Differential-Stroke Piston Seat with Cushioning Mechanism
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Solution Overview
Problem
Conventional differential-stroke cycle combustion engines face challenges with the inner piston part's seating impact and noise issues due to the dynamic contact forces during the combustion cycle, which can lead to structural damage and reduced engine efficiency.
Innovation Solution
A piston seat apparatus with a cushioning mechanism, height adjustment, and locking means is introduced to absorb impact forces, mitigate noise, and control the piston seat height, utilizing a piston seat cover and cup with a spring bias and fluid management to adjust the seat height and maintain it under compression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the inner piston part is directly seated on the outer piston part during compression, then the compression force is transmitted efficiently, but impact forces and noise increase due to dynamic contact
Solution Approach 1:
A cushioning mechanism is introduced between the inner and outer piston parts to absorb impact forces before they can cause damage or noise. This cushioning element compresses during the seating process, reducing the dynamic contact forces and associated noise while maintaining efficient force transmission during normal operation.
Solution Approach 2:
An intermediary cushioning element is placed between the inner piston part and outer piston part to mediate the contact forces. This intermediary component absorbs the impact energy during the seating process, reducing noise and structural damage while still allowing effective compression force transmission when needed.
2Device complexity
If the piston seat height is fixed, then the structure is simple, but the compression ratio cannot be optimized under varying combustion pressures
Solution Approach 1:
The piston seat height is made adjustable rather than fixed, allowing the system to adapt to varying combustion pressures. The height adjustment mechanism enables optimization of the compression ratio during different phases of the combustion cycle while maintaining structural simplicity through a straightforward adjustment and locking system.
Solution Approach 2:
The piston seat height parameter is made variable to optimize compression ratio under different combustion conditions. A locking mechanism is provided to maintain the adjusted height during operation, allowing parameter change without compromising structural simplicity or operational stability.
3Productivity
If the inner piston part moves independently during exhaust and intake, then the four-stroke cycle is completed in one revolution, but the seating impact between piston parts increases
Solution Approach 1:
The cushioning mechanism is positioned to absorb impact forces during the independent movement phase of the inner piston part. This allows the differential-stroke cycle to operate at high speed with reduced seating impact, as the cushioning element compresses to absorb the dynamic contact forces generated during independent piston movement.
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 solution effectively reduces noise and impact forces, enhances engine efficiency by optimizing the compression ratio, and prevents fuel mixture knocking, while maintaining the adjusted seat height during the combustion cycle.
Implementation Method 1
the piston seat cover is biased toward an extended position for receiving the abutting engagement. More preferably, the piston seat cover is biased by a compression spring.
Implementation Method 2
the piston seat cavity is fillable with engine oil during operation of the combustion engine
Data Source
AI summary
A piston seat method and apparatus for a differential-stroke cycle combustion engine, the combustion engine including one or more two-part pistons, each two-part piston having a first piston part and a second piston part. The apparatus comprising: a piston seat cover operatively associated with the first piston part, the piston seat cover being adapted for abutting engagement with the second piston part; wherein, upon abutting engagement, the seat cover is adapted to move relative to the first piston part, thereby at least partially absorbing impact forces applied between the first piston part and the second piston part.