Impact Wrench Anvil Stress Reduction via Chamfered Edges
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing impact wrenches experience durability issues due to stress concentration around the edges of the anvil's rectangular prism, which leads to reduced longevity with extended use.
Innovation Solution
The impact wrench design incorporates a rectangular anvil with chamfered surfaces and concaves on its edges, reducing stress concentration by distributing the impact force more evenly, thereby enhancing durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the anvil has a rectangular prism shape to receive the socket, then the impact wrench can function properly, but stress concentrates around the edges of the rectangular prism reducing durability
Solution Approach 1:
The patent applies local quality by introducing chamfered surfaces and concaves at specific locations (edges and corners) of the rectangular prism anvil. These localized structural modifications change the stress distribution characteristics only where needed, without altering the overall rectangular shape required for socket reception. The chamfered surfaces and concaves create stress relief zones that prevent stress concentration at critical edge and corner locations.
Solution Approach 2:
The patent applies spheroidality by replacing sharp edges and corners with curved surfaces. The chamfered surfaces and concaves introduce curvature elements that distribute stress more evenly compared to sharp geometric transitions. This curvature prevents stress concentration by creating gradual transitions in the stress flow path around the rectangular prism edges and corners.
2Force
If the anvil edges abut firmly against the socket inner surface, then impact force is transmitted effectively, but stress concentration occurs around the rectangular prism edges
Solution Approach 1:
The patent maintains firm contact between the anvil and socket at the main contact surfaces while applying local modifications (chamfered surfaces and concaves) only at the edges and corners. This localized approach preserves effective impact force transmission through the primary contact areas while preventing stress concentration at the vulnerable edge and corner regions.
Solution Approach 2:
The patent converts the potentially harmful stress concentration at edges and corners into beneficial stress distribution patterns. The chamfered surfaces and concaves transform the stress flow, redirecting it away from concentrated points and distributing it more evenly across the anvil structure, thereby converting what would be weakness points into strength-enhancing features.
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 modified anvil design significantly reduces stress on the rectangular prism, leading to increased durability and extended tool life by distributing the impact force more effectively.
Implementation Method 1
The impact wrench design incorporates a rectangular anvil with chamfered surfaces and concaves on its edges, reducing stress concentration by distributing the impact force more evenly
Data Source
AI summary
An anvil receives less stress around a rectangular prism and has higher durability. An impact wrench includes a motor, a hammer rotatable by the motor, a body accommodating the motor and the hammer, and an anvil protruding frontward from the body and to be struck in a rotation direction by the hammer. The anvil includes a blade to be in contact with the hammer, a cylinder located frontward from the blade, a rectangular prism located frontward from the cylinder, at least one chamfered surface each at an edge of the rectangular prism, and a concave on a rear end of the at least one chamfered surface.