Spark ignition type internal combustion engine

Patent metadata

Field	Value
Publication number	US-9683480-B2
Application number	US-201313847808-A
Country	US
Kind code	B2
Filing date	Mar 20, 2013
Priority date	Mar 30, 2012
Publication date	Jun 20, 2017
Grant date	Jun 20, 2017

Abstract

In a spark ignition engine, a thermal insulation thin layer is formed over a wall surface, facing an inside of a combustion chamber, of a base material forming the combustion chamber, and for a thermal conductivity λ [W/(m·K)], a thermal diffusivity κ [mm 2 /s], and a thickness L [μm] of the thermal insulation thin layer, L≧16.7×λ and L≦207.4×(κ) 0.5 are satisfied. With such a configuration, a heat loss Q_total escaping from gas in a cylinder to the wall of the combustion chamber over all strokes can be reduced, and the thermal efficiency can be improved without inducing degradation of knocking due to an increase in an amount of heating Q_intake of the gas in the cylinder during an intake stroke.

First claim

What is claimed is:

1. A spark ignition engine in which a thermal insulation layer is formed over a wall surface, facing an inside of a combustion chamber, of at least a part of base materials forming the combustion chamber, and mixture gas in the combustion chamber is ignited to burn the mixture gas, wherein:
for a thermal conductivity λ [W/(m·K)], a thermal diffusivity κ [mm 2 /s], and a thickness L [μm] of the thermal insulation layer, relationships:
(i) 16.7×λ≦L≦207.4×(κ) 0.…

Assignees

• Toyota Chuo Kenkyusho Kk

Inventors

• Nomura Yoshihiro
• Kosaka Hidemasa
• Koike Makoto
• Wakisaka Yoshifumi
• Hotta Yoshihiro
• Nakakita Kiyomi

Classifications

• F05C2251/048

  Mechanical Engineering · mapped topic

• F02F1/00

  Mechanical Engineering · mapped topic

• F02B23/00 Primary

  Mechanical Engineering · mapped topic

• F02B77/11

  Mechanical Engineering · mapped topic

• F05C2203/0869

  Mechanical Engineering · mapped topic