Fluid reaction surfaces (i.e. – impellers) – With control means responsive to non-cyclic condition... – With electrical means comparing and reducing error related...
Patent
1993-09-23
1995-05-16
Look, Edward K.
Fluid reaction surfaces (i.e., impellers)
With control means responsive to non-cyclic condition...
With electrical means comparing and reducing error related...
416 48, 416157R, B63H 308
Patent
active
054155231
ABSTRACT:
A marine drive has a propeller rotatable about a drive axis and having a plurality of blades themselves pivotable about respective blade axes projecting generally radially from the drive axis and each movable between a low-pitch end position extending generally parallel to a plane perpendicular to the drive axis and a high-pitch end position extending at a large acute angle to the plane. An engine rotates the propeller about the drive axis at a variable drive speed in a forward rotation direction. The blade axes are so positioned relative to the respective blades that on forward rotation of the propeller the blades are urged into one of their end positions. A single-acting hydraulic actuator connected to the blades has a compartment pressurizable to displace the blades into the other of the end positions. A source of fluid under pressure has a high-pressure side connected to a controller that is also connected to the compartment and that compares actual engine speed with a desired engine speed and for pressurizing the compartment from the high-pressure side of the source when the actual engine speed varies to one side of the desired engine speed. A conduit connected between the low-pressure side of the source and the compartment continuously drains the compartment to the low-pressure side of the source.
REFERENCES:
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patent: 3589830 (1971-06-01), Mogren et al.
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patent: 4645420 (1987-02-01), Warner
patent: 5061212 (1991-10-01), Morgenthaler et al.
patent: 5209640 (1993-05-01), Moriya
Dubno Herbert
Larson James A.
Look Edward K.
Wilford Andrew
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