Vehicle Oil Management Layout for Splash Loss and Foaming Control
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Solution Overview
Problem
Oil management systems for vehicles face issues with splash losses and foaming due to improper lubricant volume and air introduction, leading to reduced efficiency, increased fuel consumption, and shortened lubricant pump service life.
Innovation Solution
An oil management system featuring a lubricant tank within the differential housing, an air-tight connection between transmission and differential housings, and an air suction pump to maintain excess air pressure, preventing splash losses and foaming by ensuring continuous lubrication and uniform return flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large volume of lubricant is used to ensure continuous lubrication, then the lubrication reliability is improved, but splash losses increase and air is introduced into the lubricant causing foaming
Solution Approach 1:
The lubricant system is segmented into a main lubricant tank and a differential housing with a separate lubricant reservoir. The differential housing is divided into a lubricant-free zone for rotating components and a lubricant storage zone, allowing continuous lubrication supply without immersing components in large volumes of lubricant that would cause splashing.
Solution Approach 2:
A lubricant pump acts as an intermediary device to transport lubricant from the main tank to the differential housing and back. This controlled transport mechanism ensures continuous lubrication supply while preventing uncontrolled splashing that would occur with large volumes of lubricant in the differential housing.
2Loss of energy
If a small volume of lubricant is used to reduce splash losses, then energy efficiency is improved, but air cannot be removed effectively leading to air bubble accumulation and foaming
Solution Approach 1:
The air removal function is extracted from the lubricant volume itself and implemented through a dedicated air suction pump that actively removes air bubbles from the lubricant circuit. This allows small lubricant volumes to be used without compromising air removal capability, as the air pump provides dedicated air extraction independent of lubricant quantity.
Solution Approach 2:
The air suction pump serves as an intermediary device that actively manages air bubble removal from the lubricant system. This dedicated air management mechanism ensures effective air removal even when lubricant volumes are minimized to reduce splashing.
3Reliability
If lubricant is stored in the differential housing to ensure continuous lubrication, then lubrication reliability is improved, but components become immersed in lubricant causing splash losses
Solution Approach 1:
The differential housing is segmented into distinct zones: a lubricant-free zone for rotating components (gears, shafts) and a lubricant storage zone in the lower region. This spatial segmentation allows continuous lubrication supply to components without immersing them in lubricant, thereby eliminating splash losses while maintaining drive efficiency.
Solution Approach 2:
A pressure differential system using air pressure management controls lubricant flow. The air suction pump creates negative pressure in the lubricant tank to actively draw lubricant through the through-passage to the differential housing, ensuring continuous lubrication supply without requiring component immersion in lubricant.
4Reliability
If the lubricant level is raised to prevent air introduction, then lubrication reliability is improved, but rotating components splash in the lubricant causing foaming and energy losses
Solution Approach 1:
The differential housing is segmented into a lubricant-free upper zone for rotating components and a lubricant storage lower zone. The lubricant level in the lower zone can be high without affecting the upper zone, as the through-passage with upper edge restricts lubricant rise. This prevents foaming while ensuring continuous lubrication supply to rotating components.
Solution Approach 2:
The lubricant pump acts as an intermediary that actively transports lubricant from the storage zone to the lubrication points and back. This controlled transport ensures continuous lubrication without requiring high lubricant levels that would cause rotating components to splash and foam.
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 system effectively reduces splash losses and foaming, maintains a stable lubricant level, and enhances drive efficiency by ensuring continuous lubrication without immersion of components, thus extending lubricant pump life and optimizing fuel consumption.
Implementation Method 1
The air suction pump pumps air from the lubricant tank into the transmission housing so that an excess air pressure is maintained in the transmission housing. The differential housing is at ambient pressure which is lower than the excess air pressure in the transmission housing and the air pressure in the lubricant tank is lower than the ambient pressure in the differential housing so that by the air pressure differential the lubricant is conducted from the transmission housing into the differential housing and onward into the lubricant tank.
Implementation Method 2
The air suction pump pumps air from the lubricant tank into the transmission housing so that an excess air pressure is maintained in the transmission housing.
Implementation Method 3
The lubricant pump conveys lubricant from the lubricant tank through the suction line and conducts the lubricant to the lubrication points in the differential housing and the transmission housing.
Data Source
AI summary
An oil management system for a vehicle includes a differential housing, a transmission housing, a lubricant tank, a suction line, a lubricant pump, and an air suction pump. The transmission housing is connected to the differential housing in an air-tight manner, and a lubricant through-passage is defined between the transmission housing and the differential housing. The lubricant tank is provided in the differential housing and has a lubricant suction opening in a lower region. The lubricant pump conveys lubricant from the lubricant tank through the suction line and conducts the lubricant to the lubrication points in the differential housing and the transmission housing. The air suction pump pumps air from the lubricant tank into the transmission housing so that an excess air pressure is maintained in the transmission housing.