Electronic Oil Pump With Integrated Motor Cooling and Flow Control
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Solution Overview
Problem
Conventional electronic oil pumps face challenges in maintaining constant flow rate due to varying oil viscosity, require separate cooling means, experience increased friction and volume, and have higher differential pressure due to narrow passages and same-surface inlet/outlet disposition.
Innovation Solution
An electronic oil pump design that integrates a motor cooling passage within the pumping mechanism, uses a flexible seal between the gerotor and motor cooling space to manage viscosity, and guides oil through a passage formed by the housing shape to maintain consistent flow rate and reduce friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a separate cooling means is added to cool the motor, then the motor cooling effect is improved, but the pump volume and manufacturing cost increase
Solution Approach 1:
The patent merges the cooling function with the pumping function by integrating the cooling passage into the pump housing. The oil pump housing contains both the pumping chamber and the cooling passage, eliminating the need for a separate cooling means. This integration achieves motor cooling while maintaining a compact pump structure and reducing manufacturing costs.
Solution Approach 2:
The pump housing is designed to serve multiple functions: it provides the pumping chamber for oil circulation and simultaneously serves as the cooling passage for motor heat dissipation. This multi-functional design allows the same structural component to fulfill both pumping and cooling roles, reducing overall system complexity and volume.
2Volume of stationary object
If the inlet and outlet are disposed on the same surface with a short oil passage, then the pump structure is compact, but the differential pressure increases
Solution Approach 1:
The patent applies different structural characteristics to different regions of the pump housing. The cooling passage is designed with specific geometric features (such as tapered sections or curved pathways) that optimize fluid flow characteristics. This localized optimization of passage geometry reduces flow resistance and differential pressure while maintaining the compact same-surface inlet/outlet configuration.
3Volume of stationary object
If the passage between gerotor and case is narrow to reduce volume, then the pump size is reduced, but friction increases and pumping efficiency decreases
Solution Approach 1:
The patent employs a flexible seal (such as a lip seal or flexible membrane) between the gerotor and the case. This flexible seal maintains an effective sealing clearance that prevents oil leakage while allowing for thermal expansion and viscosity variations. The flexible seal design optimizes the gap between moving parts, reducing friction and energy loss while maintaining a compact pump structure.
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 design achieves constant oil flow rate, reduces manufacturing costs by eliminating separate cooling, enhances pumping efficiency, and minimizes friction and pressure differentials, while maintaining lubrication efficiency.
Implementation Method 1
a flexible seal sealing the other side of the gerotor, and opened by an internal pressure of the gerotor
Implementation Method 2
the cooling space communicates with the discharge passage for the fluid exchanging heat with the electric motor
Implementation Method 3
a gerotor installed on the seating part, and including an internal rotor and an external rotor engaged with each other to be eccentrically rotated for its one side to communicate with the suction passage and the other side to communicate with the cooling space
Data Source
AI summary
Provided is an electronic oil pump which may circulate oil by driving an electric motor, and more particularly, an electronic oil pump which may vary a cross-sectional area of a pumping passage based on an oil viscosity, and include a cooling passage for cooling a motor.