Multi-Cylinder Engine Central Intake Valve Combustion
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Solution Overview
Problem
Existing single-cylinder internal combustion engines used in outdoor power equipment face limitations in performance and efficiency, particularly in terms of power output and combustion uniformity, due to their design and configuration.
Innovation Solution
A multiple cylinder internal combustion engine design featuring two cylinders with a centrally positioned intake valve and offset exhaust valve, coupled with a crankshaft oriented vertically, enhances fuel-air mixture mixing and distribution, leading to improved power generation and thermal efficiency through optimized valve actuation and combustion chamber configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single-cylinder engine design is used, then the engine structure is simple and cost-effective, but the power output and combustion uniformity are limited
Solution Approach 1:
The engine is divided into multiple cylinders (first cylinder and second cylinder) with separate combustion chambers, allowing each cylinder to contribute to power output. This segmentation enables the engine to generate more power while maintaining a relatively simple structure by using identical or similar cylinder designs that can be manufactured using the same processes.
2Ease of manufacture
If a single-cylinder engine design is used, then the engine structure is simple, but the combustion uniformity is limited
Solution Approach 1:
By segmenting the combustion process across multiple cylinders with shared combustion chamber features, the engine achieves more uniform overall combustion. Each cylinder undergoes the same combustion cycle, and the shared combustion chamber design ensures consistent combustion characteristics across all cylinders, leading to uniform power delivery.
Solution Approach 2:
The combustion chamber is merged and shared between multiple cylinders, allowing uniform fuel-air mixture distribution and combustion characteristics to be achieved across all cylinders. This merging of the combustion chamber space enables consistent combustion uniformity while maintaining structural simplicity.
3Power
If multiple cylinders are used, then power output and combustion uniformity are improved, but the device complexity increases
Solution Approach 1:
Multiple cylinders share a common combustion chamber and valve system, reducing the number of separate components needed. The intake valve and exhaust valve are shared among all cylinders, and the combustion chamber serves multiple cylinders, thereby reducing overall device complexity despite having multiple cylinders for increased power output.
Solution Approach 2:
The combustion chamber and valve system perform multiple functions by serving all cylinders. A single intake valve supplies fuel-air mixture to all cylinders, and a single exhaust valve collects exhaust from all cylinders, making these components universal rather than dedicated to individual cylinders, thus reducing complexity.
4Stability of the object's composition
If a centrally positioned intake valve is used, then fuel-air mixture mixing and distribution are improved, but the valve actuation mechanism becomes more complex
Solution Approach 1:
The valve actuation mechanisms for multiple cylinders are merged into a single system. A single intake valve and single exhaust valve are actuated by shared rocker arms and cam lobes, reducing the complexity of the actuation mechanism while maintaining centralized positioning for optimal fuel-air mixture distribution across all cylinders.
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 engine achieves more uniform power production, complete combustion, and increased efficiency by ensuring a more uniform fuel-air mixture distribution and enhanced mixing within the combustion chamber, thereby improving overall engine performance.
Implementation Method 1
An ignition source may be at least partially disposed within the combustion chamber
Implementation Method 2
The ignition source may include a spark plug
Implementation Method 3
A crankshaft may be coupled with the first piston and the second piston for rotational motion associated with reciprocating movement of at least one of the first piston and the second piston
Data Source
AI summary
An internal combustion engine may include a first piston reciprocatingly disposed in a first cylinder, and a second piston reciprocatingly disposed in a second cylinder. A crankshaft may be coupled with the first piston and the second piston for rotational motion associated with reciprocating movement of at least one of the first piston and the second piston. A combustion chamber may be fluidly coupled with the first cylinder and the second cylinder. An intake valve may provide selective fluid communication between an intake system and the combustion chamber. The intake valve may be generally centrally disposed relative to the first cylinder and the second cylinder. An exhaust valve may provide selective fluid communication between an exhaust system and the combustion chamber. An ignition source may be at least partially disposed within the combustion chamber.