Cylindrical Mount Cup Structure for Two-Stage Axial Load Damping
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Solution Overview
Problem
Conventional cylindrical mounts face challenges in durability under large axial loads and require tunable vibration damping properties, as they experience tensile stress and limited initial spring elasticity, necessitating improved design for load separation and approaching scenarios.
Innovation Solution
The cylindrical mount design features a cup member with a non-bonded bottom wall and a circumferential wall that expands outward, incorporating a deformation regulation part with a gap, allowing for two-stage spring properties and enhanced durability through a stopper effect, and adjustable step differences for tuning initial spring elasticity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the first installation member and second installation member are bonded to the main rubber elastic body, then the structural strength is improved, but tensile stress concentration occurs under large axial loads reducing durability
Solution Approach 1:
The patent extracts the bonding interface between the first installation member and the main rubber elastic body, replacing it with a press-fit configuration. The first installation member is inserted into the cup member without bonding, allowing relative movement and reducing tensile stress concentration on the rubber elastic body while maintaining structural integrity through friction and geometric interference.
Solution Approach 2:
The cup member acts as an intermediary between the first installation member and the main rubber elastic body. It provides a press-fit connection that mediates the load transfer, reducing direct tensile stress on the rubber elastic body while maintaining structural strength through the intermediate mechanical interface.
2Stability of the object's composition
If the circumferential wall is rigidly connected to the main rubber elastic body, then structural stability is improved, but vibration damping properties cannot be tuned for different load conditions
Solution Approach 1:
The patent makes the connection between the circumferential wall and the main rubber elastic body dynamic rather than rigid. The press-fit configuration allows the circumferential wall to move relative to the rubber elastic body under different load conditions, enabling the system to adapt its stiffness characteristics. This provides low spring elasticity at initial stages and high dynamic spring elasticity when large loads are input, achieving tunable vibration damping properties.
3Strength
If bonding is used between the cup member and main rubber elastic body, then connection strength is improved, but durability under separation load is reduced due to stress concentration
Solution Approach 1:
The patent removes the bonding connection between the cup member and the main rubber elastic body, replacing it with a press-fit mechanical connection. This extraction of the bonding interface eliminates the stress concentration that would occur at the bonded joint under separation loads, improving durability while maintaining sufficient connection strength through friction and geometric interference.
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 enhances durability under tensile loads and facilitates tunable vibration damping properties by providing low initial spring elasticity and high spring elasticity at later stages, effectively managing load inputs and preventing noise.
Implementation Method 1
a main rubber elastic body, in a cylindrical shape, and connecting the inner member and the outer cylindrical member
Data Source
AI summary
In a cylindrical mount in which an inner member and an outer cylindrical member are connected by a main rubber elastic body in a cylindrical shape, the inner member includes a cup member open toward the main rubber elastic body, an end of the main rubber elastic body in an axial direction is inserted and installed to the cup member, a bottom wall of the cup member is superimposed to an end surface of the main rubber elastic body in the axial direction without being bonded, and a circumferential wall of the cup member expands toward an opening side, and, at least in an opening portion, is arranged as a deformation regulation part which has a gap in a state of being separated with respect to the main rubber elastic body toward an outer circumference to be externally inserted.