Sliding Bearing Washer Locking Structure Against Detachment
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Solution Overview
Problem
In internal combustion engines, the attachment method for washers on half bearings can result in varying calking forces and positions, leading to a risk of washer detachment before assembly in the cylinder block.
Innovation Solution
A sliding bearing design featuring half bearings with specific concave and convex portions on the washer and bearing surfaces, respectively, that engage without calking traces, ensuring secure attachment and preventing detachment under axial loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If calking is used to attach the washer to the half bearing, then the washer can be fixed, but the calking force and position vary from workpiece to workpiece, leading to a risk of washer detachment
Solution Approach 1:
The single calking operation is segmented into multiple calking points (first calking point and second calking point) distributed around the circumference. This segmentation ensures that the attachment force is distributed evenly and prevents localized stress concentration, thereby improving both attachment strength and reliability while reducing variability between workpieces
Solution Approach 2:
Different regions of the washer are given different functions: the first and second convex portions (local regions) are designed for engagement with concave portions to prevent detachment, while the third convex portion is designed for oil supply. This local differentiation optimizes both attachment reliability and lubrication function
2Ease of manufacture
If calking is applied to fix the convex portion, then the washer is attached, but the force at which calking is applied varies depending on the position of the workpiece
Solution Approach 1:
The concave portions are pre-formed in the half bearing at specific positions before the calking process. These pre-formed concave portions guide the convex portions of the washer into correct alignment, ensuring precise positioning before calking is applied. This preliminary preparation eliminates the need for complex positioning during calking, improving both manufacturing precision and ease of manufacture
Solution Approach 2:
The geometric configuration of the convex and concave portions creates a self-aligning mechanism. The convex portions naturally fit into the corresponding concave portions during assembly, and the calking force automatically applies at the correct positions without requiring external positioning devices or complex fixtures, thereby improving manufacturing precision while maintaining ease of manufacture
Data Source
AI summary
A half bearing has a concave portion, a concave portion, and a concave portion penetrating from the outer circumferential surface to the inner circumferential surface, and the washer has a convex portion, a convex portion, and a convex portion on the inner circumferential surface side. The washer is moved to the outer circumferential surface side of the half bearing in a bent state, the convex portion is inserted into the concave portion, the convex portion is aligned with the position of the concave portion, and the convex portion is aligned with the position of the convex portion. Next, when the half bearing returns to its shape before being bent, the convex portion is accommodated in the concave portion, and the convex portion is also accommodated in the concave portion. Even if an axial force acts on the sliding bearing, the protrusion, the protrusion, and the protrusion engages with the concave portion, the concave portion, and the concave portion, so that the washer and the washer are not detached from the half bearing.