Hollow engine valve and production method thereof
AssigneeFuji Oozx Inc.
InventorsTakaaki KUMAGAI, Koji KUSHIMA
Life of this patent
Estimating the term…
Abstract
A hollow engine valve includes a shaft portion and an umbrella portion of which diameter is enlarged to form an umbrella shape to be provided on a base end of the shaft portion, a cooling material being enclosed in a hollow portion that is at least formed inside the shaft portion. The shaft portion comprises a first shaft portion in a tip end side, a second shaft portion that is provided in a base end side to have an outer diameter larger than that of the first shaft portion, and a stepped portion formed by a difference in the outer diameters between the first and second shaft portions. A wall thickness of the stepped portion is larger than that of the second shaft portion.
Claims4
A hollow engine valve comprising a shaft portion and an umbrella portion of which diameter is enlarged to form an umbrella shape to be provided on a base end of the shaft portion, a cooling material being enclosed in a hollow portion that is at least formed inside the shaft portion,
- wherein the shaft portion comprises a first shaft portion in a tip end side, a second shaft portion that is provided in a base end side to have an outer diameter larger than that of the first shaft portion, and a stepped portion formed by a difference in the outer diameters between the first and second shaft portions, and
- wherein a wall thickness of the stepped portion is larger than that of the second shaft portion.
A hollow engine valve comprising a shaft portion and an umbrella portion of which diameter is enlarged to form an umbrella shape to be provided on a base end of the shaft portion, a cooling material being enclosed in a hollow portion that is at least formed inside the shaft portion,
- wherein the shaft portion comprises a main shaft portion in a tip end side and a neck portion that is formed continuously from the umbrella portion to have an outer diameter larger than that of the main shaft portion,
- wherein a wall thickness of the neck portion is larger than that of the main shaft portion, and,
- wherein the hollow portion is formed to have a fixed inner diameter at least from the main shaft portion to the neck portion.
Dependencies are inferred from the claim text.