摘要 |
A vertical vortex, namely, a reverse tumble flow TF is formed inside a cylinder (3A) of an internal combustion engine to form an intake air flow for smooth intake and exhaust in the internal combustion engine and also to promote atomization of fuel and mixing of air and fuel in a combustion chamber. To form this reverse tumble flow TF, a downstream portion (4) of an intake passage is formed extending toward a central axis (42) of the cylinder. To promote the formation of the swirl and further to form the combustion chamber as an efficient compact combustion chamber (7), a recessed portion (2A) is formed in a top wall of a piston (2). The top wall of the piston (2) is provided with a raised portion (2B) at a location adjacent to the recessed portion (2A), whereby, in the vicinity of top dead center of the piston (2), a squish (SF) is produced in a direction flowing toward a side of a spark plug (20) in the efficient combustion chamber (7). Under cooperation with the reverse tumble flow, the squish serves to have a rich air-fuel mixture centered around the spark plug (20) upon lean burn. <IMAGE> |
申请人 |
MITSUBISHI JIDOSHA KOGYO K.K., TOKIO/TOKYO, JP |
发明人 |
ANDO, HIROMITSU, OKAZAKI-SHI, AICHI-KEN 444, JP;TAKEMURA, JUN, TOYOTA-SHI, AICHI-KEN 471, JP;NAKANE, KAZUYOSHI, OKAZAKI-SHI, AICHI-KEN 444-31, JP;SAEKI, TETSUJI MITSUBISHI SHATAKU, NISHI 2-201, KYOTO-SHI, KYOTO-FU 616, JP |