Impact Tool Hammer Groove for Wear Reduction
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Solution Overview
Problem
Existing impact tools face challenges in maintaining operability without significant size increase, which can lead to reduced efficiency and increased wear on components.
Innovation Solution
The impact tool design incorporates a spindle with a flange, an anvil with radial projections, and a hammer with inward projections and grooves, allowing for efficient energy transfer while minimizing axial size increase by optimizing the contact area between the hammer and anvil projections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the contact area between hammer projection and anvil projection is increased to reduce wear, then the service life of hammer projections is extended, but the axial size of the tool increases
Solution Approach 1:
The groove is provided only at the boundary between the base and hammer projection, creating a localized stress relief zone exactly where contact stress concentrates during impact. This local modification increases wear resistance at the critical contact area without requiring overall enlargement of the hammer projection or increase in axial dimensions.
Solution Approach 2:
Instead of increasing the contact area in the axial direction (which would increase tool size), the groove modifies the stress distribution in the radial and circumferential directions. By creating a stress relief pathway in different dimensional orientations, the design extends service life without compromising the compact axial profile.
2Ease of operation
If the size of the impact tool is reduced, then operability is improved, but the torque output decreases
Solution Approach 1:
The hammer is segmented into distinct functional zones: the base providing structural support, the hammer projection providing impact force, and the groove providing stress relief. This segmentation allows each component to be optimized for its specific function, maintaining high torque output in a compact configuration.
Solution Approach 2:
The hammer structure combines different material properties and structural characteristics - the rigid base and hammer projection for force transmission, and the groove-induced stress distribution pattern for durability. This composite structural approach maximizes torque density within limited axial 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
This design reduces wear on the hammer projections, extends their service life, and maintains high torque without increasing the tool's axial dimensions, enhancing operational efficiency and usability.
Implementation Method 1
a hammer including a base surrounding the spindle shaft, a front ring protruding frontward from an outer circumference of the base, and a hammer projection protruding radially inward from an inner circumferential surface of the front ring to strike the anvil projection in a rotation direction
Data Source
AI summary
To improve operability it is desireable to decrease the size of an impact tool. The impact tool includes a motor, a spindle including a spindle shaft and a flange. An anvil of the tool includes an anvil shaft and an anvil projection. A hammer of the tool includes a base surrounding the spindle shaft, a front ring protruding frontward from an outer circumference of the base, and a hammer projection to strike the anvil projection in a rotation direction. The base has a groove at a boundary with the hammer projection. One of ordinary skill in the art would appreciate that the arrangement disclosed herein results in space savings that allows for overall decrease in the size of an impact too.