Multi-Radii Fillet Snap Channel for Cylinder Block Fatigue
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Solution Overview
Problem
Engine cylinder blocks with snap channels often experience fatigue, particularly in areas of high stress, which can lead to reduced durability and performance.
Innovation Solution
The implementation of multi-radii fillet profiles in snap channels, where high-stress areas have larger radii and low-stress areas have smaller radii, along with the use of bearing caps and specific cavity designs, to enhance structural integrity and fatigue resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a snap channel is formed in the engine cylinder block, then the bearing cap can be attached to the block, but the area of the snap channel experiences fatigue and reduced durability
Solution Approach 1:
The patent applies different fillet radii at different locations within the snap channel. Specifically, a first fillet radius is used at the first end of the snap channel, and a second fillet radius is used at the second end, where the first fillet radius is greater than the second fillet radius. This local variation in geometry optimizes stress distribution at each location, addressing the fatigue issue while maintaining the snap channel's function for bearing cap attachment.
2Ease of manufacture
If a snap channel with uniform fillet radius is used, then the manufacturing process is simple, but stress concentration occurs leading to fatigue
Solution Approach 1:
The patent implements a multi-radii fillet profile where different sections of the snap channel have different fillet radii. The first fillet radius at the first end is greater than the second fillet radius at the second end. This creates localized stress distribution optimization without requiring complex manufacturing processes, as each fillet can still be created using standard machining operations.
Solution Approach 2:
The patent changes the geometric parameter (fillet radius) at different locations along the snap channel. By varying the fillet radius from a first value at one end to a second value at the other end, the patent optimizes the stress distribution pattern to reduce fatigue while maintaining manufacturability through controlled parameter variation.
Data Source
AI summary
A number of variations which may include a product including a combustion engine cylinder block having a first snap channel having first multi-radii fillet profile, and methods of making the same.