Mazda Motor Corporation

Shintaro Okada

Daisuke Shimo

Sangkyu Kim

Takashi Sumimoto

Shuji Takuma

Kazunori Hirabayashi

Tomonori Harada

Shinichiro Tagami

Tomoyuki Kanda

An engine combustion chamber structure includes a combustion chamber of an engine and a fuel injection valve. The fuel injection valve injects fuel toward a cavity in a crown face of a piston. The cavity includes a first cavity provided in a radially central region of the crown face with a first bottom having a first depth, a second cavity provided in an outer side of the first cavity with a second bottom having a second depth being smaller than the first depth, a connecting portion, and a standing wall region disposed further in a radially outer side than the second bottom of the second cavity. The second bottom is provided lower than an upper end, of the connecting portion. A lower section of the standing wall region is provided further in a radially inner side than an upper edge of the standing wall region.

Combustion chamber structure of engine

A cavity includes a lower-side cavity, an upper-side cavity, a first lip and a second lip. The upper-side cavity has a guide curved surface which extends along a circumference of a first imaginary circle in a section along a cylinder-axis direction, and the first lip has a curved surface which extends along a circumference of a second imaginary circle in a section along the cylinder-axis direction. An angle X which a cylinder axis makes with a common tangential line of the first imaginary circle and the second imaginary circle is set as 75&#xb0;&#x3c;X&#x3c;80&#xb0;. The guide curved surface is configured such that an angle Y of this guide curved surface which occupies at the circumference of the first imaginary circle is set as 80&#xb0;&#x3c;Y&#x3c;(180&#xb0;&#x2212;X).

Compression ignition engine

Growing community of inventors

Higashihiroshima, Japan

Shintaro Okada