Integrated Pump Gear Layout for Compact Low-Leak Oil Pumps
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Solution Overview
Problem
Conventional electric oil pumps (EOP) have a high number of parts and increased size due to separate motor and pump regions, leading to manufacturing cost inefficiencies and potential damage during assembly, as well as noise and fluid leakage issues.
Innovation Solution
A pump design that integrates a housing, stator, pump gear with a magnet, and a partition wall, eliminating the need for a rotation shaft and optimizing the placement of gears and stator within the housing to reduce parts and size, while enhancing fluid containment and noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the motor region and pump region are integrated in a single pump structure, then the volume and weight are reduced, but the risk of damage during assembly increases
Solution Approach 1:
The pump is divided into a motor region and a pump region that are integrated but functionally distinct. The motor region includes a stator, rotor, and rotation shaft, while the pump region includes an inner rotor and outer rotor. This segmentation allows each region to be designed and assembled separately before integration, reducing assembly damage risk while maintaining compact volume.
2Ease of manufacture
If the motor part and pump part exist independently in a single pump, then the functional separation is clear, but the number of parts increases
Solution Approach 1:
The motor part and pump part are merged into a single integrated pump structure where the motor region and pump region share common components such as the housing and rotation shaft. This merging reduces the total number of parts while maintaining clear functional separation between motor and pump operations.
3Volume of moving object
If the motor region and pump region are integrated, then the overall size is reduced, but the manufacturing cost may increase due to integration complexity
Solution Approach 1:
The integrated pump structure uses universal components that serve multiple functions. For example, the rotation shaft serves both as a motor component (transmitting rotational force) and as a pump component (driving the inner rotor). The housing accommodates both motor and pump regions. This multi-functionality reduces the need for separate dedicated components, lowering manufacturing costs despite integration.
4Ease of operation
If separate motor and pump regions are used, then the assembly is easier, but the axial length increases
Solution Approach 1:
The motor region and pump region are arranged in different spatial dimensions within the housing rather than being stacked axially. The motor region is positioned with its rotation shaft extending along the axial direction, while the pump region is positioned radially adjacent to the rotation shaft. This dimensional arrangement reduces axial length while maintaining assembly simplicity.
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 reduces manufacturing costs, miniaturizes the product, inhibits fluid leakage, and reduces noise by integrating the motor and pump regions and placing noise-causing gears within the housing, while protecting the stator from fluid exposure.
Implementation Method 1
The stator includes: a core; an insulator coupled to the core; and a coil wound on the insulator, wherein the magnet may be disposed on an outer peripheral surface of the pump gear to be corresponding to the coil.
Data Source
AI summary
This pump comprises: a housing; a second cover coupled to the housing; a stator disposed inside the housing; a pump gear disposed so as to correspond to the stator; and magnets disposed on the pump gear, wherein the pump gear comprises a first guide part protruding towards the second cover, and the second cover comprises a guide groove into which the first guide part is inserted.