the head of the valve, adapted to contain a vaporizable liquid coolant, such as water, therein. The insert has an annular passage defined therearound for circulating water about the seat and face for cooling purposes.

Claims16

Dependent claims

A valve comprising

an elongated hollow stem,
a head secured to an end of said stem and defining an annular face thereon,
circulation means disposed in said valve for circulating a first coolant therethrough, said circulation means comprising first tube means disposed in said stem to define first passage means therethrough and second tube means disposed radially between said first tube means and said stem in substantial coextensive relationship therewith to define second passage means between said first and second tube means communicating with said first passage means whereby said first coolant may be circulated through said first and second passage means, and
closed passage means disposed in heat exchange relationship relative to said circulation means for retaining a second coolant therein for transferring heat to said first coolant, said second tube means being fluted to comprise a plurality of circumferentially disposed flutes secured radially between said stem and said first tube means and wherein said closed passage means comprises a plurality of elongated and circumferentially disposed passages defined by said flutes radially between said second tube means and said stem and disposed in heat exchange relationship relative to said second passage means.

1 more element

Dependencies are inferred from the claim text.