Belt-Driven Rotor Systems for Lightweight Reconfiguration
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Solution Overview
Problem
Conventional vehicles with multiple rotor systems face challenges in achieving a lighter and easily reconfigurable design due to the use of heavy rotatable shafts connecting power plants to rotor systems, which are typically located away from the vehicle's center of gravity.
Innovation Solution
A rotor system design that centrally locates the transmission, drive shaft, and engine within the fuselage, utilizing a belt-driven propulsion system with complementary toothed gears and a flexible closed loop component to minimize slippage, allowing for synchronous movement of rotor blades without counter torque mechanisms, and includes locking mechanisms for easy reconfiguration between stowed and deployed positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heavy rotatable shafts are used to connect power plant to rotor systems, then reliable power transmission is achieved, but vehicle weight increases
Solution Approach 1:
The patent replaces heavy mechanical rotatable shafts with a belt-driven propulsion system. The power plant drives a transmission system that uses belts to transmit rotational power to multiple rotor systems. This substitution maintains reliable power transmission while significantly reducing the weight of connecting components, as belts are much lighter than traditional heavy-duty mechanical shafts designed for direct rigid coupling.
Solution Approach 2:
The patent introduces a transmission system with belts as an intermediary between the power plant and rotor systems. Rather than direct rigid shaft connections, the belt-driven transmission acts as a flexible mediator that transmits power while reducing weight. The transmission system includes pulleys and belts that provide reliable power delivery without the mass penalty of solid rotating shafts.
2Adaptability or versatility
If rotor systems are located away from center of gravity, then propulsion flexibility is improved, but vehicle stability deteriorates
Solution Approach 1:
The patent positions the power plant and transmission system at the vehicle's center of gravity, creating a stable central hub. Multiple rotor systems are then distributed around this central mass, each capable of independent rotation and control. This arrangement provides propulsion flexibility through differential rotor control while maintaining stability through the centralized mass distribution, allowing the vehicle to perform various maneuvers without compromising structural balance.
3Weight of moving object
If belt-driven propulsion system is used, then vehicle weight is reduced, but power transmission slippage increases
Solution Approach 1:
The patent employs toothed belts instead of smooth belts to prevent slippage. The teeth on the belts engage with corresponding teeth on the pulleys, creating a positive mechanical drive that eliminates relative motion between the belt and pulley surfaces. This parameter change in the belt design maintains the weight advantages of belt-driven systems while ensuring reliable, slip-free power transmission to all rotor systems.
4Adaptability or versatility
If rotor systems are made easily reconfigurable, then adaptability is improved, but structural complexity increases
Solution Approach 1:
The patent incorporates locking mechanisms that allow rotor systems to be selectively locked or unlocked relative to the central transmission hub. When locked, rotors maintain fixed positions for stable operation; when unlocked, they can be repositioned or stowed. This dynamic locking system provides easy reconfiguration capability without requiring complex mechanical structures, as the locking mechanisms are simple engagement features that can be activated or deactivated as needed.
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
The design results in a substantially lighter and more maneuverable aircraft by centralizing mass, reducing the need for heavy shafts, and enabling easy reconfiguration of rotor systems, enhancing stability and operational efficiency.
Implementation Method 1
a flexible closed loop component to minimize slippage
Data Source
AI summary
A vehicle includes a first rotor system having a rotor blade having an axis of rotation, a rotatable inboard drive component, and a rotatable outboard drive component. The first rotor system further includes a flexible closed loop component associated with each of the inboard drive component and the outboard drive component. Movement of the closed loop component can selectively cause at least one of rotation of the rotor blade about the axis of rotation and movement of the axis of rotation.