Piston Oil Drainage Layout for V-Engine Oil Return
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Solution Overview
Problem
In V-engines, the angulation of pistons increases flow resistance and splashing of oil, leading to inadequate oil return flow rates, which can result in oil sliding into the combustion chamber, reducing engine performance and increasing hydrocarbon emissions.
Innovation Solution
A piston design featuring an oil drainage groove between the ring belt and piston skirt, with recessed pin boss portions and oil drainage ducts that fluid-communicatively connect the groove with the pin boss portions, ensuring efficient oil drainage into the crankcase, reducing flow resistance and preventing oil slide.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If pistons are angulated in V-engines, then engine compactness and power output are improved, but oil flow resistance increases and oil return flow rate decreases
Solution Approach 1:
The oil drainage system is segmented into multiple functional components: oil drainage groove at the ring belt, multiple oil drainage holes in the piston skirt, and oil drainage passages. This segmentation creates multiple parallel drainage paths that collectively increase the total oil return flow rate despite the angulated configuration of V-engines
Solution Approach 2:
The oil drainage groove is positioned at the ring belt (upper dimension) while oil drainage holes are positioned at the piston skirt (lower dimension), creating a vertical dimensionality change in the drainage path. This multi-dimensional arrangement optimizes oil flow under angulated piston conditions by utilizing both vertical and radial drainage directions
2Device complexity
If conventional oil drainage paths are used in angulated pistons, then device complexity is reduced, but oil slide into combustion chamber occurs
Solution Approach 1:
The oil drainage groove is positioned to receive oil from the ring belt before it can slide into the combustion chamber. The oil drainage holes are strategically positioned to drain oil ahead of time during the piston stroke, preventing oil accumulation that would lead to oil slide. This preliminary drainage action occurs proactively rather than reactively
Solution Approach 2:
The piston skirt acts as an intermediary component between the ring belt oil drainage groove and the crankcase. It contains multiple oil drainage holes and passages that mediate the oil flow, ensuring oil is properly channeled from the upper ring belt area down to the crankcase without allowing oil to escape into the combustion chamber
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 design effectively prevents oil slide into the combustion chamber by ensuring a high flow cross-section for oil return, maintaining engine performance and reducing emissions.
Implementation Method 1
the oil drainage duct is configured to fluid-communicatively connect the oil drainage groove with the recessed pin boss portions
Implementation Method 2
ensuring efficient oil drainage into the crankcase, reducing flow resistance
Data Source
AI summary
The present invention refers to a piston for an internal combustion engine, particularly a V-engine. The piston comprises an oil drainage groove provided in the outer circumferential surface of the piston between a ring belt and a piston skirt of the piston, the piston skirt being provided with two recessed pin boss portions on opposed sides of the piston, wherein the piston skirt is further provided with at least one oil drainage duct arranged between the two recessed pin boss portions at an outer surface of the piston skirt and configured to fluid-communicatively connect the oil drainage groove with the recessed pin boss portions.