Half Bearing Groove Angle for Oil Leakage Control
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Solution Overview
Problem
Existing half bearings with grooves on the inner circumferential surface face challenges in maintaining load capacity due to lubricating oil leakage, as previous designs have not optimally positioned grooves to prevent capacity reduction.
Innovation Solution
A half bearing design featuring grooves on the inner circumferential surface with specific inclination angles (90°≤θ≤105°) and additional features like crush reliefs and recessed portions to manage lubricating oil effectively, preventing load capacity decrease.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If a groove is formed on the inner circumferential surface of the half bearing, then lubricating oil leakage is suppressed, but load capacity decreases
Solution Approach 1:
The groove is positioned at a specific location on the inner circumferential surface (at an angle of 90°≤θ≤105° from the mating surface end) rather than uniformly distributed, creating local oil control zones where needed while preserving load-bearing areas. This localized approach suppresses oil leakage at critical positions without compromising overall load capacity.
Solution Approach 2:
The groove's angular position parameter (θ) is optimized within the range of 90°≤θ≤105° measured from the end of the mating surface. By changing this positional parameter, the invention achieves optimal balance between oil leakage suppression and load capacity maintenance, as this specific angular range prevents air bubble generation while preserving sufficient bearing area.
2Reliability
If the groove is positioned to suppress oil leakage, then lubrication is improved, but load capacity decreases due to reduced bearing area
Solution Approach 1:
The groove is strategically positioned at angle θ (90°≤θ≤105°) to create localized oil retention zones exactly where lubrication is most needed, while leaving the majority of the inner circumferential surface intact for load bearing. This selective localization improves lubrication effectiveness without significantly reducing the load-bearing area.
Solution Approach 2:
The groove is positioned upstream (at angle θ from the mating surface end) to preliminarily control oil distribution before the oil reaches critical leakage points. This preliminary oil management ensures proper lubrication film formation while maintaining load capacity, as the groove prepares the oil flow rather than merely reacting to leakage.
3Quantity of substance
If the groove extends fully in the circumferential direction, then oil distribution is improved, but manufacturing complexity increases
Solution Approach 1:
Rather than forming a continuous circumferential groove, the invention uses a segmented approach with a groove positioned at a specific angular range (90°≤θ≤105°). This segmentation reduces manufacturing complexity compared to full circumferential grooves, while still achieving effective oil distribution in the critical regions where oil leakage occurs.
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 effectively suppresses lubricating oil leakage, maintaining the load capacity by optimizing groove positioning and structure to manage oil film thickness and prevent air bubble generation, ensuring efficient lubrication and reduced wear.
Implementation Method 1
lubricating oil is supplied to a gap between a shaft and the bearings, an oil film is formed and the shaft moves away from the bearings as a result of the shaft rotating, and the shaft is supported by the oil film so as to rotate
Data Source
AI summary
A half bearing includes: a semi-cylindrical bearing body having an inner circumferential surface that slides against a counterpart shaft; and a first groove formed in the inner circumferential surface so as to extend in a circumferential direction of the inner circumferential surface. In a cross section that is parallel with the circumferential direction and passes through the first groove, of the bearing body, an angle θ satisfies 90°≤θ≤105°, where the angle θ is formed by: a line connecting the inner circumferential surface side end of a mating surface located on a downstream side in a rotational direction of the counterpart shaft with the center point of a circular arc constituting an outer circumferential surface; and a line connecting an end of the first groove in the circumferential direction, on the upstream side in the rotational direction of the counterpart shaft, with the center point.