Brake Position Sensor Unit With Planetary Gear Verification
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Solution Overview
Problem
Existing brake sensors in aircraft systems lack reliable verification mechanisms to confirm brake engagement and release, particularly in take-off environments, leading to potential safety issues and system damage due to incomplete deactivation.
Innovation Solution
A brake position sensor unit incorporating planetary gears and a brake verification mechanism (BVM) that activates a microswitch upon brake engagement, ensuring reliable communication to the controller about brake status, with enhanced reliability through increased travel length of the microswitch and reduced resolver rotation speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a brake sensor is used without a verification mechanism, then the device complexity is reduced, but the reliability of brake status verification deteriorates
Solution Approach 1:
The brake verification mechanism is integrated directly into the brake sensor unit, combining the brake sensing function with the verification function in a single compact assembly. The planetary gears and microswitch are incorporated within the same housing as the resolver, eliminating the need for separate verification components and reducing overall system complexity while maintaining high reliability.
Solution Approach 2:
Planetary gears are introduced as an intermediary mechanical element between the brake shaft and the microswitch. These gears amplify the rotational movement of the brake shaft and convert it into sufficient linear displacement to actuate the microswitch, enabling reliable verification without requiring complex direct coupling mechanisms.
2Measurement precision
If the microswitch travel length is increased to improve verification reliability, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
Planetary gears serve as a mechanical intermediary that amplifies the rotational displacement of the brake shaft. This gear amplification mechanism provides the necessary travel length for the microswitch without requiring an excessively long microswitch stroke, thereby achieving precise detection while maintaining compact dimensions and simple structure.
Solution Approach 2:
The planetary gear system changes the displacement parameter by providing mechanical amplification. A small rotation of the brake shaft is converted into a larger linear displacement at the microswitch, effectively increasing the measurement precision without proportionally increasing the physical dimensions or complexity of the microswitch mechanism.
3Reliability
If planetary gears are added to activate the verification mechanism, then the reliability of brake verification is improved, but the device complexity increases
Solution Approach 1:
The planetary gear mechanism is merged with the existing brake sensor components, sharing the same housing, shaft, and mounting structure. This integration allows the verification function to be added without proportionally increasing overall device complexity, as the gears utilize the existing structural framework of the brake sensor unit.
Solution Approach 2:
The planetary gears are directly driven by the rotation of the brake shaft itself, utilizing the existing motion in the system. The verification mechanism is self-actuating through the gear train, eliminating the need for separate actuators, sensors, or control systems, thereby minimizing the increase in complexity while achieving reliable verification.
4Reliability
If the resolver rotation speed is reduced to enhance reliability, then the measurement precision is improved, but the productivity of brake response decreases
Solution Approach 1:
Planetary gears act as a speed reduction intermediary between the brake shaft and the resolver. The gear train reduces the rotational speed transmitted to the resolver while maintaining the accuracy of position information, thereby improving communication reliability without sacrificing brake response productivity, as the verification mechanism operates independently at higher speed.
Data Source
AI summary
A brake position sensor unit includes a unitary brake shaft that transmits braking torque to a article to be slowed, connects directly to a brake unit, connects to a resolver and has a plurality of planetary gears rotating thereabout to activate a sensor when the brake unit is set.