Monolithic Piston Assembly Ribs Structural Support
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Solution Overview
Problem
Piston assemblies in two-cycle engines face challenges due to the need for separate reinforcement components made of steel, which increase weight, complexity, and manufacturing costs, while existing designs fail to effectively manage extreme thrust and anti-thrust forces without additional structural support.
Innovation Solution
A piston assembly with a monolithic structure featuring a crown, pin bosses, and a separate skirt, where ribs and laterally extending webs provide structural support, eliminating the need for additional reinforcement components and allowing for a single-piece construction from materials like steel or aluminum, enhancing structural integrity without increasing weight or complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If separate reinforcement components made of steel are attached to the piston, then structural strength is improved, but weight and device complexity increase
Solution Approach 1:
The patent merges the reinforcement function into the piston crown by integrating ribs and laterally extending webs directly into the monolithic piston structure. These structural features extend from the pin bosses to provide reinforcement without requiring separate attached components, thereby maintaining strength while reducing complexity.
Solution Approach 2:
The piston crown is segmented into functional regions including ribs and laterally extending webs that are integrated into the monolithic structure. This segmentation provides localized reinforcement where needed while maintaining overall structural integrity without adding separate components.
2Strength
If separate reinforcement components made of steel are attached to the piston, then structural strength is improved, but manufacturing cost increases
Solution Approach 1:
The reinforcement features are merged into the piston crown as an integrated monolithic structure, eliminating the need for separate manufacturing and assembly processes for reinforcement components. This reduces manufacturing steps, labor costs, and overall production complexity.
Solution Approach 2:
The monolithic piston structure serves multiple functions simultaneously: the crown provides combustion containment, the pin bosses provide wrist pin support, and the integrated ribs and webs provide structural reinforcement. This multi-functionality eliminates the need for separate reinforcement components.
3Device complexity
If a monolithic piston structure is used, then manufacturing complexity is reduced, but structural support against extreme forces must be integrated
Solution Approach 1:
The monolithic piston crown is segmented into functional regions including ribs and laterally extending webs that are formed as integral parts of the single-piece structure. This segmentation provides localized structural support against extreme thrust and anti-thrust forces while maintaining manufacturing simplicity through a single-piece construction.
Solution Approach 2:
The piston crown features local structural enhancements in the form of ribs and laterally extending webs positioned specifically where extreme forces are experienced. These localized features provide targeted structural support without compromising the overall monolithic construction or requiring additional components.
Data Source
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AI summary
A piston assembly includes a piston having a crown with an upper combustion surface with a cylindrical outer surface extending downwardly from the upper combustion surface. A pair of pin bosses depends from the crown to a pair of pin bores having generally cylindrical bearing surfaces aligned along a pin bore axis with a top wall portion extending between the pin bosses. The top wall portion has a concave bearing surface forming a continuous concave bearing surface with the pin bores. A separate skirt is fixed to the piston against relative movement. At least one rib extends upwardly from the top wall portion of the piston on opposite sides of the pin bore axis to a lower wall surface of the crown. The at least one rib joins the crown to the top wall portion to provide structural support to the top wall portion against unwanted deflection.