Outboard drive lower unit

Details Outboard drive lower unit Outboard drive lower unit

1996-09-04

1998-10-13

Sotelo, Jesus D.

Marine propulsion

Screw propeller

Propulsion unit casing

B63H 2032

Patent

active

058204253

ABSTRACT:
A lower unit for an outboard drive has an elongated length in order to present a streamline shape while providing sufficient width to house a transmission for a counter-rotational propeller system with a forwardly-oriented clutch element. One of the clutch elements of the transmission lies in front of the transmission gears to increase the flow area through an exhaust discharge path behind the transmission. In order to accommodate this transmission structure, the lower unit has an increased with at a point forward of the associated drive shaft. The lower unit also has an increased length as measured from the drive shaft forward in order to present a streamline shape within the water. The elongated length of the lower unit also improves the directional and rolling stability of the outboard drive.

REFERENCES:
patent: 4810218 (1989-03-01), Iwai
patent: 4832635 (1989-05-01), McCormick
patent: 4898553 (1990-02-01), Bankstahl
patent: 5575698 (1996-11-01), Ogino

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