Strut Mount Stopper Rubber Elasticity Control
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Solution Overview
Problem
Conventional strut mounts experience increased elasticity and generate impact forces or abnormal noise when the inner and outer members shift relative to each other in the axial and prying directions due to vibration input, causing misalignment of their center axes.
Innovation Solution
A strut mount design featuring an annular inner member, an outer member, and a body rubber with stopper rubbers that include a pedestal protrusion portion and a tip protrusion portion, where the tip protrusion portion has lower elasticity than the pedestal portion, allowing controlled absorption and suppression of vibrations by gradually increasing elasticity as the supporting portion contacts the pedestal protrusion portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the body rubber has high elasticity to allow elastic shifting between inner and outer members, then the shock absorption capability is improved, but impact force and abnormal noise are generated when the center axes tilt due to vibration
Solution Approach 1:
The patent changes the elasticity parameter of the stopper rubber by creating a dual-structure with pedestal and tip protrusion portions having different elasticities. The tip protrusion portion has lower elasticity than the pedestal protrusion portion, allowing the stopper rubber to provide gradual resistance and suppress impact forces and abnormal noise while maintaining shock absorption capability.
Solution Approach 2:
The patent applies local quality by making different portions of the stopper rubber have different elastic properties. The tip protrusion portion has lower elasticity to contact the supporting portion first and suppress tilt, while the pedestal protrusion portion has higher elasticity to provide gradual shock absorption, thus resolving the contradiction between shock absorption and impact suppression.
2Object-generated harmful factors
If the stopper rubber has high elasticity to suppress sudden shifts, then impact force is reduced, but the center axis misalignment and vibration absorption are compromised
Solution Approach 1:
The patent segments the stopper rubber into two functional portions: the tip protrusion portion with lower elasticity that contacts the supporting portion first to suppress tilt and maintain center axis alignment, and the pedestal protrusion portion with higher elasticity that provides gradual shock absorption. This segmentation allows both impact force suppression and center axis stability.
3Loss of energy
If the inner member and outer member are allowed to shift freely to absorb vibration, then vibration absorption is improved, but elasticity increases and generates abnormal noise
Solution Approach 1:
The patent implements a dynamic elasticity control mechanism where the stopper rubber transitions from low elasticity (tip protrusion portion contacting supporting portion) to high elasticity (pedestal protrusion portion engaged) as the shifting progresses. This dynamic adjustment allows vibration absorption while suppressing abnormal noise generation through controlled resistance.
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 absorbs vibrations and suppresses impact forces and abnormal noise by maintaining low elasticity until contact, then increasing it to manage shifts and prevent sudden elasticity increases, ensuring reliable noise reduction and stability.
Implementation Method 1
a tip protrusion portion which protrudes outward in the axial direction from the pedestal protrusion portion, contacts the supporting portion, and has an elasticity in the axial direction lower than that of the pedestal protrusion portion
Implementation Method 2
The pedestal protrusion portion and the tip protrusion portion taper outward in the axial direction
Implementation Method 3
a body rubber which is disposed between the inner member and the outer member and supports the inner member and the outer member such that the inner and outer members are elastically shiftable relative to each other
Data Source
AI summary
A strut mount includes an inner member, an outer member, and a body rubber. A stopper rubber which protrudes outward in an axial direction is disposed on the body rubber. The outer member includes a supporting portion which covers the stopper rubber from outside thereof in the axial direction. The stopper rubber includes a pedestal protrusion portion which protrudes outward in the axial direction from the inner member and a tip protrusion portion which protrudes outward in the axial direction from the pedestal protrusion portion, contacts the supporting portion, and has an elasticity in the axial direction lower than that of the pedestal protrusion portion. The pedestal protrusion portion and the tip protrusion portion taper outward in the axial direction.