Plain Bearing Composite Resisting Lateral Deflection
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Solution Overview
Problem
Existing plain bearing composite materials face challenges in maintaining fatigue strength at higher loads due to lateral deflection of the intermediate layer, leading to potential engine failure, and require complex production processes as the materials for the intermediate and bearing layers cannot be produced on the same casting system without significant effort.
Innovation Solution
A plain bearing composite material with a metallic support layer, an intermediate layer made of an aluminum alloy, and a bearing layer with the same components except for an additional soft phase portion, allowing both layers to be processed on the same casting system, using components like Ni, Mn, Cu, and optionally lead, tin, or bismuth as soft phases, and incorporating hard particles for enhanced strength and wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If an intermediate layer made of pure aluminum is used to improve bond between steel back and bearing material, then bond strength is improved, but lateral deflection occurs at loads above 80 MPa leading to axial distortion and potential engine failure
Solution Approach 1:
The patent changes the chemical composition parameters of the intermediate layer by adding specific alloying elements (Ni: 1-3%, Mn: 0.5-2.5%, Cu: 0.02-1.5%, and optionally Pb, Sn, or Bi) to pure aluminum. This parameter modification enhances both the bond strength to the steel back and the resistance to lateral deflection under high loads, eliminating the need to choose between bond strength and deflection resistance.
2Reliability
If different aluminum alloys are used for intermediate layer and bearing layer to optimize各自 performance, then material performance is improved, but production complexity increases requiring separate casting systems
Solution Approach 1:
The patent designs the intermediate layer alloy composition to serve multiple functions: it provides good bond strength to the steel back, offers resistance to lateral deflection under high loads, and maintains compatibility with the bearing layer alloy for production on the same casting system. The specific composition (Al with Ni: 1-3%, Mn: 0.5-2.5%, Cu: 0.02-1.5%, and optional soft phases) achieves this multi-functionality, allowing a single casting system to produce both layers with optimized performance.
3Strength
If intermediate layer thickness is increased to improve fatigue strength, then fatigue strength increases, but lateral deflection and axial distortion worsen
Solution Approach 1:
The patent changes the compositional parameters of the intermediate layer by adding specific alloying elements that enhance the material's structural stability and resistance to lateral deflection. This allows the intermediate layer to maintain adequate fatigue strength while resisting the axial distortion and lateral deflection that would otherwise occur with increased thickness, thereby optimizing both strength and shape stability.
Data Source
AI summary
The invention relates to an antifriction composite comprising a metal support layer, an intermediate layer produced from an aluminum alloy and a bearing layer produced from an aluminum alloy. The components of the aluminum alloys of the intermediate layer and the bearing layer are identical except for an additional soft phase portion in the bearing layer. Said soft phase portion may include lead, tin and/or bismuth. The invention also relates to a method for producing the inventive antifriction composite.