Stopper Member Retention in Vibration Damping Mounts
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Solution Overview
Problem
Conventional vibration damping devices face challenges in securely holding a separate stopper member within an accommodation recess without affecting the vibration damping performance, particularly due to the stopper member's contact with the inner circumferential surface, which hardens the spring properties and adversely impacts vibration isolation.
Innovation Solution
A vibration damping device design featuring a stopper member with lip-shaped parts that protrude from corner portions, allowing the lip-shaped parts to be positioned further inward than the retaining part, preventing the stopper member from falling out while minimizing its impact on spring properties by spacing the stopper member's facing side portions away from the inner circumferential surface, thus maintaining stable retention and controlled vibration damping performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the stopper member is held in the accommodation recess using an elastic tapered part and stopper protrusion, then the stopper member is securely retained, but the stopper member contacts the inner circumferential surface which hardens the spring properties and adversely affects vibration damping performance
Solution Approach 1:
The stopper member is designed with different local characteristics: the stopper protrusion at the corner provides retention function by engaging with the elastic tapered part, while the flat outer circumferential surface at the opposing side is specifically designed to face away from the inner circumferential surface of the accommodation recess, preventing contact and avoiding hardening of spring properties in the direction perpendicular to the axis
Solution Approach 2:
The stopper member employs an asymmetric design where one corner has a protruding stopper protrusion for engagement, while the opposite side has a recessed or flat surface that faces away from the accommodation recess wall. This asymmetric configuration ensures that the retention function is achieved at one location while the opposing side does not contact the inner circumferential surface, thus maintaining soft spring properties
2Stability of the object's composition
If the stopper member is designed to prevent falling out of the accommodation recess, then retention is achieved, but the stopper member may contact the inner circumferential surface and affect spring properties in the direction perpendicular to the axis
Solution Approach 1:
The stopper member is designed with different local characteristics: the stopper protrusion at the corner provides retention function by engaging with the elastic tapered part, while the flat outer circumferential surface at the opposing side is specifically designed to face away from the inner circumferential surface of the accommodation recess, preventing contact and avoiding hardening of spring properties
Solution Approach 2:
The design addresses the retention problem by utilizing the axial dimension (stopper protrusion engaging with elastic tapered part) rather than relying on radial contact. The flat outer circumferential surface is oriented in the axial direction to face away from the accommodation recess wall, thus achieving stability in the axial dimension without creating harmful contact in the radial dimension
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 design effectively prevents the stopper member from coming out of the accommodation recess and reduces its influence on spring properties, enabling stable handling and transportation while maintaining effective vibration damping performance, including soft spring properties in one direction and high load resistance in another.
Implementation Method 1
a first mounting member and a second mounting member are elastically connected to each other by a main rubber elastic body
Implementation Method 2
the lip-shaped part is located further inward than the retaining part in the accommodation recess, and the lip-shaped part overlaps the retaining part in axial projection
Data Source
AI summary
In a vibration damping device in which a separate stopper member is accommodated in an accommodation recess opening in an axial direction, a retaining part protruding toward an inner circumference is provided at an opening of the accommodation recess. The stopper member having a substantially quadrilateral outer shape is provided with lip-shaped parts protruding from the corner portions toward the outer circumference, and the lip-shaped part is located in the accommodation recess further inward than the retaining part and overlaps the retaining part in the axial projection. A rod insertion hole is formed through the stopper member in the axial direction, and a pair of facing side portions on an outer circumferential surface of the stopper member are spaced apart from an inner circumferential surface of the accommodation recess to an inner circumference in a region extending to both outer sides of the rod insertion hole between the lip-shaped parts.