Expansion Tank Plastic Collar Snap-Fit Insert
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Solution Overview
Problem
The existing expansion tanks for motor-vehicle cooling systems face issues with plastic collar deterioration due to vibrations and exposure to high temperatures, leading to micro-fractures and localized ruptures, despite the use of metallic bushings for reinforcement.
Innovation Solution
An expansion tank design featuring a plastic insert with a snap-coupling mechanism, made from a high-temperature-resistant plastic material with elastically deformable teeth, which provides internal stiffening and heat shielding without the risk of axial slippage, replacing traditional metallic bushings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metallic bushing is inserted in the plastic collar by cold driving process, then the plastic collar is shielded from heat and mechanical stresses are supported, but the bushing slips outwards over time due to vibrations, causing the innermost portion of the collar to deteriorate
Solution Approach 1:
The metallic bushing is segmented into multiple axial sections that can independently deform. The intermediate section acts as a buffer that absorbs vibrational stresses through elastic deformation, preventing the bushing from slipping outwards as a rigid unit while maintaining its protective function.
Solution Approach 2:
The bushing transitions from a rigid structure to a dynamic one with flexible intermediate sections. This allows the bushing to adapt to vibrational movements by deforming elastically, maintaining stable engagement with the plastic collar while continuing to provide thermal and mechanical protection.
2Strength
If a metallic bushing is used to reinforce the plastic collar, then mechanical stresses are supported, but the innermost portion of the collar lacks reinforcement when the bushing slips, leading to micro-fractures and ruptures
Solution Approach 1:
The bushing is divided into multiple sections with the intermediate section designed to deform under stress. This segmentation ensures that the reinforcement function is maintained across the entire bushing length, preventing any single section from failing and causing loss of structural integrity.
Solution Approach 2:
The flexible intermediate section of the bushing acts as a cushion that absorbs and dissipates vibrational energies before they can cause damage to the plastic collar. This beforehand cushioning prevents the transmission of harmful stresses that would lead to micro-fractures and ruptures.
3Object-affected harmful factors
If a metallic bushing is inserted to provide thermal protection, then heat shielding is improved, but the bushing slips outward over time, exposing the plastic collar to high temperatures and accelerating deterioration
Solution Approach 1:
The bushing's flexible intermediate section allows the structure to dynamically respond to thermal expansion and contraction without losing positional stability. This dynamic capability ensures continuous thermal protection while accommodating temperature-induced dimensional changes.
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 solution effectively prevents axial slippage and deterioration of the plastic collar, maintaining structural integrity and reducing thermal stress, while allowing for easy assembly and visual identification markers.
Implementation Method 1
reducing heat conduction
Implementation Method 2
elastically deformable teeth
Data Source
AI summary
An expansion tank for a motor-vehicle cooling system has an inlet port and an outlet port and is provided with a plastic shell having a container and two protruding collars, respectively at the two ports; at least one of the collars defines a seat, which is engaged by a tubular insert coaxial to the collar; elastically deformable teeth are provided for snap-coupling the tubular insert and the shell to each other and axially retaining the tubular insert in the seat.