Propellant Force Generator Axial Size Reduction
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Solution Overview
Problem
Existing propellant force generators are large in the axial direction due to the alignment of a threaded portion with an electric motor, making it challenging to vary the pitch angle of rotational blades efficiently while maintaining a compact size.
Innovation Solution
A propellant force generator design that includes a first motor for generating propellant force, a second motor for changing pitch angles, and converting units that allow for the conversion of rotational motion into linear motion and vice versa, with parts of these units located within the first motor to reduce overall size, utilizing a ball screw mechanism to reduce drive torque and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a threaded portion is aligned linearly with an electric motor to vary pitch angle, then the pitch angle can be adjusted, but the size of the propellant force generator in the axial direction becomes large
Solution Approach 1:
The converting unit is placed inside the hollow rotational shaft of the motor, nesting one component within another. This allows the pitch angle adjustment mechanism to be accommodated within the existing motor structure without increasing the axial length, resolving the contradiction between functionality and compactness
Solution Approach 2:
Instead of arranging components linearly along the axial direction, the invention utilizes the radial space by placing the converting unit within the hollow shaft. This dimensional reorganization allows pitch adjustment functionality without extending the axial footprint
2Device complexity
If hydraulic pressure is used to adjust pitch angle, then the mechanism can be simplified, but the system becomes larger and more complex in terms of fluid systems
Solution Approach 1:
The invention replaces hydraulic pressure systems with an electric motor-driven mechanism. This substitution eliminates the need for hydraulic fluid, pumps, and associated components, reducing both the axial size and the type of complexity from fluid systems to compact mechanical-electrical integration
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 enables the reduction of the propellant force generator's size in the axial direction while allowing for variable pitch angles of rotational blades, improving stability and response speed, and eliminating the need for hydraulic pressure, thus reducing noise and complexity.
Implementation Method 1
utilizing a ball screw mechanism to reduce drive torque and power consumption
Data Source
AI summary
A propellant force generator is provided having the size in the axial direction of a rotational shaft of a motor reduced while making the pitch angles of rotational blades driven by the motor variable. The propellant force generator includes a propellant-force generating motor adapted to generate a propellant force for rotational blades, a pitch varying motor adapted to generate a rotational motion for changing pitch angles of the rotational blades, a rotation-linear motion converting unit adapted to convert the rotational motion generated by the pitch varying motor into a linear motion, and a linear motion-rotation converting unit adapted to convert the linear motions converted by the rotation-linear motion converting unit into rotational motions. At least a part of the linear motion-rotation converting unit is located within the propellant-force generating motor.