Electric Oil Pump Chamber Isolation for Corrosion Protection
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Solution Overview
Problem
Existing electric oil pumps in vehicle lubrication and cooling systems face challenges in design and performance, with a need for improved sealing and reduced complexity to prevent corrosion and lower costs.
Innovation Solution
The electric oil pump design includes a pump housing with separate inner chambers, a partition portion, and a sealing portion to prevent communication between working media, ensuring better sealing performance and a simpler structure, which reduces the need for additional corrosion prevention structures and lowers costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pump housing is designed as a single integrated chamber, then the structure is simpler and manufacturing is easier, but the working medium can corrode all internal components including the stator and circuit board
Solution Approach 1:
The pump housing is divided into multiple independent chambers: a first chamber for the working medium containing the rotor assembly, and a second chamber for the stator and circuit board assembly. This segmentation isolates corrosive working medium from sensitive electronic and magnetic components, preventing corrosion while maintaining structural integrity through the housing partition.
2Reliability
If additional corrosion prevention structures are added to protect components from working medium, then component protection is improved, but the structure becomes more complex and costs increase
Solution Approach 1:
The housing is segmented into separate chambers with a partition wall, eliminating the need for additional corrosion prevention structures on individual components. The working medium is confined to the first chamber while the stator and circuit board remain in the protected second chamber, achieving component protection through spatial separation rather than protective coatings or barriers.
Solution Approach 2:
The stator and circuit board assembly is extracted from the working medium chamber and placed in a separate sealed chamber. This extraction removes vulnerable components from the corrosive environment entirely, allowing the pump to operate reliably without additional corrosion prevention measures on these components.
3Ease of repair
If the stator and circuit board are placed in the same chamber as the working medium, then the structure is simpler, but maintenance becomes more difficult and reliability decreases due to corrosion risk
Solution Approach 1:
The housing is divided into a first chamber for the rotor and working medium, and a second chamber for the stator and circuit board. This segmentation allows independent access to each chamber for maintenance purposes while protecting sensitive components from corrosion, thereby improving both reliability and ease of repair.
Data Source
Figure 1~2a
Figure 2b~2c
Figure 2d~3
AI summary
An electric oil pump (100) comprises a pump housing, a first rotor assembly (8), a pump shaft (5), a second rotor assembly (3), a stator assembly (4), and a circuit board assembly (6). The pump housing comprises at least a first housing (1), a second housing (2), and a third housing (7). A first cavity (80) is formed between the first housing (1) and the second housing (2). A second cavity (90) is formed between the second housing (2) and the third housing (7). The first rotor assembly (8) is accommodated in the first cavity (80). The second rotor assembly (3), the stator assembly (4), and the circuit board assembly (6) are accommodated in the second cavity (90). The first cavity (80) and the second cavity (90) are isolated by an isolation portion (22), such that working media provided therein do not communicate with each other.