Power Tool Attachment Part Torque Sensor Integration
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Solution Overview
Problem
Existing power tool attachment parts, such as crowfoots, face challenges in accurately measuring torque due to internal measurement limitations within the power tool, especially when using straight gear wheels instead of helical ones, which are typically required for accurate torque measurement.
Innovation Solution
A power tool attachment part with an elongate housing containing an input and output gear wheel, an intermediate gear wheel, a socket with splines for secure connection, and a torque sensor that measures strain on the socket to determine torque accurately, regardless of gear wheel type, using optical, SAW, or strain gauge technologies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If internal measurement in the power tool is used, then the measurement system is simple, but the torque measurement accuracy is insufficient
Solution Approach 1:
The patent introduces a torque sensor as an intermediary device between the power tool and the attachment part. This sensor specifically measures the torque at the output gear wheel, providing accurate torque data without requiring complex internal modifications to the power tool itself. The torque sensor acts as a mediator that bridges the gap between the power tool's internal measurements and the actual torque applied by the attachment part.
2Adaptability or versatility
If helical gear wheels are used, then torque measurement is accurate, but the gear wheel design is limited
Solution Approach 1:
The patent creates a universal torque measurement system that works with both helical and straight gear wheels. By placing the torque sensor at the output gear wheel rather than relying on the gear tooth structure itself, the system becomes adaptable to different gear wheel designs. This universal approach allows the same measurement system to accurately measure torque regardless of whether helical or straight gear wheels are used in the attachment part.
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
This solution enables precise torque measurement directly on the output gear wheel, independent of gear wheel design, providing accurate readings for both straight and helical gear wheels, enhancing measurement accuracy and versatility.
Implementation Method 1
a torque sensor configured to measure the strain on the socket and thereby obtain a measure of the torque at the output gear wheel
Implementation Method 2
the light transmitter is configured to transmit light through the first light slits and the second slits and the light receiver is configured to detect light that has been transmitted through the first light slits and the second light slits, the amount of light transmitted through the first light slits and the second light slits depending on their relative alignment and providing a measure of the torque at the output gear wheel
Data Source
AI summary
A power tool attachment part for a power tool, comprising: an elongate housing including an upper housing part and a lower housing part interconnected with the upper housing part, an input gear wheel configured to be connected to an output shaft of a power wrench, which input gear wheel is arranged at a first end of the housing, an output gear wheel with an output connection, which output gear wheel is arranged at a second end of the housing, an intermediate gear wheel arranged inside the housing and configured to transmit rotation of the input gear wheel to the output gear wheel, a socket arranged concentrically with and radially inside the output gear wheel, and a torque sensor configured to measure the strain on the socket and thereby obtain a measure of the torque at the output gear wheel.