US Patent 11773764 Purge device for passive or active prechambers

A purge system includes a prechamber in fluid communication with a main chamber of an engine cylinder, and a port divider having a dividing wall that creates a plurality of passages within an intake port of the main chamber. The purge system further includes an outer tube fixed between a first passage of the port divider and the prechamber, and an inner tube rotatable within the outer tube. The outer tube includes apertures along a wall of the outer tube that fluidly connect the outer tube with the first passage of the port divider and with the prechamber. The inner tube includes slots along a wall of the inner tube that to fluidly connect the first passage of the port divider and the prechamber when the slots align with the apertures.