Multi-piece Shaft Assembly for Powered Ratchet Torque Transmission
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Solution Overview
Problem
Existing powered ratchet tools face challenges in efficiently transmitting torque and accommodating complex geometries, leading to increased manufacturing costs and potential vibration issues.
Innovation Solution
A powered ratchet tool design featuring a multi-piece shaft assembly with couplers made of powdered metal, allowing for different materials and manufacturing processes to optimize torque transmission and reduce manufacturing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single-piece shaft assembly is used, then manufacturing is simpler, but torque transmission efficiency and vibration control are reduced
Solution Approach 1:
The shaft assembly is divided into multiple segments (first shaft portion, second shaft portion, third shaft portion) connected by couplers. This segmentation allows each portion to be optimized for specific functions: the first portion for torque transmission, the second for geometric accommodation, and the third for vibration control, while maintaining overall reliability without sacrificing manufacturing feasibility
2Stability of the object's composition
If complex geometries are accommodated in a single piece, then structural integrity is maintained, but manufacturing complexity and cost increase
Solution Approach 1:
The complex geometry is distributed across multiple shaft portions connected by couplers. Each coupler is designed with specific geometric features (e.g., eccentric pins, offset axes) that accommodate complex movements while allowing individual portions to be manufactured separately using optimized processes for each segment
Solution Approach 2:
Different portions of the shaft assembly may utilize different materials or material properties optimized for their specific functions. The couplers and shaft portions can be made from different alloys or treated differently to optimize both structural integrity and manufacturability of each component
3Ease of manufacture
If traditional manufacturing processes are used for all components, then manufacturing simplicity is maintained, but cost and precision are reduced
Solution Approach 1:
Different manufacturing processes are applied to different components based on their specific requirements. Critical precision components (couplers, bearing surfaces) receive precision manufacturing treatments, while less critical portions use simpler processes. This local optimization of manufacturing quality achieves high precision where needed without unnecessarily increasing cost overall
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 enhances torque transmission efficiency, reduces manufacturing costs by utilizing powdered metal for complex couplers, and minimizes vibration through balanced components.
Implementation Method 1
the pin is offset from the first axis such that rotation of the shaft assembly about the first axis causes reciprocation of the yoke about the second axis
Implementation Method 2
the first coupler is made of powdered metal
Data Source
AI summary
A powered ratchet tool includes a housing, a head portion of the housing, a drive assembly, a yoke supported within the head portion, an anvil, a pawl, and a shaft assembly. The drive assembly includes an output rotatable about a first axis. The yoke is pivotable about a second axis perpendicular to the first axis. The anvil extends from the head portion and is configured to engage a socket. The pawl is moveable between a first and a second position to switch the direction of rotation of the anvil. The shaft assembly extends between the output and the yoke and is formed as a multi-piece construction. The shaft assembly includes a shaft extending along the first axis, a first coupler fixed to a first end of the shaft, a second coupler fixed to the second end of the shaft, and a pin extending from the second coupler to the yoke.