COMBUSTION CHAMBER STRUCTURE FOR ENGINE

Japanese Patent JP2022136398

A

To maintain tumble flow until the second half of a compression stroke and furthermore to suppress knocking in a combustion chamber with a pent roof type ceiling surface.SOLUTION: A combustion chamber 5 for an engine is partitioned by a crown surface 40 of a piston 4, an inner wall surface of a cylinder 20, and a pent roof type combustion chamber ceiling surface 5U. The crown surface 40 includes an exhaust side inclined surface 43 rising from the exhaust side to the center of the crown surface 40, an intake side inclined surface 44 rising from the intake side to the center of the crown surface 40, a flat surface 45 provided between the upper end of the exhaust side inclined surface 43 and the upper end of the intake side inclined surface 44, and a cavity 80 recessed in an area including the flat surface 45. The cavity 80 is arranged on the crown surface 40 in such a manner that an EX side edge 81 of the cavity 80 matches with an EX edge 451 being the upper end of an exhaust side inclined surface 43 or is located more on the intake side than the EX edge 451.SELECTED DRAWING: Figure 4

IMAMURA SATOSHI
FUKUMA MASANARI
YAMAGUCHI NAOHIRO
WADA YOSHITAKA
UEMURA TAKUMI
YAMAMOTO KEISUKE

JP2021035986A

September 21, 2022

March 08, 2021

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MAZDA MOTOR

F02B23/10; F02F3/26

Masataka Kotani
Etsushi Kotani
Haruhiro Hirata

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