Intake system for multiple-valve engine

Details Intake system for multiple-valve engine Intake system for multiple-valve engine

1990-08-10

1991-10-29

Cross, E. Rollins

Internal-combustion engines

Combustion chamber means combined with air-fuel mixture...

Air or combustible mixture entering the combustion chamber...

123308, F02B 1500

Patent

active

050606166

ABSTRACT:
An intake system having first, second and third intake ports connected to first, second and third air intake passages, respectively and up stream ends of three air intake passages are connected to a common air intake passage. The first air intake passage is set to supply air through the first intake port along an inner peripheral surface of the combustion chamber. The second and third air intake passages are set so that axial center lines thereof may intersect an axial center line of the first air intake passage and an intersecting point of the axial center lines of the third and first air intake passages are up stream of the intersection of the axial center lines of the second and first air intake passages. Thus, swirl of intake air in the combustion chamber from the third intake port is stronger than that generated by the intake air from the second intake port. Then, swirl around an ignition plug arranged almost in the center of the combustion chamber is strengthened. In addition, turbulent flow of intake air is generated by using the difference of velocities between the outside swirl and the swirl around the spark plug, resulting in improved combustability. In addition, cooling loss of the cylinder is prevented by relatively reducing the swirl around the outer periphery of the combustion chamber.

REFERENCES:
patent: 4622940 (1986-11-01), Yoshikawa
patent: 4942857 (1990-07-01), Yoshikawa
patent: 4971008 (1990-11-01), Morishita

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