Integrated Bearing Torque Sensing for Compact Strain Wave Gearing
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Solution Overview
Problem
Existing torque detectors require additional space and components for attaching strain elements, making them bulky and complex, especially in motor and reducer systems, where compactness and reduced component count are desirable.
Innovation Solution
A bearing unit with integrated raceway rings and a strain element, where the strain element is formed with continuous annular parts and ribs, allowing for torque detection without separate attachment components or space, and is integrated with the bearing unit for compact assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a strain element is attached using separate attachment components and fastening fittings, then the torque detection function is achieved, but the device becomes bulky and complex with increased installation space requirements
Solution Approach 1:
The strain element is integrated directly into the bearing unit structure, merging the torque detection function with the bearing support function. The strain element forms an integral part of the bearing assembly, eliminating the need for separate attachment components and fastening fittings, thereby reducing device complexity while maintaining torque detection capability
Solution Approach 2:
The bearing unit serves multiple functions simultaneously: it provides mechanical support through the bearing while also functioning as a torque detection device through the integrated strain element. This multi-functionality eliminates the need for separate torque detection components, reducing overall device complexity
2Reliability
If additional attachment components and fastening fittings are used for the strain element, then secure attachment is achieved, but the unit weight increases and compactness is reduced
Solution Approach 1:
The strain element and bearing unit are merged into a single integrated structure, eliminating the need for separate attachment components and fastening fittings. This integration removes the weight of additional components while maintaining secure attachment through the integral design
3Reliability
If separate attachment components and fastening fittings are used for the strain element, then secure mounting is achieved, but the installation space requirement increases
Solution Approach 1:
The strain element is merged with the bearing unit into a single integrated component, eliminating the need for separate attachment components and fastening fittings. This integration significantly reduces the installation space required, as the torque detection function is achieved within the existing bearing unit footprint without requiring additional mounting space
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
Enables compact, lightweight, and precise torque detection by eliminating the need for additional components and space, reducing assembly complexity and thermal strain issues, while improving detection precision.
Implementation Method 1
the strain element, which has predetermined elastic characteristics, is bridged between, for example, a rotating shaft and a load-side member, strain produced in the strain element is measured
Data Source
AI summary
A bearing unit is provided with a strain element for torque detection. The strain element is provided with a first annular part attached to a rotation-side member, a second annular part attached to a load-side member, and a plurality of ribs serving as strained parts linking the first annular part and the second annular part together. One of an inner race and an outer race is integrally formed on the first annular part of the strain element. Deformation, which occurs in the ribs of the strain element due to torque exerted on the rotation-side member from the load-side member, is detected by a strain gauge, etc., and converted to torque. The strain element for torque detection can be incorporated into a motor, a reducer, or another rotary propulsion unit without the need for a dedicated installation space and without the need for fastening fittings, etc.