Internal Combustion Engine Piston Thickened Box Wall Cooling
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Solution Overview
Problem
Existing methods for producing pistons for internal combustion engines are inefficient in ensuring a high retention rate of cooling oil in the cooling channel, often requiring additional components and complex production steps, and may not adequately distance moving parts like the connecting rod.
Innovation Solution
A method involving the formation of thickened portions in box walls to create coolant inlets and outlets, allowing for simple and cost-efficient production, with the option to form these inlets and outlets in a funnel shape and using forging or casting methods, particularly with aluminum or steel, to ensure sufficient cooling oil reaches the channel without additional components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coolant inlets and outlets are formed directly in the piston pin bosses area, then the retention rate of cooling oil is improved, but the distance to moving parts such as connecting rod is reduced
Solution Approach 1:
The patent applies local quality by forming thickened portions specifically in the box walls at locations that are not directly adjacent to the piston pin bosses. This allows the coolant inlets and outlets to be positioned in areas with sufficient material thickness while maintaining an advantageous distance from moving parts like the connecting rod, thus resolving the contradiction between achieving high retention rate and maintaining safe distance from moving parts.
2Reliability
If additional components are used to form coolant inlets and outlets, then the retention rate of cooling oil can be improved, but the production complexity and cost increase
Solution Approach 1:
The patent merges the formation of thickened portions with the creation of coolant inlets and outlets into a single integrated process. The thickened portions are formed directly in the box walls during the piston blank production, and the coolant inlets/outlets are created by opening into these thickened portions. This eliminates the need for additional components and reduces production steps, thereby resolving the contradiction between achieving high retention rate and maintaining simple production.
3Reliability
If thickened portions are formed directly adjacent to piston pin bosses, then the retention rate of cooling oil is improved, but unnecessary material mass is created
Solution Approach 1:
The patent applies local quality by positioning thickened portions in box walls at specific locations that are not directly adjacent to piston pin bosses. This ensures material is added only where necessary for creating the coolant inlets and outlets, avoiding unnecessary material mass while still achieving the required retention rate of cooling oil.
Data Source
AI summary
A method for producing a piston blank or a piston for an internal combustion engine, includes providing a thickened portion formed in at least one box wall in the direction of thickness approximately in the center thereof, which is at least partly flush with a cooling channel. A resulting piston blank or piston having these features can be made in a casting mold or forging die designed in a corresponding manner.