Plastic Oil Pan Heat Resistance via Segmented Cooling
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Solution Overview
Problem
Oil pans made of plastic materials, such as polyamide, fail when exposed to high heat due to a lack of cooling, leading to melting and potential engine oil leakage, which can accelerate fires.
Innovation Solution
An oil pan design with an oil cooling area adjacent to the lateral outer wall, where the cooling level is decoupled from the storage level, allowing the oil to dissipate heat and maintain the structural integrity of the outer wall by keeping it at or below the oil temperature, using a partition and potentially a bimetallic element for temperature-controlled oil passage management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If oil pan is made of plastic material to reduce weight and cost, then weight and manufacturing cost are reduced, but heat and flame resistance deteriorate
Solution Approach 1:
The interior of the oil pan is divided into two separate areas: an oil storage area and an oil cooling area. This segmentation allows the oil cooling area to be positioned adjacent to the lateral outer wall, enabling direct heat dissipation to the wall and improving the overall heat resistance of the plastic oil pan without changing the material itself.
Solution Approach 2:
Oil serves as an intermediary cooling medium between the heat source (engine components) and the lateral outer wall. By creating a dedicated oil cooling area adjacent to the wall, the oil directly absorbs heat from the wall, preventing the plastic material from reaching its melting point under fire conditions.
2Reliability
If oil cooling area is created adjacent to lateral outer wall, then heat and flame resistance is improved, but device complexity increases
Solution Approach 1:
The partition wall separating the oil storage area and oil cooling area is merged with the base body of the oil pan as a single integrated component. This merging eliminates the need for separate assembly steps and additional sealing elements, reducing manufacturing complexity while maintaining the functional benefits of the two-area design.
3Manufacturing precision
If partition wall is made oil-impermeable to decouple oil levels, then cooling level control is improved, but manufacturing precision requirements increase
Solution Approach 1:
The partition wall is integrated into the base body as a single molded piece, eliminating the need for separate assembly and sealing operations. This integration ensures oil-impermeability through the molding process itself, achieving precise oil level decoupling without requiring post-manufacturing sealing or complex assembly procedures.
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 significantly enhances heat and flame resistance, preventing the outer wall from collapsing or breaking and reducing the risk of oil leakage and fire acceleration.
Implementation Method 1
When the oil pan is exposed to intense heat or flames, the outer side wall, in the areas where it is in contact with the oil in the oil cooling section, can transfer heat to the oil, thus providing a cooling effect.
Data Source
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AI summary
In order to provide an oil pan, comprising a bottom wall and a lateral outer wall which, in the mounted state of the oil pan in the direction of gravity, extends upwards from the bottom wall, and an oil storage region which is arranged in an interior of the oil pan and is filled with oil to a storage level during operation of the oil pan, which oil pan has improved heat and flame resistance, it is proposed that the oil pan comprises an oil-cooling region which is adjacent to the lateral outer wall and is filled with oil up to a cooling level, and a decoupling device for decoupling the cooling level of the oil in the oil-cooling region from the storage level of the oil in the oil storage region in a cooling state of the oil pan.