Vibration-Damping Device Non-Adhesive Stopper Positioning
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Solution Overview
Problem
Conventional vibration-damping devices for automotive engine mounts face challenges in precisely positioning stopper rubbers without adhesive bonding, which can lead to movement and reduced durability.
Innovation Solution
A vibration-damping device design featuring a stopper rubber with an elastic contact part that is pressed against the outer peripheral face of the first attachment member from the distal end side of the inner bracket, allowing for non-adhesive positioning and stabilization of the stopper rubber relative to the inner bracket, utilizing a through hole and elastic contact part for secure attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the stopper rubber is attached in a non-adhesive way to cover the inner bracket, then the manufacturing process is simplified, but the positioning precision deteriorates causing movement of the stopper rubber
Solution Approach 1:
The stopper rubber is divided into multiple functional parts: a bag-shaped body for covering the inner bracket, and a separate elastic contact part for positioning. This segmentation allows the rubber to be attached in a non-adhesive way while maintaining positioning precision through the elastic contact part that engages with the first attachment member.
Solution Approach 2:
The elastic contact part acts as an intermediary between the stopper rubber and the first attachment member. It provides a mechanical engagement point that ensures precise positioning without requiring adhesive bonding, thus resolving the contradiction between simplified manufacturing and positioning precision.
2Device complexity
If the stopper rubber is positioned precisely without bonding, then the manufacturing complexity is reduced, but the reliability deteriorates due to potential movement under stopper load
Solution Approach 1:
The elastic contact part is designed to be deformable, allowing it to dynamically adapt to the first attachment member while maintaining secure contact. This dynamic characteristic ensures reliable positioning under stopper load without requiring bonding, as the elastic deformation provides continuous contact pressure.
Solution Approach 2:
The elasticity parameter of the contact part is specifically optimized to provide sufficient contact force for reliable positioning. By changing the material parameter (elasticity) rather than using adhesive bonding, the invention achieves both reduced manufacturing complexity and maintained reliability.
3Productivity
If the stopper rubber is mounted to cover the inner bracket without adhesive, then the production time is reduced, but the durability worsens due to relative movement under load
Solution Approach 1:
By segmenting the stopper rubber into a mountable body and a positioning contact part, the invention enables quick non-adhesive attachment while ensuring durability through the dedicated elastic contact part that prevents relative movement under operational loads.
Solution Approach 2:
The elastic contact part provides self-service positioning by automatically engaging with the first attachment member through elastic deformation. This self-positioning mechanism eliminates the need for adhesive bonding during assembly (improving productivity) while maintaining durability through continuous elastic contact that prevents movement under load.
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 positions the stopper rubber without the need for special positioning work like bonding, enhancing the target stopper characteristics and durability by ensuring stable contact and reduced reaction forces.
Implementation Method 1
an elastic contact part provided at a rim of the through hole in the stopper rubber, the elastic contact part being pressed against an outer peripheral face of the first attachment member from a distal end side of the inner bracket
Data Source
AI summary
A vibration-damping device comprising: first and second attachment members connected elastically by a main rubber elastic body; an inner bracket fixed to the first attachment member with its basal end superposed on an outside end face of the first attachment member while extending laterally relative to the first attachment member; a bag-shaped stopper rubber mounted covering the basal end of the inner bracket in a non-adhesive way; a through hole formed in the stopper rubber so that the first attachment member inserted through it and the inner bracket are mutually fixed; and an elastic contact part provided at a rim of the through hole and pressed against an outer peripheral face of the first attachment member from a distal end side of the inner bracket so that the stopper rubber is positioned relative to the inner bracket in extension direction of the inner bracket.