Segmented Intake Port Design for Large Engine Combustion

The intake port is divided into multiple separate ports (first intake port, second intake port, third intake port, fourth intake port) instead of a single large port. Each port has its own outlet positioned at different locations and orientations around the cylinder, which segments the airflow paths and prevents the formation of a single large-scale swirl flow while still delivering sufficient total airflow to support high-pressure fuel injection

Each intake port outlet is designed with specific local characteristics including different positions (first, second, third, fourth outlets), different orientations (inclined portions at various angles), and different vertical positions relative to the cylinder. This local differentiation in port qualities allows each port to deliver air in a controlled manner that collectively reduces harmful swirl while maintaining overall combustion efficiency

For large-sized engines with cylinder diameters of 100 mm or more, the intake system is segmented into multiple ports rather than using a single large port. This segmentation controls the airflow patterns in each port to minimize swirl generation, enabling instantaneous combustion of fuel particles while maintaining the large displacement required for high productivity

Instead of allowing a single large intake port to create strong swirl flow (conventional approach), the invention inverts the approach by using multiple smaller ports with outlets oriented in different directions. This inverted strategy prevents swirl formation while still delivering the total airflow needed for large engine displacement, thereby improving combustion efficiency and productivity