Vibration-Damping Device With Flow Changing Protrusions
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional vibration-damping devices generate abnormal noise and have complex structures, making them difficult to manufacture and optimize.
Innovation Solution
A vibration-damping device with a tubular first attachment member and a second attachment member, coupled by an elastic body and a partitioning member that partitions a liquid chamber into two chambers, featuring flow changing protrusions within the limiting passages to alter liquid flow and increase pressure loss, thereby suppressing noise and simplifying the structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a plunger member is used to switch between limiting passages, then vibration damping performance is improved, but abnormal noise is generated and structure becomes complex
Solution Approach 1:
The plunger member is completely removed from the system. Instead of using a moving plunger to switch between limiting passages, the patent uses fixed limiting passages with different flow resistances that automatically guide liquid flow based on pressure differential, thereby eliminating the noise source while maintaining vibration damping functionality.
Solution Approach 2:
The patent introduces a flow resistance difference as an intermediary mechanism between the two limiting passages. By setting different flow resistances in the first and second limiting passages, the system automatically selects the appropriate passage based on vibration conditions without requiring a moving switching component, thus eliminating abnormal noise.
2Reliability
If a plunger member is used to switch between limiting passages, then vibration damping performance is improved, but device complexity increases
Solution Approach 1:
The plunger member and its associated switching mechanism are completely extracted from the system. The patent replaces this complex moving mechanism with simple fixed limiting passages having different flow resistances, dramatically reducing device complexity while preserving the core vibration damping function.
Solution Approach 2:
The system uses the natural pressure differential caused by vibration to automatically direct liquid flow through the appropriate limiting passage. The flow resistance difference causes the liquid to automatically select the path of least resistance, eliminating the need for external control mechanisms or moving parts.
3Object-generated harmful factors
If flow changing protrusions are added to the limiting passage, then abnormal noise is suppressed, but manufacturing complexity increases
Solution Approach 1:
The flow changing protrusions are integrated directly into the limiting passage structure as a unified component. By combining the passage formation and flow control functions into a single molded structure, the patent eliminates the need for separate noise control components, thereby simplifying manufacturing despite the added geometric complexity.
Solution Approach 2:
The patent modifies the geometric parameters of the limiting passage by adding flow changing protrusions with specific shapes and positions. These parameter changes optimize liquid flow patterns to suppress noise while maintaining compatibility with standard manufacturing processes such as injection molding.
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 device effectively absorbs and dampens vibrations while reducing abnormal noise generation and simplifying the manufacturing process by utilizing flow changing protrusions to increase pressure loss and control liquid flow.
Implementation Method 1
An inner peripheral surface of the first limiting passage is provided with a flow changing protrusion that protrudes toward an inner side in a radial direction of the first limiting passage and that changes the flow of a liquid that flows through the first limiting passage
Implementation Method 2
an elastic body that couples the first attachment member and the second attachment member together
Implementation Method 3
The limiting passage includes a first limiting passage that causes resonance with respect to the input of an idle vibration, and a second limiting passage that causes resonance with respect to the input of a shake vibration
Implementation Method 4
a liquid chamber within the first attachment member having a liquid enclosed therein
Data Source
AI summary
A vibration-damping device (10) includes a first attachment member (11), a second attachment member (12), an elastic body (13), and a partitioning member (16). Limiting passages (31, 32) are formed in the partitioning member (16), and the limiting passages (31, 32) include a first limiting passage (31) and a second limiting passage (32). An inner peripheral surface of the first limiting passage (31) is provided with flow changing protrusions (33, 34) that protrude toward an inner side in a radial direction of the first limiting passage (31) and that changes the flow of a liquid (L) that flows through the first limiting passage (31) in an axial direction of the first limiting passage (31). In a vertical cross-sectional view passing through an axis of the first limiting passage (31) and through the flow changing protrusions (33, 34), the first limiting passage (31) and the flow changing protrusion1 (33, 34) have symmetrical shapes with respect to the axis. Protruding ends of the flow changing protrusions (33, 34) form inner peripheral edges of passage holes (33c, 34c) that are open on both sides in the axial direction.