Plastic Oil Pan Vibration Surface Noise Control
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Solution Overview
Problem
Existing oil pans for internal combustion engines do not effectively manage noise emissions, leading to undesirable noise characteristics that affect customer acceptance, and current solutions either increase production costs or are complex to implement.
Innovation Solution
The oil pan design incorporates a vibration-influenced surface with reduced rigidity and elasticity compared to the lateral surface, strategically positioned and surrounded by the stiffer lateral surface, allowing targeted sound emission control by directing noise to desired frequency ranges, thereby enhancing psychoacoustic parameters and reducing noise emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the oil pan is made of plastic or composite material to reduce weight, then weight is reduced, but noise emissions increase
Solution Approach 1:
The oil pan is made of plastic or composite material that combines lightweight properties with sound-damping characteristics. The composite material structure allows the pan to maintain low weight while inherently reducing noise emissions through the material's damping properties, eliminating the need for additional sound-damping layers.
Solution Approach 2:
The patent modifies the wall thickness and structural parameters of the oil pan to optimize the balance between weight and noise reduction. By carefully controlling the thickness and geometry of the plastic or composite material, the design achieves sufficient structural integrity and sound damping while maintaining lightweight characteristics.
2Object-generated harmful factors
If additional sound-damping layers and barrier layers are added to the oil pan, then noise emissions are reduced, but production costs and device complexity increase
Solution Approach 1:
The sound-damping function is integrated directly into the oil pan wall structure itself, merging the structural and acoustic functions into a single component. This eliminates the need for separate sound-damping layers and barrier layers, simplifying the overall structure while maintaining noise reduction effectiveness.
Solution Approach 2:
The oil pan structure is designed to provide its own sound-damping properties through its inherent material characteristics and geometric design. The pan serves its primary containment function while simultaneously providing noise reduction, eliminating the need for additional dedicated sound-damping components.
3Object-generated harmful factors
If the oil pan structure is reinforced to shift natural frequencies to higher frequencies, then noise characteristics are improved, but manufacturing complexity increases
Solution Approach 1:
The oil pan incorporates curved and rounded structural features rather than sharp angles and flat surfaces. These curved geometries naturally distribute stress and influence vibration modes, helping to shift natural frequencies to higher ranges while maintaining manufacturability through standard molding processes.
Solution Approach 2:
The oil pan structure is divided into multiple zones with different wall thicknesses and structural characteristics. This segmentation allows optimization of vibration properties in different areas without requiring complex reinforcement throughout the entire structure, maintaining ease of manufacture through modular design.
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 design effectively reduces noise emissions by directing sound to desired frequency ranges, improving the perceived load condition of the engine and enhancing customer acceptance while maintaining low production costs and simplicity in manufacturing.
Implementation Method 1
The vibration-influenced surface has a lower rigidity and/or elasticity compared to the lateral surface, so that a different sound radiation property results
Data Source
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AI summary
Oil pan (1) for an internal combustion engine, which is designed in a pan shape, comprising a bottom area (2) and surrounding side surfaces (3, 3', 3', 3''') which can be connected at its free end to an internal combustion engine via a flange area (4), wherein the oil pan (1) is made at least partially of plastic and/or a composite material, wherein at least one side surface (3, 3', 3', 3'') is provided with at least one influence area (5) which comprises a cylindrical surface (6) and a vibration influence surface (7) adjoining the cylindrical surface (6), wherein the vibration influence surface (7) is arranged at least partially spaced from the principal extension plane (8) of the side surface (3, 3', 3', 3''') associated with the influence area (5), and the vibration influence surface (7) has a different elasticity and/or stiffness compared to the cylindrical surface (6), such that a different This results in sound radiation properties.