Marine stern drive oil cooling and circulating as well as pumpin

Details Marine stern drive oil cooling and circulating as well as pumpin Marine stern drive oil cooling and circulating as well as pumpin

1987-06-17

1988-08-16

Peters, Jr., Joseph F.

Marine propulsion

Screw propeller

Shafting

440 88, B63H 2110

Patent

active

047641355

ABSTRACT:
In a marine stern drive unit (1), oil is circulated upwardly from the propeller housing (9) and through the drive shaft sleeve (22) to the upper gear case (7). A return oil line (28) connects from the upper gear case and downwardly through the lower gear case (8) to the propeller housing. The return line is disposed within a cooling water chamber (33) communicating with the drive engine (4) to create an intercooling or heat exchanging effect whereby the incoming water from a lake or the like cools the recirculating stern drive unit lubricant. A combination of threaded drive shaft (13, 36) and internally grooved sleeve (37, 38) is utilized to pump the oil through the system.

REFERENCES:
patent: 3181495 (1965-05-01), Kiekhaefer
patent: 3520272 (1970-07-01), Ellzey
patent: 3645360 (1972-02-01), Holtermann
patent: 4650430 (1987-03-01), Schiek
Mercury Service Manual, 1984, No. 90-97658--3 (4 pages).

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