Sliding Bearing Axial Width Optimization for Friction Reduction
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Solution Overview
Problem
Conventional sliding bearings for engines have uniform axial width, leading to excessive frictional resistance and reduced fuel efficiency due to larger widths at peripheral ends and central parts, which are not subjected to high loads, while manufacturing methods struggle to adjust widths accordingly.
Innovation Solution
A sliding bearing design where the axial width is smaller at peripheral ends and central parts, and larger at the quarter part, achieved by cutting the end surfaces before deforming flat-plate materials into semicircular half bearings, allowing for a non-uniform axial width distribution that matches load application points, and a manufacturing method that finishes axial end surfaces before shaping, reducing post-shaping processing needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the axial width of half bearings is made uniform throughout, then the bearing can support maximum load at critical positions, but frictional resistance increases excessively at non-load-bearing areas
Solution Approach 1:
The patent applies local quality by varying the axial width of the half bearing according to the load distribution pattern. The bearing width is increased at positions subjected to large loads (quarter parts) and decreased at positions with smaller loads (peripheral ends and central part), creating a non-uniform width profile that optimizes both load-bearing capacity and frictional resistance
Solution Approach 2:
The patent introduces dynamic adaptability by making the bearing width variable rather than fixed, allowing the bearing structure to match the dynamic load distribution that occurs during engine operation differentials
2Ease of manufacture
If cutting processing is performed after deforming flat-plate material into semicircular shape, then the manufacturing process follows conventional sequence, but it is difficult to achieve non-uniform width distribution
Solution Approach 1:
The patent applies preliminary action by performing cutting processing on the flat-plate material before deforming it into a semicircular shape. This sequence allows the material to be cut into sections of different widths while still in the flat state, and then these sections are deformed and assembled to form the non-uniform width bearing structure
Solution Approach 2:
The patent applies segmentation by dividing the flat-plate material into multiple sections along the axial direction before deformation. Each section can have a different width, and these segmented portions are then deformed and joined to create the final non-uniform width bearing configuration
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 reduces sliding resistance at non-load-bearing areas, improves fuel efficiency, and enhances manufacturing cost-effectiveness by eliminating the need for additional finishing steps, resulting in a sliding bearing with optimized axial width distribution and improved fatigue resistance.
Implementation Method 1
a flat-plate material is deformed semicircular by press shaping
Implementation Method 2
end surfaces of both axial ends and both peripheral ends of the semicircular material are cut
Data Source
AI summary
This sliding bearing comprises a pair of semicircular half bearings formed into a cylindrical shape by bringing both circumferential ends thereof into contact with each other. The axial width of the half bearings is narrower in both circumferential ends and the circumferential center, and wider in the quarter parts located therebetween. During manufacturing of the half bearings, finishing by cutting processing is first performed on the parts of a flat-plate material which after formation are to become the two axial-direction end faces and the two circumferential-direction end faces of the half bearings, and thereafter, the flat-plate material is deformed into a semicircle.