Helicopter Rotor Blade Control Rod With Switchable Adjustment Stops
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Solution Overview
Problem
Existing control rod arrangements for adjusting helicopter rotor blades are complex, prone to errors, and heavily loaded by external forces, requiring manual and time-consuming pre-adjustment processes, which complicates in-flight tuning and increases the risk of vibrations due to imbalance.
Innovation Solution
A control rod design featuring a contact area element and a stop element that allows for adjustable longitudinal movement, where the stop element can be transferred between positions to limit the adjustment range, enabling both coarse and fine adjustments using an electric motor, reducing manual operation and part count, and distributing forces more efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a locking nut and locking ring mechanism is used for mechanical pre-adjustment of the control rod, then the control rod can be adjusted in length, but the mechanism becomes extremely complex and prone to errors
Solution Approach 1:
The patent removes the complex locking nut and locking ring mechanism from the control rod assembly. Instead, it uses a simplified design where the control rod can be directly adjusted in length by moving its telescopic sections relative to each other, eliminating unnecessary components and simplifying the adjustment process
Solution Approach 2:
Rather than using a complex locking mechanism to secure the adjusted position, the invention inverts the approach by using a simple release mechanism that allows the control rod to be easily adjusted and then locked in position through the natural engagement of its telescopic sections, reversing the traditional logic of lock-before-adjust to adjust-before-lock
2Manufacturing precision
If stops are used to limit the adjustment range of the control rod, then the adjustment area can be predetermined, but the stops are heavily loaded by external forces and spindle drive forces
Solution Approach 1:
The patent introduces a force-distributing mechanism that acts as an intermediary between the external forces and the stop elements. This mechanism spreads the loads across multiple contact points and structural elements, preventing the stops from bearing the full brunt of external forces and spindle drive forces
Solution Approach 2:
The invention employs dynamic force distribution where the control rod's telescopic sections can flex and adjust their load-bearing characteristics based on the applied forces. This dynamic response allows the system to accommodate external forces without overloading the stop elements, as the structure adapts to distribute loads optimally
3Measurement precision
If manual pre-adjustment is performed on the ground with the rotor stationary, then the control rod can be set to a predetermined position, but the process is time-consuming and complex
Solution Approach 1:
The patent replaces the manual mechanical adjustment process with an automated system that uses sensors to detect the control rod's position and an actuator to automatically adjust it to the desired length. This substitution eliminates the need for manual intervention, reducing both the time and complexity of the pre-adjustment process while maintaining or improving precision
Data Source
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AI summary
The invention relates to a control rod (1) for adjusting a rotor blade of a helicopter. Said control rod (1) can be longitudinally adjusted and comprises: at least one contact region element (15), and at least one stop element (8, 9) that is designed to limit, in cooperation with the at least one contact region element (15), the longitudinal adjustability of the control rod (1) to an adjustment range which can be predetermined. The stop element (8, 9) can be transferred from a first position (P1) to a second position (P2), the at least one stop element (8, 9) limiting the adjustability of the control rod in the first position (P1) and allowing the control rod (1) to be adjusted beyond the predeterminable adjustment range in the second position (P2).