Nutrunner Clutch Mechanism for Tool-Free Torque Threshold Adjustment
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Solution Overview
Problem
Existing nutrunner tools lack an efficient mechanism to prevent over-tightening of fasteners and require tool-assisted adjustments for torque threshold settings.
Innovation Solution
A nutrunner with a clutch mechanism featuring an adjustment collar that allows manual adjustment of a torque threshold without tools, preventing the ring gear from rotating relative to the housing below a set torque and enabling slip when exceeded, integrated with a transmission system for controlled torque application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a clutch mechanism with adjustable torque threshold is added to the nutrunner, then torque control precision and prevention of over-tightening are improved, but device complexity increases
Solution Approach 1:
The clutch mechanism incorporates a adjustable torque threshold that can be dynamically modified by rotating the adjustment collar, allowing the system to adapt to different torque requirements. This dynamic adjustability resolves the contradiction by providing precise torque control when needed while maintaining a relatively simple structure through mechanical adjustment rather than complex electronic controls
Solution Approach 2:
The adjustment collar acts as an intermediary component between the user and the torque threshold setting. By providing a simple rotational interface that mechanically adjusts the clutch engagement characteristics, it enables precise torque control without requiring complex user interaction or sophisticated control systems
2Manufacturing precision
If a tool-assisted adjustment mechanism is used for torque threshold settings, then manufacturing precision is maintained, but ease of operation deteriorates
Solution Approach 1:
The adjustment collar is designed to be rotated and adjusted directly by the user's hand without requiring external tools. This self-service capability allows users to precisely adjust the torque threshold setting through simple rotational movement, maintaining manufacturing precision while dramatically improving ease of operation compared to tool-assisted mechanisms
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 precise torque control for fastener assembly, preventing over-tightening and allowing quick, tool-free adjustment of torque settings, enhancing user convenience and assembly precision.
Implementation Method 1
a spring positioned between the adjustment collar and the ring gear and configured to bias the plurality of rolling elements into engagement with the ring gear
Implementation Method 2
a plurality of rolling elements engaged with the ring gear
Data Source
AI summary
A nutrunner includes a housing, a motor with an output shaft rotatable about a first axis, a head including an output drive rotatable about a second axis, a transmission including a ring gear rotatable about the first axis, and a clutch mechanism. The clutch mechanism includes an adjustment collar rotatable about the first axis, rolling elements engaged with the ring gear, and a spring between the adjustment collar and the ring gear to bias the rolling elements into engagement with the ring gear. The clutch mechanism is configured to prevent the ring gear from rotating when a torque applied to the ring gear is less than a torque threshold, and to permit the ring gear to rotate when a torque applied to the ring gear is greater than or equal to the torque threshold. Rotation of the adjustment collar about the first axis adjusts the torque threshold.