Dual-Drive Vane Oil Pump for Low-Speed Engine Lubrication
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Solution Overview
Problem
Existing oil pumps for motor vehicles are often overpowered and bulky due to the need to handle high demands at low engine speeds, leading to inefficiencies and increased dimensions.
Innovation Solution
Designing an oil pump with a direct drive optimized for medium to high engine speeds and a switchable electric drive connected to a control device to adjust output, allowing the electric drive to supplement the direct drive during increased demand, and using a double-stroke vane pump configuration for efficient and compact operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the oil pump is designed for sufficient delivery rate at low engine speeds, then the oil supply reliability is improved, but the oil pump becomes oversized and bulky
Solution Approach 1:
The drive system is segmented into two independent components: a mechanical direct drive connected to the first movable component, and a switchable electric drive connected to the second movable component. This segmentation allows each drive to be optimized for specific operating conditions, enabling the use of a smaller oil pump while maintaining reliable oil supply across all engine speeds
Solution Approach 2:
The oil pump incorporates two movable components that can be independently controlled by the control device. The electric drive can be switched on or off depending on operating conditions, allowing dynamic adjustment of the pump's delivery rate. This dynamic control enables the pump to maintain sufficient output at low speeds without being permanently oversized
2Volume of moving object
If the direct drive is used for base load, then the oil pump can be smaller, but the delivery capacity is insufficient at low engine speeds
Solution Approach 1:
The oil pump is designed with multi-functionality through its dual-drive system. The mechanical direct drive handles base load operations, while the switchable electric drive provides supplemental capacity when needed. This universal design allows the same pump to efficiently operate across the entire engine speed range, from idle to high-speed conditions
Solution Approach 2:
The control device acts as an intermediary that manages the interaction between the direct drive and electric drive. It monitors operating conditions and switches the electric drive on or off to supplement the direct drive's output, ensuring sufficient delivery capacity is maintained without requiring the pump to be permanently oversized
Data Source
Figure 1
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Figure 4~5
AI summary
The invention relates to a delivery device (2) for a motor vehicle for delivering oil from an oil sump (3) to a lubricating oil circuit of an internal combustion engine (1), which delivery device has as an oil pump (5) a double-stroke vane cell pump (28) having positive guidance of vanes (32). A direct drive (6) of the vane cell pump (28) via the internal combustion engine (1) is designed for a working point P2. An increased or reduced oil demand is compensated for by an electric drive (7) that can be connected. In this way, a compact and very small-dimensioned oil pump (5) can be employed.