Four-Cycle Engine Crankcase Partition for Tilted Oil Circulation
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Solution Overview
Problem
Existing four-cycle engines face challenges in maintaining stable oil circulation and preventing backflow when tilted, leading to increased complexity and production costs due to the need for complex internal structures and additional components.
Innovation Solution
A four-cycle engine design featuring a tilted first partition wall with a communication path between the crank room and oil room, allowing oil to circulate effectively regardless of the engine's tilt, using a simple structure with a horizontal and vertical partition wall to manage oil flow and prevent backflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a one-way valve is provided to prevent oil backflow from the oil room to the crank room, then oil circulation is maintained in tilted conditions, but the internal structure becomes complex, increasing the number of components and assembly man-hour
Solution Approach 1:
The invention extracts and eliminates the one-way valve component from the system by redesigning the partition wall structure. The tilted first partition wall creates a geometric configuration that naturally prevents oil backflow through gravity and pressure differential, replacing the need for mechanical valve components and simplifying the overall structure.
Solution Approach 2:
The crankcase is segmented into a crank room and an oil room by the tilted first partition wall. This segmentation creates distinct functional zones where oil can be supplied to the crank room during operation while preventing backflow, achieving reliable oil circulation without additional valve components.
2Ease of manufacture
If the engine structure is simplified to reduce production cost, then manufacturing efficiency improves, but the ability to supply oil to the interior of the engine in tilted conditions may be compromised
Solution Approach 1:
The invention changes the geometric parameter of the partition wall by tilting it at a specific angle. This parameter change creates a self-regulating oil flow system where the tilted configuration naturally directs oil flow during engine operation and prevents backflow during tilting, achieving reliable oil supply without complex additional structures.
Solution Approach 2:
The tilted first partition wall creates a configuration where oil pressure and gravity work together to maintain oil supply. The geometric design ensures that under normal operating conditions, oil can flow from the oil room to the crank room, while in tilted positions, the same geometry prevents backflow, maintaining equipotential oil distribution throughout the engine.
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 efficient oil circulation and prevents backflow in tilted conditions with a simplified structure, reducing production costs and maintaining engine performance.
Implementation Method 1
a first partition wall tilted as viewed from a direction in which the crankshaft rotates in a clockwise direction, extending in the horizontal direction of the crankcase; a communication path between the crank room and the oil room
Data Source
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AI summary
There is provided a four-cycle engine which can appropriately circulate oil in an engine regardless of a tilted condition with a simple structure. A crankcase (4) of a four-cycle engine (1) has a crank room (41) which rotatably supports a crankshaft (10) and an oil room (42) which is provided adjacent to the exterior of the crank room (41). The crankcase (4) also has partition walls (43) and (44) which partition the interior of the crankcase (4) into the crank room (41) and the oil room (42), respectively, and a communication path (45) which communicates the crank room (41) with the oil room (42). The partition walls (43) and (44) each has a cross section formed in a substantially V shape, and the communication path (45) is formed at an apex between the partition walls (43) and (44).