Exhaust gas driven supercharger for supercharging internal combustion engines

Claim 1

An exhaust gas driven supercharger for an internal combustion engine having cylinders which produce cyclical exhaust gas pulses comprising; a housing defining a supercharging chamber, a movable partition separating said chamber into two chambers, an exhaust gas chamber having an exhaust inlet and an exhaust outlet, and a supercharging air chamber having an air inlet and air outlet, a first exhaust duct for conducting exhaust gas from said cylinder to said exhaust gas chamber through said exhaust inlet, such that said exhaust gas acts upon said partition to urge said partition to move in said housing, a second exhaust duct for conducting exhaust gas from said exhaust gas chamber through said exhaust outlet, a first air duct for conducting air into said supercharging air chamber through said air inlet, a second air duct for conducting air to said cylinder from said supercharging air chamber through said air outlet such that movement of said partition causes air to be pumped through said second air duct into said cylinders, and means incorporated into either of said first or second exhaust ducts for modifying the duration of pulses of exhaust gas within said exhaust gas chamber.