Boat propeller device
AssigneeAB Volvo Penta
InventorsLennart H. Brandt, Staffan T. Mansson
Life of this patent
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Abstract
The invention relates to a boat propeller having rotatably journalled blades in its hub to enable shifting between forward and reverse without reversing the direction of rotation. The hub is rotatably journalled on the propeller shaft and contains a transmission between the shaft and the blades. The transmission can be coupled between positions for forward, reverse and neutral. The invention uses the torque of the motor and the reaction moment of the water against the blades to achieve a relative rotation between the shaft and the hub, whereby the transmission turns the blades to one of two stops, which define the positions for forward or reverse.
Claims6
Boat propeller device comprising a hub and blades rotatably journalled in the hub, characterized in that the blades are turnable between two end positions, one end position determining the setting of the blades for propulsion in a first direction with a certain direction of rotation of the hub, and the second end position determining the setting of the blades for propulsion in the opposite direction with the same direction of rotation, the hub being rotatably journalled on a propeller shaft and transmission means being disposed between the shaft and the blades said means being selectively engagable so that when there is a relative rotation between the hub and the shaft, the blades turn to one of said end positions.
Dependencies are inferred from the claim text.