Method for manufacturing engine poppet valve
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United States of America Patent
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-
Dec 27, 2022
Grant Date -
N/A
app pub date -
May 11, 2021
filing date -
Nov 12, 2018
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
At a diameter-decreasing operation during manufacture of a poppet valve, an intermediate stem portion at which a valve head portion and an intermediate stem portion are made integral by way of a neck portion may be inserted between/among diameter-decreasing tools. Application of compressive forces from compressing surfaces of the diameter-decreasing tools may cause a part of the intermediate stem portion to be decreased in diameter and may cause a main body portion of a first stem portion to be formed and may cause formation of a stepped portion which is continuous with the main body portion, and formation, by an absence of decrease in diameter, of a second stem portion which is broader in girth than the main body portion and which is continuous with the neck portion and which is also continuous with the main body portion by way of the stepped portion.
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