Shock Absorber Bumper Cap Structure for Vortex Noise Suppression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing shock absorbers generate abnormal noise due to fluid flow issues, particularly vortices formed between the bumper cap and the shock absorber main body, leading to wind noise.
Innovation Solution
The bumper cap features a cover part with a through hole and protruding parts, including inclined parts that suppress fluid rotation and adjust fluid velocity by varying the flow path, preventing abnormal noise generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a through hole is provided in the bumper cap to allow fluid flow, then the shock absorber can release pressure, but abnormal noise is generated due to fluid vortex formation
Solution Approach 1:
The through hole is divided into multiple segments by providing a plurality of protruding parts that extend into the through hole from the inner surface of the bumper cap. These protruding parts create multiple smaller flow paths instead of a single large hole, which reduces vortex formation and abnormal noise while maintaining pressure release functionality
Solution Approach 2:
The protruding parts act as intermediary structures within the through hole, modifying the fluid flow path and characteristics. These structures serve as a mediator between the pressure release requirement and the noise reduction goal, guiding fluid flow to minimize vortex formation
2Productivity
If the through hole size is increased to improve fluid flow, then pressure release is enhanced, but fluid velocity increases causing more abnormal noise
Solution Approach 1:
The through hole is segmented into multiple flow paths by the protruding parts, allowing increased total flow area while maintaining controlled flow velocity in each segment. This segmentation enables high productivity without the abnormal noise associated with high-velocity single-path flow
Solution Approach 2:
The protruding parts add a third dimension to the flow path control by extending into the through hole from the inner surface. This dimensional addition creates complex three-dimensional flow patterns that reduce vortex formation while maintaining high flow efficiency
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 solution effectively suppresses abnormal noise by controlling fluid flow and preventing vortex formation, enhancing the operational silence of shock absorbers.
Implementation Method 1
a suppression part suppressing rotation of fluid, which has flowed into a space between an inside of the cover part and the shock absorber main body from an outside of the cover part through the through hole
Implementation Method 2
a fluid adjustment part configured to adjust a fluid having flowed into an inside of the cover part from an outside of the cover part through the through hole so that a velocity of the fluid extending outward in the circumferential direction of the through hole varies depending on positions in the circumferential direction of the through hole
Data Source
AI summary
Provided is a bumper cap to be attached to a shock absorber main body, and includes a cover part having an opening at one end, having a bottom part and a through hole penetrating the bottom part at another end, and configured to cover the shock absorber main body, and a plurality of protruding parts protruding from the bottom part of the cover part toward the opening side, and in which a gap is formed between the adjacent protruding parts, in which a suppression part configured to suppress a rotation of a fluid, which has flowed into a space between the inside of the cover part and the shock absorber main body from an outside of the cover part through the through hole, in the cover part is further provided.