US 4,178,873 AGranted

Exhaust coupling assembly for a marine stern drive

AssigneeBrunswick Corporation

InventorHerbert A. Bankstahl

Life of this patent

Estimating the term…

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Abstract

A marine stern drive includes an inboard engine having an exhaust passageway connected to an outboard drive unit having an exhaust passageway. A transom bracket assembly positioned between the engine and the drive unit permits vertical pivoting of the drive unit for steering and horizontal pivoting of the drive unit for steering and horizontal pivoting of the drive unit for trimming. The improvement includes a first exhaust pipe connected to the inboard engine and a second exhaust pipe connecting to the drive unit. The first exhaust pipe extends outward through the transom of the boat and has an open end position centered on and adjacent the vertical pivot axis and below the vertical pivot axis. The second exhaust pipe extends towards and ends in alignment with the end position of the first exhaust pipe to form an interface which includes an opening between the pipe ends.

Claims10

Dependent claims

A stern drive for propulsion of a boat including

(A) an inboard engine having an exhaust passageway means,
(B) an outboard driven unit coupled to the engine having an exhaust passageway means,
(C) a transom mounting assembly including pivot mounting means positioned between the inboard engine and the drive unit, the pivot mounting means including a vertical pivot axis for steering of the drive unit and a horizontal pivot axis for trimming of the drive unit, the improvement which comprises
(a) a first exhaust pipe connected to said inboard engine exhaust passageway means and extending outward through the transom of a boat and having an open end position centered on, adjacent said vertical pivot axis, and below said horizontal pivot axis
(b) a second exhaust pipe connected to said exhaust passageway means of said drive unit, said second exhaust pipe pivoting with the trim movement of the drive unit and extending towards and ending in alignment with said end position of said first exhaust pipe to form an interface therebetween which includes an opening therebetween providing a substantially equal exhaust leakage over the entire pivotal steering movement of the drive unit for any given trim position of the drive unit.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 05/875,447Filed 6 Feb 1978
Granted: 18 Dec 1979
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

F01N 13/085
Other arrangements or adaptations of exhaust conduits: having means preventing foreign matter from entering exhaust conduit
B63H 20/26
Arrangements, apparatus and methods for handling exhaust gas in outboard drives, e.g. exhaust gas outlets: exhaust gas outlets passing through the…
F01N 13/12
Exhaust or silencing apparatus characterised by constructional features: specially adapted for submerged exhausting
B63H 20/10
Means enabling movement of the position of the propulsion element, e.g. for trim, tilt or steering; Control of trim or tilt: means enabling trim…