Unidirectional Valve for Oblique Engine Oil Control
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Solution Overview
Problem
In general-purpose engines with an inclined cylinder block, a significant amount of oil from the crank chamber flows into the valve operating chamber, leading to a decrease in oil reserves in the crank chamber, which hinders lubrication due to insufficient oil spray generation.
Innovation Solution
A unidirectional valve is installed in the upper oil passage to allow fluid flow from the crank chamber to the valve operating chamber while blocking reverse flow, using positive pressures to push oil back into the crank chamber, ensuring consistent lubrication by maintaining oil reserves in the crank chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the cylinder block is extended obliquely to reduce engine height, then the engine can be mounted in tighter spaces, but oil flows from the crank chamber into the valve operating chamber when the engine inclines, depleting oil reserves and hindering lubrication
Solution Approach 1:
A unidirectional valve is introduced as an intermediary component in the upper oil passage to control oil flow direction. The valve allows oil to flow from the crank chamber to the valve operating chamber during normal operation but prevents reverse flow when the engine inclines, thereby mediating between the oblique cylinder block configuration and lubrication reliability requirements
Solution Approach 2:
The invention changes the flow control parameter by introducing a unidirectional valve that alters the oil flow direction based on pressure differential. When the engine inclines and oil pressure changes, the valve automatically adjusts to maintain proper oil flow direction, preventing oil depletion from the crank chamber while maintaining the oblique cylinder block design
2Adaptability or versatility
If the cylinder block is made oblique to accommodate compact mounting, then the engine fits better in limited spaces, but oil spray generation becomes insufficient when the engine is forced to be oriented with further slant, hindering lubrication
Solution Approach 1:
The unidirectional valve serves as a mediator that protects the oil spray generation system from the harmful effects of extreme inclining. By preventing oil from flowing back into the valve operating chamber during severe inclination, the valve ensures that the oil spray generating means maintains sufficient oil reserves to continue lubricating engine parts effectively
Solution Approach 2:
The unidirectional valve provides beforehand protection by preventing oil flow reversal before it can deplete the crank chamber oil reserves. This preemptive measure ensures that even when the engine is forced into severe inclination positions, the oil spray generation system maintains adequate oil supply for continuous lubrication
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
This solution prevents a decrease in oil reserves in the crank chamber, allowing the oil spray generating means to consistently lubricate engine parts, even when the engine is oriented with a further slanted cylinder block, thereby ensuring effective lubrication of engine components.
Implementation Method 1
positive pressures transmitted from the crank chamber to the valve operating chamber via the unidirectional valve push the oil, which once flows into the valve operating chamber, back to the crank chamber
Data Source
AI summary
In a general-purpose engine including a cylinder block extending obliquely from one side of a crank case, and a cylinder head connected to an end surface of the cylinder block via a gasket, a unidirectional valve for allowing a flow of a fluid from a crank chamber to a valve operating chamber and blocking a reverse flow of the fluid is installed in an upper oil passage. In a case where lubricant oil reserved in the crank chamber flows into the valve operating chamber via a lower oil passage when the engine inclines such that the inclined cylinder block further slants, positive pressures transmitted from the crank chamber to the valve operating chamber push the oil, which once flows into the valve operating chamber, back to the crank chamber via the lower oil passage.