Uniblock Engine Piston Layout for Linear Motion and Low Wear
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Solution Overview
Problem
Conventional reciprocating internal combustion engines face challenges in optimizing the layout and construction of cylinder blocks and cylinder heads, leading to inefficiencies in power output, fuel efficiency, and increased wear and friction due to non-linear piston movements and side forces.
Innovation Solution
The integration of a uniblock design that combines the cylinder block and cylinder head into a single component, incorporating multiple crankshafts and crossheads to constrain piston movement to a linear path, reducing side forces and stress, and the use of added pistons for enhanced air intake and scavenging, thereby improving engine performance and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional separate cylinder block and cylinder head design is used, then manufacturing and assembly are simpler, but engine weight, wear, and friction increase while power output and fuel efficiency decrease
Solution Approach 1:
The patent combines the cylinder block and cylinder head into a single integrated uniblock structure. This merging eliminates the interface between separate components, reducing weight and friction while improving power output. The uniblock design integrates combustion chambers, cylinder bores, and cooling passages into one monolithic structure, achieving better mechanical efficiency without requiring complex gasket assemblies or multiple fastening points.
2Reliability
If conventional piston movement layout is used, then design and manufacturing are easier, but side forces and stress on pistons increase causing more wear and friction
Solution Approach 1:
The patent implements a dynamic engine layout where multiple crankshafts are positioned at different orientations and heights within the uniblock structure. This dynamic arrangement allows pistons to move in optimized paths that reduce side forces during combustion. The varying crankshaft positions enable each piston to have its own optimal movement trajectory, minimizing lateral stresses and improving reliability.
3Productivity
If standard single piston design is used, then engine structure is simpler, but air intake and scavenging efficiency are insufficient
Solution Approach 1:
The patent employs multiple pistons within the uniblock structure, where each piston serves dual functions: combustion and air/scavenging operations. The crosshead mechanism enables these multi-functional pistons to operate efficiently, with some pistons optimized for fuel combustion while others facilitate air intake and exhaust scavenging. This multi-functionality approach improves overall productivity without requiring entirely separate systems.
4Object-affected harmful factors
If conventional engine components are used, then manufacturing is more straightforward, but noise and vibration levels increase
Solution Approach 1:
The integrated uniblock structure merges multiple engine components into one monolithic unit, which inherently reduces noise and vibration by eliminating interfaces and connection points between separate parts. The unified structure provides better structural rigidity and damping characteristics, reducing harmful vibrations and acoustic emissions without requiring additional noise control components or complex assembly procedures.
Data Source
AI summary
A piston can include a piston body formed of a first portion and a second portion. The second portion can include a crown and an outer wall having a perimeter defined by a first circle overlapping with a second circle. The piston can be included in an internal combustion engine and configured as a primary piston, an added piston, or both.