Resin Bushing Assembly with Embedded Rigid Powder
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Solution Overview
Problem
Vibration damping rubber bushings with resin outer cylinders face low dislodgement force and mispositioning risks when press-fit into metal mated components, despite prior attempts to enhance fastening through surface treatments and designs.
Innovation Solution
A method involving the deposition of a rigid powder, such as ceramic alumina powder, on the resin outer cylinder's outside peripheral face, which is then press-fit into the metal mated component, providing enhanced anchoring and dislodgement force through embedding into the component's surface, and optionally combined with a resin coating on the mated component's inside face via cationic electrodeposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the outer cylinder is made of resin to reduce weight, then weight is reduced, but the dislodgement force and fastening strength become insufficient
Solution Approach 1:
The invention uses a composite structure combining resin outer cylinder with metal spherical particles embedded in the rubber elastic body. The resin provides weight reduction while the metal particles provide enhanced fastening strength and dislodgement resistance, creating a composite material system that achieves both lightweight and high-strength requirements simultaneously.
Solution Approach 2:
The metal spherical particles act as an intermediary element between the resin outer cylinder and the mating component. These particles are embedded in the rubber elastic body and protrude toward the outer cylinder, providing a mechanical interlock that mediates the connection between the lightweight resin structure and the metal component, thereby enhancing fastening strength without compromising weight reduction.
2Ease of manufacture
If simple press fitting is used to assemble the resin outer cylinder, then assembly is simple, but the fastening force is low and mispositioning occurs
Solution Approach 1:
The metal spherical particles are pre-embedded in the rubber elastic body before the final assembly process. This preliminary action creates a prepared mechanical interlock structure that will engage with the mating component during press fitting, ensuring reliable fastening and preventing mispositioning while maintaining the simplicity of the assembly process.
Solution Approach 2:
The metal spherical particles are selectively distributed in specific regions of the rubber elastic body, particularly near the outer cylinder interface. This local concentration of reinforcement provides enhanced fastening reliability at the critical interface zone while maintaining the overall simplicity of the assembly process and not requiring complex modifications throughout the entire structure.
3Strength
If the outer cylinder is made of metal to ensure strong frictional fastening, then dislodgement resistance is high, but weight increases
Solution Approach 1:
Instead of making the entire outer cylinder from heavy metal, the invention uses metal spherical particles only in the regions where fastening strength is needed - embedded in the rubber elastic body near the interface with the mating component. This localized application of metal provides the necessary frictional fastening strength while keeping the overall weight low by using resin for the main cylinder structure.
Solution Approach 2:
The invention creates a composite system where resin forms the lightweight outer cylinder structure and metal spherical particles provide localized strength enhancement. This composite material approach allows the structure to achieve the necessary frictional fastening strength through the metal particles at the interface while maintaining overall weight reduction through the resin construction.
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
Significantly increases the dislodgement force and resistance to rotation of the vibration damping rubber bushing, ensuring secure fastening and maintaining the intended vibration damping function.
Implementation Method 1
a rigid powder composed of material harder than the outer cylinder is deposited in a section of the resin outer cylinder that is situated on the outside peripheral face and that mates with the inside peripheral face of the mated component
Implementation Method 2
optionally combined with a resin coating on the mated component's inside face via cationic electrodeposition
Data Source
AI summary
A method of manufacturing a bushing assembly that includes a vibration damping rubber bushing having a round cylindrical resin outer cylinder, which is assembled by press fitting an outside peripheral face of the outer cylinder in an axial direction into a cylindrical metal mated component having a circular inside peripheral face. The vibration damping rubber bushing is press fit into the mated component with a rigid powder composed of material harder than the outer cylinder deposited in a section of the resin outer cylinder that is situated on the outside peripheral face and that mates with the inside peripheral face of the mated component, and the outer cylinder and the mated component are assembled in a mated condition such that the rigid powder intervenes between the outside peripheral face of the outer cylinder and the inside peripheral face of the mated component.