Piston For Internal-Combustion Engine And Combination Of Piston And Piston Ring For Internal-Combustion Engine
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United States of America Patent
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Issued Date -
Nov 15, 2007
app pub date -
Nov 22, 2005
filing date -
Nov 22, 2004
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A piston for an internal-combustion engine includes a through-hole communicating with the inner space of the piston formed in an oil-ring groove into which an oil ring is fitted and a through-hole connected with a second-ring groove, the through-hole having an opening spreading from the lower portion of the bottom of the second-ring groove in a top-to-bottom direction of the piston to the lower surface of the second-ring groove and linearly extending to the inner space of the piston; and a combination of the piston and piston rings of the three-ring type for an internal-combustion engine, the end gaps of compression rings among the piston rings being set in a predetermined range.
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