Joint-less Continuous Journal Bearing with Segmented Microstructures
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Solution Overview
Problem
Conventional journal bearings face challenges in achieving optimal performance due to the compromise of functionalities during coating design, requiring complex manufacturing processes and assembly steps, which limit their customization and efficiency.
Innovation Solution
A joint-less, continuous body journal bearing with at least three angular sectors is manufactured using additive manufacturing, allowing for varied microstructures and compositions in each sector to enhance specific functionalities such as load bearing, heat dissipation, and lubricant storage, eliminating the need for multiple parts and assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multilayered coatings are applied to steel backing to achieve multiple functionalities, then the journal bearing can provide lubrication, heat dissipation, and wear resistance, but the manufacturing process becomes complex and requires multiple assembly steps
Solution Approach 1:
The journal bearing is divided into multiple angular sectors (at least three), with each sector having distinct microstructure and composition optimized for specific functions. This segmentation allows different functionalities to be achieved in different zones without requiring complex multilayered coatings across the entire bearing surface.
Solution Approach 2:
Each angular sector is designed with locally optimized properties - for example, one sector may have high embeddability while another has high wear resistance. This local quality approach eliminates the need for universal multilayered coatings, simplifying the manufacturing process while maintaining functional versatility.
2Ease of manufacture
If split bearing design with two halves is used to facilitate assembly, then the bearing can be easily installed and removed, but the joint between halves creates potential weak points and requires precise alignment
Solution Approach 1:
The invention merges the bearing into a single continuous piece without joints or splits. This eliminates the reliability issues associated with joints between halves while maintaining ease of manufacture through additive manufacturing, which can produce complex monolithic structures in one piece.
Solution Approach 2:
The continuous body design serves multiple functions simultaneously - it provides structural integrity, facilitates additive manufacturing, and allows for integrated cooling channels or lubrication pathways throughout the bearing structure, eliminating the need for separate assembly components.
3Strength
If high strength materials like steel are used for the journal bearing body, then the bearing can support high loads, but the friction and wear resistance may be insufficient without additional coatings
Solution Approach 1:
The journal bearing uses composite materials with a steel backing providing structural strength and load-bearing capacity, while the angular sectors contain softer materials with high embeddability and wear resistance. This composite structure eliminates the need for additional coatings as the functional layers are integrated directly into the bearing body.
Solution Approach 2:
The bearing applies local quality by using hard steel in the backing for strength while incorporating softer, low-friction materials in the angular sectors that contact the shaft. This localized material selection reduces friction and wear at the contact surfaces while maintaining high load-bearing capacity through the steel structure.
Data Source
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AI summary
A journal bearing (120) for a shaft (110) is disclosed. The journal bearing (120) includes a joint-less, continuous body having an inner surface (122) defining a bore (124) to receive the shaft (110) and an outer surface (128). A cross-section (150) of the joint-less, continuous body perpendicular to a bore axis (126) includes at least three angular sectors (160, 170, 180). Each one of the at least three angular sectors (160, 170, 180) include at least one of a different microstructure or a different composition than each of neighboring angular sectors of the at least three angular sectors (160, 170, 180).