Two-Stage Oil Pump Drive for Variable Pressure and Volume
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Solution Overview
Problem
Modern motor vehicles, especially those with dual clutch transmissions, require a delivery device that can generate two different oil delivery pressures and volumes, with one being high for actuating the clutch and low for cooling, which existing designs often overdimension due to pressure and volume requirements not being proportional to engine speed.
Innovation Solution
The delivery device features two pressure stages with a common suction connection and separate outlet connections, utilizing a mechanical direct drive for normal operation and an activatable electric drive for peak loads, allowing for adjustable delivery pressures and volumes, and is designed to be compact and energy-efficient.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single oil pump is designed for maximum delivery pressure and maximum delivery volume, then it can meet all oil demand requirements, but it leads to severe overdimensioning and increased energy consumption
Solution Approach 1:
The oil pump is divided into two separate pressure stages: a first pressure stage connected to the activatable electric drive and a second pressure stage connected to the mechanical direct drive. Each stage can operate independently or together, allowing the system to deliver oil at different pressure and volume combinations without overdimensioning. The first stage handles peak load requirements while the second stage covers continuous operation, eliminating the need for a single oversized pump.
2Adaptability or versatility
If two separate oil pumps are used to meet different pressure and volume requirements, then the oil delivery requirements are satisfied, but the device complexity increases
Solution Approach 1:
Two pressure stages that would traditionally require separate pump units are merged into a single integrated oil pump housing. The first pressure stage with activatable electric drive and the second pressure stage with mechanical direct drive share common components and are housed together, reducing device complexity while maintaining the ability to meet different oil delivery requirements through selective operation of each stage.
3Stress or pressure
If the oil pump is designed for high delivery pressure, then clutch actuation requirements are met, but the delivery volume is insufficient for adequate clutch cooling
Solution Approach 1:
The system dynamically switches between operating modes by selectively activating the electric drive for the first pressure stage. When clutch actuation is required, only the first stage operates at high pressure with limited volume. When clutch cooling is required, both stages operate together to provide high volume at lower pressure, or the second stage operates independently for continuous cooling. This dynamic configuration allows the same pump to meet both high-pressure and high-volume requirements at different times.
Data Source
AI summary
A delivery device for delivering oil from an oil sump in a motor vehicle has an oil pump with two pressure stages. The pressure stages deliver oil from a common suction connection to different outlet connections. The oil is delivered by the pressure stages at different delivery pressures and in different delivery volumes. The delivery device furthermore has a direct drive, which is coupled to an internal combustion engine, and an activatable electric drive.