Vibration Damping Support Device with Overlapping Restraining Members
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Solution Overview
Problem
Conventional vibration-damping support devices experience relative displacement between the upper restraining member and the second connection target, leading to noise generation due to rubbing, particularly caused by the lower mount rubber's compressive deformation and swelling, which presses the upper restraining member.
Innovation Solution
A vibration-damping support device with a novel structure that includes an inner shaft member, upper and lower mount rubbers, and restraining members bonded to the rubbers, where the lower restraining member overlaps with the second connection target and the upper restraining member, preventing the lower mount rubber from pressing the upper restraining member, thereby limiting displacement and stabilizing vibration damping characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the upper restraining member and second connection target are superposed rigidly without bonding, then the structure is simple, but relative displacement occurs causing noise due to rubbing
Solution Approach 1:
The patent introduces an upper mount rubber as an intermediary element between the upper restraining member and the second connection target. This rubber component absorbs relative displacement through elastic deformation, preventing direct contact and rubbing between the rigid members, thereby eliminating noise while maintaining structural simplicity.
2Reliability
If the lower mount rubber is subjected to large compressive deformation, then the vibration damping ability is improved, but the rubber swells and pushes the upper restraining member causing displacement
Solution Approach 1:
The upper mount rubber acts as a mediator that absorbs the swelling effect of the lower mount rubber. When the lower rubber swells due to compression, the upper rubber accommodates this deformation through its elastic properties, preventing the swelling from pushing the upper restraining member and causing displacement.
Solution Approach 2:
The patent distributes the vibration damping function across multiple components (upper and lower mount rubbers) arranged in different spatial dimensions. This multi-layered configuration allows each rubber component to handle specific aspects of deformation, with the upper rubber specifically managing the swelling effect in the radial direction while the lower rubber provides primary compression damping.
3Reliability
If a rigid upper restraining member is bonded to the upper mount rubber, then the spring characteristics can be adjusted, but the rigid member displaces relative to the second connection target under large vertical input
Solution Approach 1:
The patent modifies the physical state and mechanical properties of the upper mount rubber to enhance its ability to accommodate displacement. By selecting rubber materials and formulations with appropriate elasticity and damping characteristics, the system can adjust spring characteristics while simultaneously absorbing large vertical inputs without causing relative displacement of the rigid restraining member.
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 configuration effectively prevents noise and stabilizes vibration damping by limiting the relative displacement of the upper restraining member, reducing noise caused by rubbing and enhancing the vibration damping performance.
Implementation Method 1
compression spring of the upper mount rubber and the lower mount rubber will support a load in the axial direction in a vibration damping manner
Implementation Method 2
vibration-damping support device interposed between connection targets that make up a vibration transmission system and providing vibration damping linkage therebetween
Implementation Method 3
the lower mount rubber being subjected to a large compressive deformation in the axial direction and swelling so as to be inserted into the mounting hole of the second connection target, thereby pushing the upper restraining member and the upper mount rubber upward
Implementation Method 4
a large input in the vertical direction sometimes causes relative displacement of the upper restraining member and the second connection target, generating noise due to rubbing
Data Source
AI summary
A vibration-damping support device including: an inner shaft member to be attached to a first connection target; upper and lower mount rubbers externally fitted onto the inner shaft member; and upper and lower restraining members bonded to the upper and lower mount rubbers respectively and configured to be superposed against the second connection target. The upper and lower restraining members are configured to project to a peripherally inside of an opening edge of a mounting hole of the second connection target so that the upper and lower restraining members overlap with each other as viewed in axial direction there. The lower mount rubber includes a slot extending annularly on its outer periphery and an inner peripheral convex part projecting inward from an inside of the slot so as to have a curved shape that is convex inward at the inside of the slot.