Dynamic Damper Protruding Section Frequency Tuning
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Solution Overview
Problem
Conventional dynamic dampers face difficulties in adjusting the natural frequency and preventing the mass body from falling off due to the limitations in adjusting the axis-perpendicular dimension of the elastic coupling section.
Innovation Solution
The dynamic damper design includes a tubular member, a mass body with a protruding section, an elastic coupling section, and a fastening member, where the protruding section protrudes from the mass body and is molded integrally with it, allowing for easier adjustment of the spring constant and natural frequency by adjusting the amount of protrusion, and preventing the mass body from falling off by overlapping with the projecting section.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the outside diameter of the head of a bolt for fastening the tubular member is set to be larger than the inside diameter of the mass body to prevent the mass body from falling off, then the mass body is prevented from falling off, but the axis-perpendicular dimension of the elastic coupling section cannot be adjusted freely to tune the natural frequency
Solution Approach 1:
The invention divides the mass body into two functional parts: the main tubular mass body and a protruding section extending from its inner peripheral surface. The protruding section acts as a separate element that can be positioned to overlap with the projecting section of the tubular member, providing mechanical interference to prevent falling off. This segmentation allows the axis-perpendicular dimension of the elastic coupling section (distance between mass body and tubular member) to be adjusted independently for natural frequency tuning, while the protruding section provides the safety function against falling off.
2Adaptability or versatility
If the axis-perpendicular dimension of the elastic coupling section is adjusted by changing the inside diameter of the mass body and outside diameter of the tubular member to tune the natural frequency, then the natural frequency can be adjusted, but the structure becomes more complex and manufacturing becomes more difficult
Solution Approach 1:
Instead of adjusting the axis-perpendicular dimension by changing the diameters of the mass body and tubular member (which affects the elastic coupling section thickness), the invention uses the protruding section to provide the mechanical interference function. This allows the elastic coupling section's axis-perpendicular dimension to be adjusted more easily by modifying the protruding section's geometry or position, simplifying the manufacturing process while maintaining natural frequency adjustability.
3Reliability
If the protruding section and projecting section overlap in the axial direction at any rotational position, then the mass body is securely prevented from falling off, but the structure becomes more complex
Solution Approach 1:
The protruding section serves multiple functions: it provides mechanical interference with the projecting section to prevent the mass body from falling off, and it allows for adjustment of the elastic coupling section's spring constant by modifying its geometry. This multi-functionality reduces the need for additional components, thereby minimizing structural complexity while achieving reliable fall-off prevention.
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 facilitates the adjustment of the natural frequency and prevents the mass body from falling off by allowing for easier adjustment of the spring constant and reducing the risk of bonding failures, while also reducing the weight and variations in the natural frequency.
Implementation Method 1
The elastic coupling section is formed of a rubber elastic body that couples the inner peripheral surface of the mass body and the protruding section to the outer peripheral surface of the tubular member
Data Source
AI summary
A dynamic damper includes a tubular member, a mass body, a protruding section, an elastic coupling section, a fastening member, and a projecting section. The protruding section is positioned toward the second end of the tubular member with respect to the projecting section. The projecting section and the protruding section overlap in the axial direction of the tubular member at any position reached by relatively rotating the mass body around the axial center of the tubular member with respect to the tubular member.