Integrated Electric Oil Pump Housing for Compact Low-Leak Assembly
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Solution Overview
Problem
Electric oil pumps (EOP) have a complex structure with independent motor and pump regions, leading to increased part count, size, and assembly risks, which complicates manufacturing and miniaturization.
Innovation Solution
A pump design that integrates a housing with a first and second area separated by a partition wall, featuring a stator, pump gear with magnets, and a circuit board, where the stator is embedded within the housing to reduce the need for a rotation shaft, minimizing parts and size while preventing fluid leakage and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a pump-integrated structure with motor and pump regions is used, then volume and weight are reduced, but the number of parts increases and assembly complexity increases
Solution Approach 1:
The motor housing and pump housing are merged into a single integrated housing structure. The motor stator is positioned within the housing such that it serves both as the motor component housing and as part of the pump housing structure, eliminating the need for separate motor and pump housings and reducing the total number of parts.
Solution Approach 2:
The housing structure performs multiple functions: it houses the motor stator, supports the pump gear, provides magnetic shielding, and serves as part of the motor assembly. This multi-functionality reduces the number of separate components needed while maintaining compact volume.
2Volume of moving object
If motor housing and pump housing are integrated, then volume is reduced, but assembly damage risk increases
Solution Approach 1:
The housing is divided into functional zones (motor region and pump region) separated by a partition wall, allowing independent assembly and positioning of motor and pump components. The stator is positioned in a specific region with clear spatial relationships to other components, reducing assembly complexity and damage risk.
3Adaptability or versatility
If independent motor and pump regions are used, then functionality is maintained, but product size increases in axial direction
Solution Approach 1:
The design transitions from a conventional axial arrangement to a radial arrangement where the stator is positioned radially within the housing. The pump gear rotates in a plane perpendicular to the stator axis, allowing the motor and pump to share the same axial space and reducing overall axial length.
4Ease of manufacture
If stator is exposed to outside of body, then manufacturing is simpler, but fluid leakage and noise increase
Solution Approach 1:
The stator is nested within the housing body, with the housing providing an enclosing structure. The partition wall creates a contained space for the stator, preventing fluid leakage and isolating noise generated by the pump gear while maintaining manufacturing simplicity through the integrated housing design.
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
This design reduces the number of parts, lowers manufacturing costs, miniaturizes the product, prevents fluid leakage, and reduces noise by embedding the stator and placing gears within the housing.
Implementation Method 1
magnets disposed on the pump gear, wherein the second area includes a second space defined by the first partition wall and the body, and wherein the stator is inserted into the body
Data Source
AI summary
This pump comprises: a housing comprising a body and a first partition which separates first and second areas; a stator disposed in the housing; a circuit board disposed in the first area; a pump gear disposed in the second area; and magnets disposed on the pump gear, wherein the second area includes a second space defined by the first partition wall and the body, and the stator is inserted into the body.