Nixon Peabody LLP
Direct-injection spark-ignition engine
A fuel spray and a tumble collide with each other from approximately opposite directions in a cavity formed in a piston head so that a combustible mixture stays around a spark plug for an extended period of time. An upper opening of the cavity is elongated to both the left and right sides of a cylinder axis. The distance between a ceiling of the combustion chamber and a bottom surface of the cavity is smaller on the right side of the cylinder axis than on the left side thereof and largest at least at a point where the cylinder axis crosses the bottom surface of the cavity, and a portion of the cavity to the left of the cylinder axis has a larger volumetric capacity than a portion of the cavity to the right of the cylinder axis, whereby a strong tumble is maintained up to a fuel injection point.
Mazda Motor Corporation
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Y02T F02B F02B F02B F02B F02F F02B
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Masatoshi Hiroyuki Noriyuki Hiroyuki Takehiko Fumihiko Masakazu Masashi
Seto Yoshida Ohta Yamashita Yasuoka Saito Matsumoto Marubara