Engine and supercharger with liquid cooled housings

The present invention reduces the overheating of sealed oil gear cases and excessive charge air temperatures at high engine speeds in automotive supercharger use by providing liquid cooling of one or more of the housings of a supercharger. Cooling the front cover of the supercharger will reduce the gear case temperatures under boost. Cooling the bearing housing will also reduce gear case temperatures in the adjacent gear case. Cooling the rotor housing, in combination with cooling of the rotors by a separate system, will maintain more uniform clearances under continuous boost, as with racing and autobahn applications. Cooling may be by traditional liquid coolant or with oil, and with separate or combined systems. The invention discloses liquid coolant systems for controlling sealed gear case lubricant temperatures as well as supercharger charge air temperatures if desired. Combined coolant handling and flow systems and their advantages are also disclosed. An exemplary engine-supercharger combination is described and illustrated.