Gearcase exhaust vent for a marine propulsion system

Details Gearcase exhaust vent for a marine propulsion system Gearcase exhaust vent for a marine propulsion system

1988-08-04

1990-01-30

Basinger, Sherman D.

Marine propulsion

Means for accomodating or moving engine fluids

Means for handling exhaust gas

B63H 2132

Patent

active

048970611

ABSTRACT:
A marine propulsion system in which exhaust is routed through an internal exhaust passage which includes a convergent area forming a restricted flow path includes a pressure relief opening formed adjacent the area of restricted exhaust flow for relieving exhaust pressure. One or more closure plates are connected adjacent the one or more openings to selectively control the passage of exhaust therethrough. The plates are biased toward a closed position in which exhaust is prevented from passing through the openings. The bias on the plates is designed so as to yield to a predetermined level of exhaust pressure within the exhaust passage at the area of restricted exhaust flow, to thereby relieve exhaust pressure build-up and improve the performance of the marine propulsion system.

REFERENCES:
patent: 2570509 (1951-10-01), Bandli
patent: 3434447 (1969-03-01), Christensen et al.
patent: 3745964 (1973-07-01), Henrich

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