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US 11,661,161 B2Granted
Nautical propeller
AssigneeMassimiliano Bianchi
InventorMassimiliano Bianchi
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AssigneeMassimiliano Bianchi
InventorMassimiliano Bianchi
Estimating the term…
A propeller (1) and a respective use method are described, comprising a cylindrical casing (3), a hub (2) couplable to an engine and rotatably mounted at least partially in the cylindrical casing of the propeller, and at least one blade (4) rotatably pivoted to the cylindrical casing. The hub (2) is rotatable with respect to the cylindrical casing of the propeller, or vice versa, to adjust the fluid dynamic pitch of the at least one blade (4). The propeller further comprises at least one elastic element (8) interposed between the hub (2) and the cylindrical casing (3) and it is characterized in that the elastic element (8) is preloaded to prevent its deformation until the resistant torque opposing the propeller rotation is lower than the torque generated by the preload of the elastic element (8), wherein said at least one blade is arranged on at least one first fixed fluid dynamic pitch before the deformation of the elastic element (8) begins. It is further described a flat spring (100) for propellers, which has a longitudinal development line (MS) and comprises a plurality of notches (103) transversally arranged with respect to the longitudinal development line. At least two distances (MD) between successive notches (103) are different from one another and/or at least two notches (103) are different from one another.
A propeller (1) comprising a cylindrical casing (3), a hub (2) couplable to an engine and rotatably mounted at least partially in said cylindrical casing of the propeller, and at least one blade (4) rotatably pivoted to said cylindrical casing of the propeller, said hub (2) being rotatable with respect to said cylindrical casing of the propeller, or vice versa, to adjust the fluid dynamic pitch of said at least one blade (4), the propeller further comprising at least one elastic element (8) interposed between said hub (2) and said cylindrical casing (3) in a space (S) having an annular shape for adjusting the fluid dynamic pitch of said at least one blade, characterized in that said at least one elastic element (8) is preloaded to prevent its deformation until a resistant torque opposing the propeller rotation is lower than a torque generated by the preload of said at least one elastic element (8), said at least one blade being arranged on at least one first fluid dynamic pitch before the deformation of said at least one elastic element (8) begins, characterized by comprising means (30) for modifying the preload of said at least one elastic element (8), wherein said means (30) for modifying the preload of said elastic element (8) comprise at least one element, at least partially threaded, for the installation in at least one seat (31) comprising at least one threaded portion (31a) and wherein said means (30) for modifying the preload of said elastic element (8) modify the space (S), having an annular shape, available for the extension of said elastic element (8).
A propeller (1) comprising a cylindrical casing (3), a hub (2) couplable to an engine and rotatably mounted at least partially in said cylindrical casing of the propeller, and at least one blade (4) rotatably pivoted to said cylindrical casing of the propeller, said hub (2) being rotatable with respect to said cylindrical casing of the propeller, or vice versa, to adjust the fluid dynamic pitch of said at least one blade (4), characterized by comprising at least one elastic element (8′) interposed between said cylindrical casing (3) and said hub (2) in a space (S) having annular shape and designed to generate a torque for the rotation of said hub (2) with respect to said cylindrical casing (3) of the propeller, or vice versa, in at least one predetermined relative position, when said engine imposes a null engine torque to said hub (2), said propeller further comprising means (30) for modifying the preload of said at least one elastic element (8′), wherein said means (30) for modifying the preload of said elastic element (8′) comprise at least one element, at least partially threaded, for the installation in at least one seat (31) comprising at least one threaded portion (31a), and wherein said means (30) for modifying the preload of said elastic element (8) modify the space (S), having an annular shape, available for the extension of said elastic element (8).
A propeller (1) comprising a cylindrical casing (3), a hub (2) couplable to an engine and rotatably mounted at least partially in said cylindrical casing of the propeller, and at least one blade (4) rotatably pivoted to said cylindrical casing of the propeller, said hub (2) being rotatable with respect to said cylindrical casing of the propeller, or vice versa, to adjust the fluid dynamic pitch of said at least one blade (4), further comprising at least a second elastic element (8′ 8″) directly or indirectly interposed between cylindrical casing (3) and hub (2) and sized to eliminate shocks and dynamic stresses between cylindrical casing (3) and hub (2), wherein said elastic element (8″), sized to eliminate shocks and dynamic stresses between cylindrical casing (3) and hub (2), is arranged inside the hub (2) by interposing an intermediate element (2′) between the hub (2) and a drive shaft, wherein said at least one elastic element (8′) is a flat spring (100), said spring having a longitudinal development line (MS) and comprising a plurality of notches (103) transversally arranged with respect to said longitudinal development line, characterized in that the distance between a first and second successive notch is different than the distance between a second and third successive notch and/or at least two notches (103) have at least width different from one another.
Dependencies are inferred from the claim text.