Electric Propulsion Assembly Layout for Propeller Pitch Access
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Solution Overview
Problem
The existing arrangement of electric propulsion assemblies in aircraft results in the propeller pitch adjustment system being difficult to access, particularly during maintenance, due to the positioning of electric motors surrounding it.
Innovation Solution
Repositioning at least one electric motor to the front zone of the propulsion assembly, with the propeller pitch adjustment system located in the rear zone, and incorporating a connection structure and guide system to ensure the motor does not interfere with the propeller, enhancing accessibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If electric motors are arranged all around the propeller pitch adjustment system in the rear zone, then the propulsion assembly achieves a compact unit architecture, but the propeller pitch adjustment system becomes difficult to access during maintenance
Solution Approach 1:
The propulsion assembly is divided into two distinct zones: a front zone containing the propeller and at least one electric motor, and a rear zone containing only the propeller pitch adjustment system. This spatial segmentation allows the pitch adjustment system to be accessed independently without interference from electric motors, resolving the accessibility issue while maintaining overall system compactness through shared transmission components.
2Ease of operation
If electric motors are positioned in the front zone with connection structures, then accessibility to the propeller pitch adjustment system is improved, but the risk of motor interference with the propeller increases
Solution Approach 1:
A connection structure comprising a tube acts as an intermediary element between the transmission system and the propeller. This tube transmits rotational force from the transmission system to the propeller while physically separating the electric motor in the front zone from the propeller, thereby eliminating direct interference while maintaining functional coupling.
3Object-affected harmful factors
If a connection structure comprising a tube is introduced between the transmission system and propeller, then motor-propeller interference is prevented, but the device complexity increases
Solution Approach 1:
The connection structure comprising a tube serves multiple functions simultaneously: it transmits rotational force from the transmission system to the propeller, provides physical separation to prevent motor interference with the propeller, and maintains structural integrity of the propulsion assembly. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in overall device complexity.
Data Source
AI summary
An aircraft propulsion system comprising a propeller, a plurality of electric motors, a transmission system configured to couple the electric motors to the propeller, and a propeller pitch adjustment system positioned at the rear of the transmission system. At least one of the electric motors is positioned in front of the transmission system. A connection structure is interposed between the propeller and the transmission system, the connection structure and the output shaft of the transmission system connected to the propeller being configured so that no electric motor positioned in front of the transmission system interferes with the propeller. Also an aircraft with such a system.