Engine Mount Stopper Structure to Suppress Spring Constant Rise
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Solution Overview
Problem
Conventional anti-vibration devices experience a sudden increase in spring constant after contact, leading to adverse effects on ride comfort when used as engine mounts due to the integral stopper portion being supported by a second attachment member.
Innovation Solution
The anti-vibration device features a stopper supported by an elastic member, with the inner member having a through portion, allowing the stopper to be supported by the elastic member, thereby suppressing the increase in spring constant after contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the stopper portion is formed integrally with the elastic member and supported by the second attachment member, then the stopper can restrict relative movement between members, but the spring constant increases immediately after contact with the bracket
Solution Approach 1:
The stopper is separated from the second attachment member and supported only by the elastic member. This segmentation allows the stopper to function independently with the original spring constant of the elastic member, preventing the sudden increase in spring constant that occurs when the stopper is integrated with and supported by the rigid second attachment member.
2Ease of operation
If the stopper portion is formed integrally with the elastic member, then soft spring properties can be achieved when in contact with the bracket, but the actual spring properties become stiff immediately after contact
Solution Approach 1:
The stopper is extracted from the support structure of the second attachment member and repositioned to be supported solely by the elastic member. This extraction ensures that the stopper maintains the soft spring properties of the elastic member throughout its operation, eliminating the sudden stiffening that occurs when supported by the rigid second attachment member.
3Strength
If the stopper is supported by the elastic member through a through portion in the inner member, then the spring constant increase is suppressed, but the structure becomes more complex
Solution Approach 1:
The stopper is positioned within the through portion of the inner member, creating a nested configuration where the stopper resides inside the inner member's through portion while being supported by the elastic member. This nesting approach achieves the desired spring constant control while utilizing the existing inner member structure, thereby minimizing additional complexity.
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 restricts excessive displacement between outer and inner members while maintaining consistent spring properties, improving ride comfort and durability by supporting the stopper with an elastic member.
Implementation Method 1
an elastic member (4) linking the outer member (2) and the inner member (3) and disposed inside the outer member (2)
Implementation Method 2
a stopper (5) that restricts relative movement between the outer member (2) and the inner member (3) by contact with the outer member (2)
Data Source
Figure 1
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Figure 3
AI summary
An anti-vibration device (1) includes an outer member (2) connected to one of a vibration-generating side or a vibration-receiving side, an inner member (3) connected to the other of the vibration-generating side or the vibration-receiving side, and an elastic member (4) linking the outer member (2) and the inner member (3) and disposed inside the outer member (2). A stopper (5) restricts relative movement between the outer member (2) and the inner member (3) by contact with the outer member (2). The stopper (5) is supported by the elastic member (4).