Driving Tool Bumper Design for Uniform Impact Absorption
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing bumper designs for driving tools, such as pneumatic tools, suffer from uneven deformation under impact, leading to localized stress concentration and reduced durability, as well as surface damage from repeated contact with the exhaust port.
Innovation Solution
A bumper with a cylindrical shape featuring an upper portion, intermediate portion, and lower portion, where the outer diameter increases and decreases respectively, allowing for uniform deformation from top to bottom, and incorporating air-gap portions to distribute the impact and prevent damage to the inner periphery surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the bumper upper portion is made asymmetric in shape to the lower portion to absorb impact, then the impact absorption effect is improved, but the stress concentrates on only the deformed portion causing local deterioration and reduced durability
Solution Approach 1:
The bumper is divided into multiple segments along its height, each with different outer diameters (larger at top and bottom, smaller in middle). This segmentation allows different portions to deform independently and uniformly distribute stress, preventing concentration at a single location while maintaining effective impact absorption.
2Force
If the bumper upper portion deforms outward upon impact reception, then the impact is absorbed, but the bulging-out portion comes into strong contact with the exhaust port opening end causing surface damage and impaired durability
Solution Approach 1:
The bumper design incorporates variations in the radial dimension (outer diameter) at different heights. By making the middle portion smaller in outer diameter than the top and bottom portions, the deformation during impact is directed away from the exhaust port region, preventing contact and surface damage while maintaining impact absorption capability.
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 bumper design ensures even impact absorption across its entire structure, enhancing durability and reducing damage to the inner periphery surfaces by distributing the deformation and preventing concentrated stress, thus improving the overall impact absorption and tool longevity.
Implementation Method 1
an absorption effect of the impact is enhanced by means of synergy between the elasticity of the bumper and air cushion
Implementation Method 2
the clearance is closed when the impact of the piston is applied, thereby to compress the air trapped in the lower space
Data Source
AI summary
A bumper of a driving tool has a cylindrical overall shape and also has a space portion expanding downward therein. The bumper is provided with an upper portion, an intermediate portion, and a lower portion. A normal inclined-surface, in which an outer diameter becomes larger from an upper end of a full height of the bumper toward a slightly upper position of the intermediate portion, is formed at a periphery of the upper portion. A bulging-out portion haying the largest outer diameter in the bumper is bulged out, at a periphery of the intermediate portion. A reverse inclined-surface, in which the outer diameter becomes smaller toward downward, is formed at the periphery of the lower portion.