Internal Combustion Engine Oil Return Channel Design
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Solution Overview
Problem
Existing internal combustion engines face challenges in reliably ensuring oil return, especially when the engine is in an inclined position, as existing solutions do not effectively manage oil flow and separation.
Innovation Solution
The design incorporates a centrally located oil return channel connecting the oil separator and oil pan, with the oil return passage sloping outwardly around a cylinder head bolt, and a check valve at the end of the channel, ensuring oil does not overflow and is efficiently directed to the oil pan, even in inclined positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the oil return channel is arranged conventionally (not centrally or not sloped), then the structure is simpler, but oil return reliability deteriorates when the engine is inclined
Solution Approach 1:
The oil return channel is given a specific local quality through its sloped configuration that directs oil flow toward the oil pan. The channel has a downward slope in the direction of oil flow, creating a gravity-assisted flow path that ensures reliable oil return even when the engine is inclined. This local structural characteristic (sloped channel) directly addresses the reliability issue without requiring complex additional components.
Solution Approach 2:
The oil return channel is positioned in a central location and extends in multiple dimensions - running longitudinally along the engine and vertically downward with a slope. This multi-dimensional arrangement ensures that oil can return to the oil pan regardless of the engine's tilt angle, as the central position and downward slope create a gravity-driven flow path that operates effectively in various orientations.
2Productivity
If the oil return channel slopes outwardly around the cylinder head bolt, then oil flow is efficiently directed to the oil pan, but the channel requires more space and complex routing
Solution Approach 1:
The oil return channel is merged with the existing engine structure by routing it around the cylinder head bolt and integrating it with the oil pan. The channel utilizes the space around the bolt, combining the drainage function with the existing structural elements. This merging approach achieves efficient oil drainage without requiring additional dedicated space, as the channel follows the natural contours and available volume within the engine assembly.
3Reliability
If a check valve is added to the oil return channel, then oil overflow is prevented, but the device complexity increases
Solution Approach 1:
The check valve is integrated into the oil return channel system, allowing it to automatically perform its function of preventing oil overflow without requiring external control or additional complex mechanisms. The valve operates autonomously based on oil flow direction and pressure differential, providing self-service overflow protection that adds minimal complexity to the overall system.
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 configuration ensures reliable oil return and prevents overflow, maintaining efficient lubrication and reducing the risk of oil loss, even when the engine is at maximum inclined positions, thereby enhancing engine performance and longevity.
Implementation Method 1
the end of the oil return channel is equipped with a check valve
Implementation Method 2
the oil return channel runs obliquely outwards after entering the cylinder head in the direction of and around a cylinder head bolt
Implementation Method 3
a cyclone oil separator for the crankcase ventilation of internal combustion engines is known from DE 31 28 470 A1
Data Source
Figure 1~3
AI summary
The invention relates to an internal combustion engine, comprising at least one crank housing, at least one cylinder head, at least one cylinder head cover, at least one oil separator and at least one oil sump for collecting returning oil, and at least one oil return duct connecting the oil separator and the oil sump.