Valve arrangement for an exhaust passage in a marine propulsion

Details Valve arrangement for an exhaust passage in a marine propulsion Valve arrangement for an exhaust passage in a marine propulsion

1992-10-19

1994-04-05

Mitchell, David M.

Marine propulsion

Means for accomodating or moving engine fluids

Means for handling exhaust gas

B63H 2132

Patent

active

052999610

ABSTRACT:
A marine propulsion unit includes a cavitation cavity defining a supplemental exhaust gas passage terminating at an exhaust outlet port which is adapted to be opened and closed by a normally closed flapper valve member. The exhaust outlet port includes lateral sidewalls and the flapper valve member includes a fixed portion secured to one of the lateral sidewalls and a cantilevered portion that extends across the exhaust outlet port. The cantilevered portion is adapted to flex relative to the fixed portion so as to open and close the exhaust outlet port in response to dynamic forces acting on the valve member during operation of the watercraft. A stopper plate is provided to limit the deflection of the cantilevered portion of valve member. The cantilevered portion of the valve member is further provided with a fin which projects into the water during operation of the watercraft so that the dynamic pressure of the water acts against the fin the supplement the dynamic pressure exerted on the valve member by the exhaust gas pressure from within the supplemental exhaust passage and to cause the valve to open. When the watercraft is stopped, running at low speeds, decelerating or immediately after planning, the valve will assume a position in which it closes the supplemental exhaust outlet port to reduce exhaust noise.

REFERENCES:
patent: 3943876 (1976-03-01), Kiekhaefer
patent: 4023353 (1977-05-01), Hall
patent: 4545771 (1985-10-01), Iio
patent: 4601666 (1986-07-01), Wood
patent: 4897061 (1990-01-01), Koepsel et al.
1989 Catalogue of VOVO PENTA, Volvo Penta of America, Rockleigh, N.J. 07646-0927.

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