Cylinder head variable swirl siamese type intake port structure

Details Cylinder head variable swirl siamese type intake port structure Cylinder head variable swirl siamese type intake port structure

1986-08-11

1987-06-09

Cross, E. Rollins

Internal-combustion engines

Means to whirl fluid before, upon, or after entry into...

Having multiple oxidant inlet means

F02B 1500

Patent

active

046712330

ABSTRACT:
A variable swirl siamese type intake port structure for an internal combustion engine cylinder head includes a first generally straight intake passage which leads to a first intake port and a second generally helical intake passage which leads to a second intake port which is formed with a helical end vortex portion. A control valve is fitted in the first generally straight intake passage at an upstream portion thereof so as to control its flow resistance. A means is provided to the generally straight intake passage on the side thereof towards the generally helical intake passage, for, when the control valve is in its position to maximize the flow resistance of the generally straight intake passage, diverting a relatively minor proportion of air-fuel mixture sucked into the intake port structure from a point upstream of the control valve to a point near the downstream end of the first generally straight intake passage, thus bypassing the control valve. Further, there is provided a means for biasing flow of air-fuel mixture sucked into the intake port structure towards the diverting means. This diverting means may include an auxiliary passage formed from upstream of the control valve to a portion of the generally straight intake passage near the downstream end thereof, or alternatively a notch portion formed in said control valve, preferably in the edge thereof which is on the side thereof towards said generally helical intake passage.

REFERENCES:
patent: 4548175 (1985-10-01), Kawai et al.

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