Propeller Transmission Layout With Torsional Damping and Overload Clutch
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Solution Overview
Problem
Existing propeller transmission systems for aircraft powerplants face issues with vibration damping, noise, and harshness (NVH) performance, leading to reduced service life and increased weight and dimension due to external vibration damping systems, and lack effective torque overload protection.
Innovation Solution
A propeller transmission system integrating an overload clutch and torsional damper with a flexible disc, where the torsional damper is axially connected to the overload clutch, providing both vibration damping and torque overload protection, and featuring a disc hub core and flexible disc design to reduce radial dimension and weight, along with an isolation ring for impact protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a vibration damping system is arranged on or outside the case body, then vibration damping performance is improved, but the dimensional space and weight of the transmission system increase
Solution Approach 1:
The patent integrates the vibration damping system directly into the case body structure, merging the damping function with the housing. The case body is designed with damping elements embedded within it, eliminating the need for separate external damping components, thus improving vibration damping performance without increasing overall system weight.
Solution Approach 2:
The case body serves multiple functions: it provides structural housing for the transmission components and simultaneously acts as the vibration damping system. By making the case body multi-functional, the patent eliminates redundant components and reduces overall system weight while maintaining effective vibration damping.
2Object-affected harmful factors
If a vibration damping system is arranged on or outside the case body, then vibration damping performance is improved, but the dimensional space of the transmission system increases
Solution Approach 1:
The vibration damping system is merged with the case body structure, utilizing the housing space for damping functionality. This integration eliminates the need for additional external damping components, thereby improving vibration damping performance without increasing the dimensional space of the transmission system.
Solution Approach 2:
The damping elements are nested within the case body structure, with damping components positioned inside the housing cavity. This nesting approach allows the vibration damping system to be contained within the existing dimensional envelope of the transmission system, avoiding any increase in overall size.
3Reliability
If the clutch and rotating member are separated during overload, then protection from impact damage is achieved, but torque transmission capability is reduced
Solution Approach 1:
The clutch is designed with dynamic engagement characteristics, allowing it to slip under overload conditions to protect components, then re-engage to transmit full torque during normal operation. The friction plates and pressure plate create a dynamic system that adapts torque transmission based on load conditions, providing both protection and full power capability.
Solution Approach 2:
The clutch friction plates are designed with specific friction coefficients and contact pressures that allow controlled slippage during overload while maintaining high torque transmission during normal operation. By optimizing the friction parameters and spring pressure, the system achieves both protection during overload and full torque capability during normal conditions.
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 system achieves improved NVH performance, extended service life, reduced weight and dimension, and enhanced reliability by integrating overload protection and vibration damping, while allowing for higher torque transmission and impact protection.
Implementation Method 1
an output end of the overload clutch is in axial transmission connection with the torsional damper by a flexible disc
Implementation Method 2
the torsional damper is in transmission connection with the propeller shaft... enables the propeller transmission system to have vibration damping performance
Implementation Method 3
the clutch and the rotating member are temporarily separated from a rotating direction, that is, the clutch and a rotating shaft slip, so as to prevent rotating components from being damaged by impact
Data Source
AI summary
A propeller transmission system for an aircraft powerplant includes a propeller shaft. One end of the propeller shaft is a power input end, and the other end of the propeller shaft is configured to connect a propeller. The power input end of the propeller shaft is provided with a driven gear, and the driven gear is in transmission connection with an input end of an overload clutch. The propeller transmission system further includes a torsional damper, an output end of the overload clutch is in axial transmission connection with the torsional damper by a flexible disc, and the torsional damper is in transmission connection with the propeller shaft.