Ring Gear Alignment Features for Impact Tool Stability
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Solution Overview
Problem
Existing power tools face challenges in maintaining the fixed positions of motor and gear assemblies during operation, leading to potential misalignment and reduced performance.
Innovation Solution
Incorporation of a ring gear alignment feature with piloting features, such as grooves and ridges, to securely couple the ring gear, front housing, and endbell, preventing movement and rotation relative to the motor assembly, thus ensuring proper alignment and operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If piloting features are added to the ring gear and housing to prevent movement and maintain alignment, then the positional stability and operational reliability improve, but the device complexity increases
Solution Approach 1:
The piloting features are integrated directly into the ring gear and housing structures during manufacturing, combining the alignment function with the existing structural components rather than adding separate alignment mechanisms. This merging approach provides reliable positional stability while minimizing the increase in overall device complexity.
2Ease of manufacture
If multiple separate components are used for the ring gear assembly, then the ease of manufacture improves, but the number of parts increases leading to higher assembly complexity
Solution Approach 1:
The ring gear is designed as an integrated component with built-in piloting features that combine multiple functions (gear transmission, alignment, and positioning) into a single part. This reduces the total number of components while maintaining manufacturing flexibility through modular assembly approaches.
3Ease of operation
If the ring gear is freely positioned without alignment features, then the ease of assembly improves, but the manufacturing precision and alignment accuracy deteriorate
Solution Approach 1:
The piloting features are pre-formed on the ring gear and housing during manufacturing, establishing precise alignment references before assembly. This preliminary preparation ensures high alignment accuracy while the simple ridge-groove mechanism maintains ease of assembly by providing clear alignment cues during the assembly process.
Data Source
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AI summary
A hand-held power tool is provided that includes a housing, a motive source, a front endbell, an output shaft, a front housing, and a gear set assembly. The output shaft protrudes from an output end at the front endbell of the housing. The output shaft is also functionally coupled to the motive source such that the output shaft rotates in response to activation of the motive source when the motive source is supplied with power. The gear set assembly is located in an interior space of the front housing, and is configured to transfer rotation from the motive source to an output spindle. The gear set assembly also includes a ring gear that surrounds a portion of the output shaft and abuts the front endbell of the housing. A set of piloting features is provided that is configured to prevent movement of the ring gear relative to the motive source and the front housing, or the front housing relative to the housing.