Waste gate control for supercharged engines

Claim 1

A waste gate for an internal combustion engine having an exhaust gas driven supercharger interposed in its exhaust gas pipe supplying air under pressure greater than atmospheric to the engine intake manifold, comprising: a housing having a base portion provided with a passageway therethrough forming an inlet port and an outlet port, said housing having a hollow cylindrical portion and having a transversely apertured web securing said cylindrical portion to said base in spaced-apart relation coaxial with the inlet port; means connecting said base with the exhaust gas pipe upstream with respect to the location of said supercharger for exhaust gas communication with the passageway, said base having a bore coaxial with the inlet port; a valve having one end portion of its stem disposed between said base and said cylindrical portion and slidable intermediate its ends within the housing bore and having a head including a seat for opening and closing the passageway inlet port; spring means supported by said cylindrical portion for normally biasing said valve to an inlet port closed position; a substantially dish-shaped diaphragm support formed on said cylindrical portion; a diaphragm overlying and secured by its marginal edge portion to the marginal edge portion of said support for forming a chamber remote from said valve and said spring means; tubular means connecting the chamber with said intake manifold, said diaphragm being movable in one direction in response to an increased intake manifold pressure; and, lever means pivotally supported by said housing and operatively contacted by said spring means for normally biasing said diaphragm in an opposite direction in response to a decrease in intake manifold pressure.