Integrated Mechanical and Electrical Oil Pump for Idling Stop Systems
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Solution Overview
Problem
In vehicles equipped with an idling stop system, it is challenging to ensure space for an electrical pump, making it difficult to employ the system effectively, as mechanical pumps are stopped during engine idle, leading to a lack of oil pressure supply to clutch mechanisms in automatic transmissions.
Innovation Solution
An oil pump apparatus is designed with a mechanical pump driven by the engine and an electrical pump driven by a motor, both installed adjacent to each other in a pump housing, with a blocking plate to prevent suction and ejection port communication, and a one-way interlocking mechanism to transmit power from the mechanical to the electrical pump, allowing the electrical pump to operate during engine stop and reducing the size of the mechanical pump.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an electrical pump is disposed outside the automatic transmission, then oil pressure can be supplied during engine idle stop, but it becomes difficult to ensure installation space in vehicles with limited space
Solution Approach 1:
The patent combines the mechanical pump and electrical pump into a single pump housing, with both pumps installed adjacent to each other in the axial direction within the same housing. This merging approach allows both pumps to share the same installation space, enabling the electrical pump to be integrated without requiring additional external space, thus resolving the contradiction between providing oil pressure during idle stop and maintaining compact installation space.
2Reliability
If a blocking plate is disposed between the mechanical pump and electrical pump, then oil communication between suction and ejection ports is prevented, but the device complexity increases
Solution Approach 1:
The blocking plate divides the internal space of the pump housing into separate regions for the mechanical pump and electrical pump. This segmentation prevents oil communication between the suction and ejection ports of different pumps, ensuring that each pump operates independently with proper oil flow control, thereby improving oil supply efficiency while maintaining a relatively simple structural addition.
3Volume of stationary object
If the mechanical pump is reduced in size, then the pump installation space can be reduced, but the oil supply capacity during engine operation may be insufficient
Solution Approach 1:
The dual-pump system provides multi-functionality where the mechanical pump handles oil supply during engine operation and the electrical pump provides oil supply during engine idle stop. This universal approach ensures that the reduced-size mechanical pump can operate efficiently within its capacity range while the electrical pump compensates during idle conditions, maintaining overall oil supply capacity across all operating conditions while reducing total installation space.
Data Source
AI summary
An oil pump apparatus in which an electrical pump can be easily disposed is provided. A mechanical pump including: an inner gear which is configured to be driven by an engine; and an outer gear which is configured to mesh with the inner gear, and an electrical pump including: an outer gear which is configured to be driven by a motor section; and an inner gear which is configured to mesh with the outer gear are installed adjacent to each other in the axial direction in a pump installation space of a pump housing having suction ports and ejection ports. A blocking plate which is configured to block communications between the suction ports and the ejection ports is disposed between the mechanical pump and the electrical pump.