Marine propulsion – Screw propeller – Propeller arrangement
Patent
1988-02-29
1989-01-03
Basinger, Sherman D.
Marine propulsion
Screw propeller
Propeller arrangement
74410, 74665K, 416129, B63H 510
Patent
active
047953829
ABSTRACT:
A marine drive unit (1) includes a lower gear case (8) forming a torpedo housing (9). A pair of coaxial propeller shafts (21, 25) are rotatably mounted in the housing and carry a pair of propellers (10, 11) thereon. The propeller shafts are driven by a pair of opposed driving gears (16, 24) suitably connected through a generally vertical main drive shaft (14) to a marine engine (4) and mounted on the horizontal drive axis (17). A pair of thrust bearings (44, 45) adapted to carry forward thrust loads are respectively disposed adjacent the facing portions of the opposed driving gears, with the pair being separated by a spacer (46) tightly confined therebetween. The spacer is locked against rotation but is freely floatable in an axial direction, and transfers the forward thrust load from one bearing to the other, so that the load is ultimately transferred from the outer propeller shaft (25) to the inner central shaft (21). The result is to reduce the rotational speed of each thrust bearing, in this instance by half.
REFERENCES:
patent: 2064195 (1936-12-01), Michelis
patent: 2406460 (1946-08-01), Guerke
patent: 2987031 (1961-06-01), Odden
patent: 4529387 (1985-07-01), Brandt
Basinger Sherman D.
Brunswick Corporation
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