Vibration Damping Device with Flow-Changing Protrusions
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Solution Overview
Problem
Conventional vibration damping devices experience issues with abnormal noise suppression, structural complexity, and manufacturing difficulties, particularly due to increased dynamic spring constants caused by clogging of restriction passages during unintentional vibrations with high frequencies and small amplitudes.
Innovation Solution
The vibration damping device incorporates flow-changing protrusions within the communicating passage between liquid chambers, which alter the liquid flow direction and increase pressure loss, thereby absorbing and attenuating vibrations effectively, while maintaining a simplified structure and facilitating manufacture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a plunger member is used to switch between restriction passages, then vibration damping performance is improved, but abnormal noise occurs and structure becomes complex
Solution Approach 1:
The invention removes the plunger member from the system and extracts only the essential function of switching liquid flow paths. The flow-changing protrusions replace the plunger member's switching function without requiring a movable component, thereby eliminating abnormal noise while maintaining vibration damping performance.
Solution Approach 2:
The invention creates a dynamic liquid flow path switching mechanism using flow-changing protrusions that respond to vibration frequencies. The protrusions passively redirect liquid flow based on vibration intensity, achieving adaptive vibration damping without mechanical actuators or complex control systems.
2Reliability
If restriction passages are used for vibration damping, then vibration absorption is improved, but dynamic spring constant increases during unintentional vibrations
Solution Approach 1:
The invention uses multiple flow-changing protrusions positioned at different locations within the communicating passage. During unintentional vibrations with small amplitudes, not all protrusions are activated simultaneously, allowing partial liquid flow through the passage and preventing excessive increase in dynamic spring constant while still providing vibration absorption.
3Reliability
If flow-changing protrusions are added to the communicating passage, then vibration attenuation is improved, but manufacturing complexity increases
Solution Approach 1:
The invention integrates the flow-changing protrusions directly into the partition member structure that already exists in the vibration damping device. By combining the partitioning function and the flow control function into a single component, the manufacturing process is simplified compared to adding separate protrusion components that would require additional assembly steps.
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 effectively suppresses abnormal noise and maintains ride comfort by adjusting pressure loss based on flow rates, ensuring efficient vibration absorption across various frequencies and reducing dynamic spring constants, especially during unintentional vibrations.
Implementation Method 1
increase pressure loss, thereby absorbing and attenuating vibrations effectively
Implementation Method 2
absorbing and attenuating vibrations effectively
Implementation Method 3
an elastic body configured to couple the attachment members to each other
Data Source
AI summary
A vibration damping device (10) includes a first attachment member (11) and a second attachment member (12), an elastic body (13) configured to couple the attachment members (11 and 12) to each other, and partition members (16) configured to partition a liquid chamber in the first attachment member (11) in which a liquid (L) is sealed into the first liquid chamber (14) and the second liquid chamber (15). A communicating passage (30) configured to communicate the first liquid chamber (14) with the second liquid chamber (15) is provided in the partition members (16). Flow-changing protrusions (31 and 32) protruding inward in a radial direction of the communicating passage (30) and configured to change a flow of the liquid flowing in the communicating passage (30) in an axial direction of the communicating passage (30) are provided in an inner circumferential surface of the communicating passage (30). The communicating passage (30) and the flow-changing protrusions (31 and 32) are formed symmetrically with respect to an axis (O) of the communicating passage (30) when viewed in a longitudinal cross section passing through the axis (O) and the flow-changing protrusions (31 and 32). Projecting ends of the flow-changing protrusions (31 and 32) form inner circumferential edges of passing holes (31c and 32c) which are open toward both sides in the axial direction. According to the vibration damping device (10), occurrence of abnormal noise is suppressed while product features are secured so that simplification of a structure and facilitation of manufacture can be achieved.