Four-Stroke Engine Lubrication Device with Mist Recycling
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Solution Overview
Problem
Four-stroke engines used in portable work machines face issues with lubricant flow at varying angles, leading to engine misalignment, excessive lubricant consumption, and air filter contamination, as existing lubrication devices fail to effectively lubricate mechanical parts and prevent lubricant from entering the air-intake system.
Innovation Solution
A lubrication device with a long and narrow concave stirring chamber, oil supply and recycling channels, and eccentric apertures with airtight plugs, allowing lubricant mists to cycle between the crankcase and cam room while preventing larger oil droplets from entering the air-intake system, utilizing centrifugal force to manage lubricant flow and maintain proper lubrication at various angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a four-stroke engine is integrated with a lubrication device and applied to portable work machines, then the engine can operate with proper lubrication for cams and valves, but lubricant may flow into exhaust valves and air mixture flow path when manipulated at slanting or upside down angles, causing engine oil leakage and interfering with combustion
Solution Approach 1:
The lubrication system is segmented into distinct functional zones: a lubricant storage chamber separated from the combustion chamber by a partition wall, with controlled oil delivery pathways that prevent unauthorized lubricant flow into the combustion system regardless of engine orientation
Solution Approach 2:
A partition wall acts as an intermediary barrier between the lubricant storage chamber and the combustion chamber, physically preventing lubricant from flowing into the air mixture flow path and exhaust valve areas while still allowing controlled lubrication delivery to cam and valve components
2Reliability
If lubricant tank is positioned to allow lubricant flow to mechanical parts, then effective lubrication is provided, but massive lubricant may flow into crank case and air-intake system when engine is at slanting angle, causing engine extinguishment
Solution Approach 1:
The partition wall creates localized lubrication zones where lubricant is delivered only to specific mechanical parts (cam and valve areas) through controlled pathways, rather than allowing free flow throughout the entire engine compartment, preventing contamination of air intake and crank case areas
Solution Approach 2:
The harmful aspect of uncontrolled lubricant flow is extracted and isolated by separating the lubricant storage function from the combustion and air intake spaces using a partition wall, allowing the lubrication function to be performed while preventing the harmful side effect of lubricant contamination in other areas
3Speed
If traditional breathing pipe is used without filter, then air flow is maintained, but lubricant flows out via breathing pipe at slanting angles, causing air filter contamination and unnecessary lubricant consumption
Solution Approach 1:
The partition wall serves as an intermediary barrier that intercepts lubricant before it can reach the breathing pipe outlet, preventing lubricant from contaminating the air filter while maintaining unrestricted air flow through the breathing pipe
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
Enables effective lubrication of four-stroke engines at various angles, preventing engine misalignment and air filter contamination by ensuring lubricant mists are recycled efficiently, reducing lubricant consumption and maintaining engine performance.
Implementation Method 1
an oil stirring rod (23), which is allocated at bottom end of the piston connecting rod (21) corresponding to the stirring chamber (34) for stirring the lubricant (71) to lubricant mists
Implementation Method 2
utilizing centrifugal force to manage lubricant flow and maintain proper lubrication at various angles
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
A lubricant device of four-stroke engine is provided according to the present invention. The lubricant device is applicable to a four-stroke engine having a cylinder, a crank case, a rocker arm room and a cam room connected to the rocker arm room. The lubricant device mainly has the rocker arm room and the crank case be connected to each other, and the design of alternating oil supply and oil recycling channels enables lubricant mists to cycle from the crank case through the rocker arm room to the cam room and then be re-absorbed into the crank case, thereby allowing engines to be manipulated at various angles.