Torsional Strain Sensing Device with Flat Frame Surfaces
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Solution Overview
Problem
Existing power tools face challenges in accurately measuring torque due to the inconvenience of applying strain gauges to disc-shaped torque transducers, particularly the ring-shaped web design which complicates bonding and reduces detection accuracy.
Innovation Solution
A torsional strain sensing device with a cylindrical hub and frame design, featuring flat lateral outer surfaces for easy strain sensor attachment and reduced area moment of inertia, enhancing detection accuracy and convenience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a disc-shaped torque transducer with a ring-shaped web is used, then the structure can measure torque, but it becomes inconvenient to apply strain gauges and reduces detection accuracy
Solution Approach 1:
The patent inverts the conventional disc-shaped web structure into a frame structure with flat lateral outer surfaces. This inversion transforms the bonding surface from a curved recessed area to a flat accessible surface, making strain gauge application convenient while enhancing detection accuracy through increased torsional deformation visibility.
Solution Approach 2:
The patent transitions from a two-dimensional disc-shaped web to a three-dimensional frame structure with protruding flat surfaces. This dimensional change provides accessible bonding surfaces that extend outward from the central axis, enabling easy strain gauge attachment while increasing the moment arm for torsional deformation measurement.
2Volume of moving object
If the web is located in a recessed surface surrounded by the rim, then the structure is compact, but it adds difficulties in bonding the strain gauge
Solution Approach 1:
The patent segments the monolithic disc-shaped web into a frame structure with separate sidewalls and connecting walls. This segmentation creates distinct flat bonding surfaces on the outer periphery while maintaining the compact overall structure, allowing easy strain gauge bonding without compromising compactness.
Solution Approach 2:
The frame structure acts as an intermediary between the torque transmission path and the strain gauge measurement system. The flat lateral outer surfaces serve as intermediate bonding surfaces that facilitate strain gauge attachment while transmitting torsional deformation for accurate measurement.
3Measurement precision
If a frame structure with flat lateral outer surfaces is used, then strain sensors can be easily attached and detection accuracy improves, but the device complexity increases
Solution Approach 1:
The frame structure serves multiple functions simultaneously: it transmits torque from the drive collar, provides flat bonding surfaces for strain gauges, and maintains structural compactness. This multi-functionality reduces the need for separate components, thereby limiting the increase in device complexity while achieving improved measurement precision.
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 facilitates the assembly of commercially available strain sensors, increases torsional deformation, and improves detection accuracy, making the power tool more effective in measuring applied torque.
Implementation Method 1
a plurality of strain sensors fixed on the first flat lateral outer surface and second flat lateral outer surface of the frame of the torsional strain sensing device
Data Source
AI summary
A torsional strain sensing device comprises a cylindrical hub and a frame. The frame surrounds the cylindrical hub and includes a first sidewall, an opposite second sidewall, a first connecting wall extended between the first sidewall and the second wall at one end, and a second connecting wall extended between the first sidewall and the second sidewall at the opposite end. The first sidewall has a first flat lateral outer surface, and the second sidewall has a second flat lateral outer surface. The first and second lateral outer surfaces are adapted for attachment of strain sensors thereon. A first cavity and a second cavity oppositely defined between the cylindrical hub and the frame.