Shaftless Pump Gear Integration for Compact Electric Oil Pumps
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Solution Overview
Problem
Conventional electric oil pumps (EOP) have a complex structure with multiple parts, leading to increased size and manufacturing costs, as well as potential damage during assembly.
Innovation Solution
The pump design eliminates the need for a rotation shaft by integrating a stator, pump gear, and magnet within a housing, where the magnet is mounted on an external gear with a specific curvature and groove design, reducing the number of parts and enhancing rotational efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional EOP structure with separate motor and pump regions is used, then the pump can function properly, but the number of parts increases and the overall size increases
Solution Approach 1:
The motor region and pump region are merged into a single integrated structure where the motor stator serves as the pump housing and the motor rotor and pump gears share the same space. This merging eliminates the need for separate housings and reduces the number of parts while maintaining both motor and pump functions.
Solution Approach 2:
The motor stator is designed to serve dual functions: as the stationary component of the motor and as the housing for the pump chamber. The motor rotor and pump inner rotor are integrated, allowing the same rotating assembly to perform both motor rotation and pump gear functions.
2Reliability
If a conventional EOP structure with separate motor and pump regions is used, then the pump can function properly, but the overall size increases in the axial direction
Solution Approach 1:
The design transitions from a stacked axial arrangement to a radial arrangement where the pump chamber is formed within the motor stator's radial space. The pump gears rotate radially within the motor rotor, utilizing the radial dimension rather than extending axially, thereby reducing the overall axial length.
3Volume of moving object
If an integrated pump-integrated structure is used, then volume and weight are reduced, but damage to the pump may occur during motor assembly
Solution Approach 1:
The pump is divided into separable components (pump gears, seal, etc.) that can be assembled into the motor stator housing after the motor assembly is complete. This segmentation allows the pump components to be installed separately, avoiding damage during motor assembly while maintaining the compact integrated 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
This design reduces the number of parts, lowers manufacturing costs, enables miniaturization, prevents fluid leakage, and reduces noise by housing the gears in the innermost space of the housing.
Implementation Method 1
a magnet disposed on the external gear
Implementation Method 2
the stator, a pump gear disposed to correspond to the stator
Data Source
Figure 1
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Figure 3
AI summary
A pump comprises: a housing: a stator disposed inside the housing; a pump gear which is disposed to correspond to the stator and which includes an external gear and an internal gear; and a magnet disposed on the external gear, wherein the magnet includes a first outer circumferential surface , the external gear includes a second outer circumferential surface , and the curvature of the first outer circumferential surface can be smaller than the curvature of the second outer circumferential surface.