Mechanically-Adjustable Pitch Propeller Hub
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Solution Overview
Problem
Existing fixed pitch propellers fail to provide optimal thrust under changing marine vessel conditions such as load and speed, requiring complex and costly control mechanisms for variable pitch propellers, and existing modifications do not effectively address performance issues.
Innovation Solution
A mechanically-adjustable pitch propeller with a cylindrical hub and radially extending blades, featuring an actuator that moves linearly along the hub axis and a motion transmission system converting linear motion into rotational motion for each blade, allowing for manual adjustment of pitch using a wrench, and compatible with existing propeller shafts through a sleeve mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed pitch propeller is used, then the structure is simple, but the propeller cannot provide optimal thrust under changing marine vessel conditions
Solution Approach 1:
The patent applies the dynamics principle by enabling the propeller blades to change their pitch angle dynamically. The blades are designed to be rotatable relative to the hub, allowing the pitch to be adjusted from a fixed state to a variable state. This transformation from static to dynamic configuration enables the propeller to adapt to changing marine vessel conditions while maintaining structural simplicity.
2Adaptability or versatility
If a variable pitch propeller is used to improve performance under changing conditions, then adaptability improves, but the control mechanism becomes complex and costly
Solution Approach 1:
The patent extracts the complex control mechanism from the propeller system by providing external adjustment means. Instead of incorporating automated pitch control mechanisms within the propeller, the invention allows pitch to be adjusted externally using simple wrenches or tools. This separation removes the disturbing complexity while retaining the beneficial variable pitch capability.
Solution Approach 2:
The patent applies self-service by designing the pitch adjustment mechanism to be manually operable without requiring complex automation. The adjustment means allows operators to directly modify the pitch angle using basic tools, eliminating the need for sophisticated control systems, motors, or sensors while still enabling adaptation to changing conditions.
3Force
If the pitch is increased to provide more thrust, then thrust capability improves, but the propeller becomes heavy in torque and requires more engine power
Solution Approach 1:
The patent resolves this contradiction by making the pitch dynamic rather than fixed. Operators can adjust the pitch angle based on actual operating conditions: using higher pitch angles when maximum thrust is needed and lower pitch angles when the vessel operates at higher speeds or lighter loads. This dynamic adjustment optimizes the balance between thrust generation and power consumption.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables optimal thrust adjustment under varying conditions in a simple and cost-effective manner, improving propeller performance and reducing fuel consumption without the need for complex control mechanisms.
Implementation Method 1
at least one motion transmission means communicating with the actuator and each blade for converting the linear motion of the actuator into the rotational motion of each blade
Data Source
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AI summary
The present invention relates to a mechanically-adjustable pitch marine vessel propeller (2) attached to a shaft (1) driven by an engine of a marine vessel, comprising a substantially cylindrical hollow hub (3) and a plurality of blades (10) extending radially outwardly from the hub (3) and being capable of rotating around an axis being in a radial direction relative to the hub (3). The propeller according to the present invention comprises an actuator (4) movable linearly along the axis of the hub (3) and at least one motion transmission means (10.2) communicating with the actuator (4) and each blade (10) for converting the linear motion of the actuator into the rotational motion of each blade in a radial direction relative to the axis of the hub.