Bbc Brown, Boveri & Company, Limited

Nicolaus Croes

Hansulrich Horler

Hubert Kirchhofer

A supercharger for an internal combustion engine has a rotor provided with cells, and two side housing portions. One side housing portion has a high pressure feed duct for the hot high-energy engine exhaust gas and a low pressure discharge duct for the expanded low-energy exhaust gas. The other side housing portion has a low pressure feed duct for the combustion air to be compressed and a high pressure discharge duct for the compressed combustion air. In at least one side portion there is formed a pocket open towards the rotor in a web between a high pressure duct and a low pressure duct. An opening is provided for feeding of fluid to the pocket without being influenced by the pressure-wave process in the cells. The cross-sectional area of the opening is dimensioned as a function of engine horsepower. The height of the opening is less than the height of the associated high pressure duct. One form of opening comprises an opening spaced from the rotor so that a web portion of the housing shields the opening from pressure waves generated by the rotor. Another form of opening comprises an opening arranged generally parallel to the gas flow and having its outlet in the pocket spaced sufficiently far from the rotor that there is no obstruction by pressure waves. Another form of opening means comprises an opening which is open toward the rotor, with the depth of the opening being sufficiently large that the outer portion of the opening is unobstructed by pressure waves.

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Baarn, Netherlands

Nicolaus Croes