Swirl generating arrangement for an internal combustion engine

摘要

A rectangular vane is pivotally disposed in a rectangular cross-sectioned portion of an induction passage and operatively connected to a device such as the throttle valve of the engine. The vane accelerates the incoming charge and shapes it into a rectangular cross-sectioned jet stream having a flow component maximized in a plane normal to the cylinder axis. The induction passage in which the vane is disposed is oriented with respect to the cylinder so that the incoming jet stream enters the combustion chamber tangentially with respect to the wall of said cylinder to thereafter swirl about the combustion chamber. The strong horizontal (with respect to the cylinder axis) flow component ensures that the swirl will persist till the end of the compression stroke of the engine hence increasing the flame propagation speed which extends the lean burn limit and EGR tolerance of the engine.