Engine Oil Relief Valve Venting for Reverse Flow Prevention
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Solution Overview
Problem
The existing lubricating oil supply systems for internal combustion engines face issues with reverse flow of lubricating oil during idle states, leading to unintended unloading and delays in establishing the desired lubricating oil pressure, which conventional check valves in the main flow passage cannot effectively prevent without causing pressure losses and increased costs.
Innovation Solution
A lubricating oil supply system incorporating a relief valve with a releasable relief channel and a separate ventilation channel, which connects the pressure line to the relief line, preventing reverse flow without the need for check valves in the main flow passage, allowing air to enter and manage pressure effectively during idle states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If check valves are installed in the suction line or pressure line to prevent reverse flow, then reverse flow prevention is improved, but pressure losses increase, leakage occurs, and costs increase
Solution Approach 1:
The invention extracts the reverse flow prevention function from the main flow passage by installing a relief valve in a parallel branch line. This allows the main suction line to remain open without check valves, eliminating pressure losses while still preventing reverse flow through the alternative path provided by the relief valve and reservoir connection.
Solution Approach 2:
The relief valve acts as an intermediary component that mediates between the pressure line and the reservoir. It provides a controlled alternative path for oil flow, allowing the system to prevent reverse flow without blocking the main flow passage, thus avoiding the negative effects of check valves in the primary oil supply route.
2Reliability
If check valves are installed in the suction line or pressure line to prevent reverse flow, then reverse flow prevention is improved, but device complexity and costs increase
Solution Approach 1:
The invention extracts the reverse flow prevention function from the main flow passage by installing a relief valve in a parallel branch line. This allows the main suction line to remain open without check valves, eliminating pressure losses while still preventing reverse flow through the alternative path provided by the relief valve and reservoir connection.
Solution Approach 2:
The relief valve serves multiple functions: it prevents reverse flow during idle states, provides pressure relief during operation, and maintains system simplicity by using a single component rather than multiple check valves in different locations. This multi-functionality reduces overall device complexity.
3Stability of the object's composition
If the reservoir is installed at a low pressure side, then oil drainage back to reservoir is improved, but lubricating oil unloading occurs during idle states
Solution Approach 1:
The relief valve is pre-configured with a connection to the reservoir through the relief line, creating a prepared alternative path before reverse flow occurs. During idle states, this pre-established path immediately prevents oil from draining back through the suction line, maintaining pressure without requiring active control or additional components.
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 effectively prevents excessive reverse flow of lubricating oil in idle states without using check valves, reducing pressure losses and costs, while maintaining proper system operation by allowing air to enter and manage pressure effectively, thus ensuring efficient oil circulation and pressure control.
Implementation Method 1
a separate ventilation channel which fluid-communicatively connects the pressure line to the relief line, wherein the ventilation channel is configured to provide a flow passage for air in a state in which the oil pump is not running
Data Source
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AI summary
The present invention refers to lubricating oil supply system of an internal combustion engine, which comprises an oil pump, a suction port of which is fluid-communicatively connected to a lubricating oil reservoir via a suction line and a discharge port of which is fluid-communicatively connected to a pressure line for supplying pressurized lubricating oil to lubricated sections of the engine, and a relief valve (26), an input port (30) of which is fluid-communicatively connected to the pressure line and an output port (32) of which is fluid-communicatively connected to the lubricating oil reservoir via a relief line (34), wherein the relief valve (26) comprises a releasable relief channel (36) and a separate ventilation channel (38) each fluid-communicatively connecting the pressure line to the relief line (34).