Slit Plastic Outer Pipe Mount for Durable Press-Fit Assembly
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Solution Overview
Problem
Manufacturing a power electronic module mount using a plastic outer pipe results in durability issues due to the inability to pre-apply compressive residual stress, leading to breakage and reduced durability of the main rubber component.
Innovation Solution
The mount design includes an outer pipe made of plastic with a slit structure and catch protrusions, allowing for a press-fit assembly that prevents bending or folding during swaging, and features matching portions to ensure proper alignment and fixation to a bracket.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the outer pipe is made of plastic material, then weight and cost are reduced and corrosion resistance is improved, but durability performance deteriorates due to inability to pre-apply compressive residual stress
Solution Approach 1:
The slit is formed in the outer pipe before the press-fit assembly process. This preliminary structural modification allows the plastic outer pipe to deform and apply compressive residual stress to the main rubber component during assembly, without requiring high-temperature processing or complex swaging operations that would cause breakage.
Solution Approach 2:
The outer pipe transitions from a closed circular cross-section to an open slit structure during assembly. This parameter change in geometry enables the plastic material to deform elastically and generate the necessary compressive residual stress on the rubber component while avoiding the breakage issues associated with traditional swaging of closed-section plastic pipes.
2Ease of manufacture
If the outer pipe is made of plastic material, then cost is reduced, but manufacturing precision deteriorates due to breakage during swaging
Solution Approach 1:
The slit is pre-formed in the outer pipe before assembly, enabling controlled deformation during press-fit without the need for high-precision swaging operations. This eliminates the risk of breakage during manufacturing while maintaining adequate dimensional accuracy for functional performance.
3Object-affected harmful factors
If the outer pipe is made of plastic material, then corrosion resistance is improved, but strength deteriorates due to breakage during swaging
Solution Approach 1:
The slit structure is prepared in advance, allowing the plastic outer pipe to achieve the necessary deformation and strength characteristics during assembly without subjecting it to the high-stress swaging process that causes breakage. The slit enables controlled elastic deformation that develops compressive residual stress while maintaining structural integrity.
Data Source
AI summary
Disclosed is a mount for a vehicle, wherein the mount includes: an outer pipe made of a plastic material and having a slit having one end and another end facing and spaced apart from each other in a circumferential direction of the outer pipe; an inner pipe coaxially arranged with, and disposed within, the outer pipe; a main rubber component coupled to the inner pipe and mounted on an inner circumferential surface of the outer pipe; and a bracket having formed therein a press-fit hole into which the outer pipe is configured to be press-fitted when the one end and the other end of the slit are joined to each other.