Lubricating device for four stroke outboard motor

Details Lubricating device for four stroke outboard motor Lubricating device for four stroke outboard motor

1990-04-20

1991-12-17

Yeung, James C.

Lubrication

Systems

Dry sump

184 62, 123196R, F01M 1106

Patent

active

050728091

ABSTRACT:
A number of embodiments of outboard motors including dry sump lubricated four cycle internal combustion engines. The dry sump lubrication system includes a scavenge pump for drawing lubricant drained from the engine lubricating system through an inlet port and returns it to a dry sump reservoir through an outlet port and a pressure pump that draws lubricant from the dry sump lubricant reservoir through an inlet port and delivers it the engine lubricating system through an outlet port. At least one of the ports of each of the pumps is positioned above the normal lubricant level in the lubricant reservoir when it is filled with the normal volume of lubricant so as to insure that lubricant will not drain back into the engine when the pump system is not operating. Various arrangements for achieving this result and for cooling the lubricant are described.

REFERENCES:
patent: 2991845 (1961-07-01), Scheffler, Jr.
patent: 4709671 (1987-12-01), Sumigawa

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