Honda Motor Co., Ltd.

Honda Giken Kogyo Kabushiki Kaisha

Teruo Kobayashi

Masaki Kanehiro

Shinji Yamada

Sadao Kojima

Masakatsu Honda

Naohiro Isogai

Yasutoshi Ito

Yuki Ito

Kan Nakaune

Nobuo Suzuki

Takeru Hamakawa

Shuichi Kitahara

Kinya Fujii

Yuusuke Wada

Kaoru Ishii

An internal-combustion engine includes a cylinder, a piston, a spark plug, and a fuel injection device. The piston includes a top surface, a guiding protrusion, and a cavity. The cavity is provided at a position closer to the fuel injection device than the guiding protrusion when viewed from above the top surface of the piston. The guiding protrusion includes a guiding surface to guide the fuel mist toward the spark plug when the fuel mist is injected from the fuel injection device at a first predetermined timing in a compression stroke. The cavity includes a guiding wall portion to guide the fuel mist toward the spark plug when the fuel mist is injected from the fuel injection device at a timing in the compression stroke between the first predetermined timing and a second predetermined timing.

Internal-combustion engine

A pulser plate mounting structure is provided in which a key groove () is formed in a mounting face () of a rotating wall portion () formed from a crank arm () and a counterweight (), a key portion () for engaging with the key groove () is formed on a pulser plate (P) that is superimposed on the mounting face (), and this pulser plate (P) is secured to the rotating wall portion () by means of a securing member (), wherein the key portion () is formed from an arched band-shaped portion () projecting in an arched shape from the pulser plate (P) on one end face side thereof and engaging with the key groove (), and a pair of connecting portions () for providing integral connection between the pulser plate (P) and opposite ends of the arched band-shaped portion (). This provides a high precision of positioning of the pulser plate relative to the crankshaft and a good productivity for the pulser plate.

Pulser plate mounting structure

A collecting exhaust port provided in a cylinder head is comprised of exhaust port sections extending from exhaust valve bores in cylinders , and an exhaust collecting section in which the exhaust port sections are collected. The cylinder head includes a protrusion projecting in an arch shape outside a side wall of a cylinder block . The exhaust collecting section of the collecting exhaust port directly faces an inner surface of a side wall of the protrusion . Water jackets J and J for cooling the protrusion are provided in upper and lower surfaces of the protrusion having the collecting exhaust port defined therein. The water jackets J and J are not provided between the side wall of the protrusion and the exhaust collecting section . Thus, the compact cylinder head having the collecting exhaust port integrally provided therein can be formed, while avoiding the complication of the structure of a core.

Cylinder head structure in multi-cylinder engine

A collecting exhaust port provided in a, cylinder head is comprised of exhaust port sections extending from exhaust valve bores in cylinders and an exhaust collecting section in which the exhaust port sections are collected. The cylinder head includes a protrusion projecting in an arch shape outside a side wall of a cylinder block The exhaust collecting section of the collecting exhaust port directly faces an inner surface of a side wall of the protrusion Water jackets J and J for cooling the protrusion are provided in upper and lower surfaces of the protrusion having the collecting exhaust port defined therein. The water jackets J and J are not provided between the side wall of the protrusion and the exhaust collecting section Thus, the compact cylinder head having the collecting exhaust port integrally provided therein can be formed, while avoiding the complication of the structure of a core.

Growing community of inventors

Wako, Japan

Teruo Kobayashi