Piston Crosshatch Groove Angle for Oil Retention
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Solution Overview
Problem
Existing pistons for internal combustion engines face issues with lubricant oil discharge due to streaks inclined in one direction, leading to insufficient oil retention and compromised seizure resistance.
Innovation Solution
A piston design featuring a crosshatched groove on the piston surface with a crosshatch angle between 15 to 35 degrees, formed using laser processing, which retains lubricant oil effectively and maintains seizure resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If plural streaks are inclined and extend in only one direction with respect to the sliding direction, then the cutting or form rolling process is simplified, but the lubricant oil is easily discharged from the groove edge and oil retaining performance cannot be sufficiently ensured
Solution Approach 1:
The invention transitions from unidirectional streaks to crosshatched grooves that extend in multiple directions (first and second directions intersecting at a specific angle). This dimensional change creates a network pattern that effectively traps lubricant oil, preventing its discharge during piston reciprocating motion while maintaining manufacturing feasibility through controlled groove formation processes
2Reliability
If crosshatched grooves are formed with a crosshatch angle between 15 to 35 degrees, then oil retention performance is significantly improved, but the groove formation process becomes more complex
Solution Approach 1:
The invention specifies a particular crosshatch angle parameter range (15 to 35 degrees) between the first and second directions of the grooves. This parameter optimization ensures effective oil retention by creating appropriate groove intersection angles that trap lubricant, while the angle range is selected to balance performance with manufacturability using conventional groove formation techniques
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 crosshatched groove design ensures prolonged oil retention and secure seizure resistance by preventing oil discharge during reciprocating motion, while simplifying the manufacturing process and maintaining surface smoothness.
Implementation Method 1
a forming process forming a crosshatched groove on a surface of a piston main body for the internal combustion engine by a laser processing
Data Source
AI summary
A piston for an internal combustion engine includes a piston main body for the internal combustion engine, and a crosshatched groove being formed on a surface of the piston main body. The crosshatched groove includes a crosshatch angle that corresponds to a crossing angle of lines that configure a crosshatch, the crosshatch angle that is set at a range from equal to or greater than 15 degrees to equal to or less than 35 degrees.