Dynamic Damper With Segmented Through Hole
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing dynamic dampers for rotational shafts, such as drive shafts in automobiles, face issues with water penetration due to material fatigue and reduced tightening force over time, leading to inefficient mounting and increased production costs, as well as excessive deformation of the inner wall of the damper.
Innovation Solution
The dynamic damper features a through hole with varying inner diameters at different axial ends, allowing for improved contact with the rotational shaft to prevent water penetration and reducing the required press-fit force, while minimizing deformation and maintaining effective sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the inner diameter of the boss is reduced to improve contact with the rotational shaft, then water penetration is prevented, but the press-fit force required increases and production costs rise
Solution Approach 1:
The through hole is segmented into two distinct sections with different inner diameters: a first section with a smaller inner diameter for water prevention and a second section with a larger inner diameter for easier press-fitting. This segmentation allows each section to fulfill its specific function without compromising the other.
Solution Approach 2:
Different sections of the through hole are given different local qualities (inner diameters) suited to their specific functions. The first section has a smaller diameter for sealing, while the second section has a larger diameter for mounting, optimizing both water prevention and ease of manufacture locally.
2Reliability
If the inner diameter of the boss is reduced to improve contact with the rotational shaft, then water penetration is prevented, but additional press-fit apparatus is required and productivity decreases
Solution Approach 1:
The through hole is segmented into two distinct sections with different inner diameters: a first section with a smaller inner diameter for water prevention and a second section with a larger inner diameter for easier press-fitting. This segmentation allows each section to fulfill its specific function without compromising the other.
Solution Approach 2:
Different sections of the through hole are given different local qualities (inner diameters) suited to their specific functions. The first section has a smaller diameter for sealing, while the second section has a larger diameter for mounting, optimizing both water prevention and ease of manufacture locally.
3Reliability
If increased force is applied to press-fit the rotational shaft into the boss, then contact is improved, but the inner wall of the boss is excessively stressed and deformed
Solution Approach 1:
The through hole is segmented into two distinct sections with different inner diameters: a first section with a smaller inner diameter for water prevention and a second section with a larger inner diameter for easier press-fitting. This segmentation allows each section to fulfill its specific function without compromising the other.
Solution Approach 2:
Different sections of the through hole are given different local qualities (inner diameters) suited to their specific functions. The first section has a smaller diameter for sealing, while the second section has a larger diameter for mounting, optimizing both water prevention and ease of manufacture locally.
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 enhances the attachment of the rotational shaft, prevents water penetration, and maintains the damper's performance by ensuring sufficient contact at both ends and reducing the force needed for press-fitting, thus improving efficiency and durability.
Implementation Method 1
an elastic connector for connecting the boss and the weight radially
Implementation Method 2
The dynamic damper has a function to absorb the vibrational energy of the rotational shaft by converting the vibrational energy into vibrational energy of the dynamic damper by way of resonance
Implementation Method 3
the inner wall surface of the through hole having the inner diameter D2 can be in sufficient contact with the outer circumferential surface of the rotational shaft at the one end such that penetration of water between the surfaces can be prevented effectively
Data Source
AI summary
A dynamic damper in which the inner diameter (D2) of a first hole part formed at the axial one end part of a body part overlapped with a weight part in the radial direction is set smaller than the inner diameter (D3) of a second hole part formed at the axial other end part of the body part not overlapped with the weight part in the radial direction and tightened with a band member (D3>D2). The outer diameter (D1) of a drive shaft to be press-fitted into the first and second hole parts is set larger than the inner diameter (D2) of the first hole part and the inner diameter (D3) of the second hole part (D1>D3>D2).