The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 20, 2017
Filed:
Mar. 20, 2013
Kabushiki Kaisha Toyota Chuo Kenkyusho, Nagakute-shi, Aichi-ken, JP;
Yoshihiro Nomura, Nagakute, JP;
Hidemasa Kosaka, Nisshin, JP;
Makoto Koike, Toyota, JP;
Yoshifumi Wakisaka, Nagoya, JP;
Yoshihiro Hotta, Nagoya, JP;
Kiyomi Nakakita, Toyota, JP;
KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHO, Nagakute-shi, JP;
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/s], and a thickness L [μm] of the thermal insulation thin layer, L≧16.7×λ and L≦207.4×(κ)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.