Electric Pump Flange Gravity Alignment Vibration Suppression
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Solution Overview
Problem
Existing electric pump devices experience significant vibration issues due to the imbalance of the stator portion's gravity center relative to the attachment surface, leading to increased resonance and instability, especially when attached to vehicle drive devices.
Innovation Solution
The electric pump device incorporates a housing design with a flange portion whose end surface is positioned between virtual planes that encompass the stator core, winding, and crossover portions, aligning the gravity center of the stator portion with the attachment surface, and utilizes a seal portion and elastic ring member to enhance sealing and cushioning, thereby reducing vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the flange portion is attached to the housing body portion in a conventional manner, then the electric pump device can be assembled, but vibration occurs due to misalignment of the stator portion's gravity center with the attachment surface
Solution Approach 1:
The flange portion is designed with an asymmetric structure where its end surface is positioned between virtual planes that encompass the stator core, winding, and crossover portions. This asymmetric positioning aligns the gravity center of the stator portion with the attachment surface, preventing vibration caused by gravitational imbalance during rotation.
Solution Approach 2:
The patent positions the flange portion's end surface in the axial direction between specific virtual planes, using axial positioning to achieve gravity center alignment. This dimensional approach ensures that the attachment surface coincides with the gravity center of the stator portion, resolving the vibration issue through spatial arrangement.
2Object-affected harmful factors
If the end surface of the flange portion is positioned between the virtual planes encompassing the stator components, then the gravity center aligns with the attachment surface reducing vibration, but the housing design becomes more complex
Solution Approach 1:
The flange portion employs asymmetric positioning relative to the housing body portion, with its end surface located between virtual planes that encompass the stator core, winding, and crossover portions. This asymmetric design aligns the gravity center with the attachment surface, eliminating vibration caused by gravitational imbalance.
Solution Approach 2:
The patent converts the potentially harmful effect of gravitational imbalance into a beneficial alignment by strategically positioning the flange portion's end surface between specific virtual planes. This positioning ensures the attachment surface coincides with the gravity center, transforming what would be a harmful vibration source into a stable mounting configuration.
3Reliability
If the seal portion and elastic ring member are added to enhance sealing, then sealing performance improves, but the device complexity increases
Solution Approach 1:
The seal portion and elastic ring member are integrated into the attachment structure between the flange portion and the attached object. This merging of sealing functions into the existing attachment mechanism provides enhanced sealing performance without requiring entirely separate sealing systems.
Solution Approach 2:
The elastic ring member acts as an intermediary element between the flange portion and the attached object, providing sealing functionality while accommodating slight misalignments or dimensional variations. This intermediary component ensures reliable sealing without requiring precise manufacturing tolerances.
Data Source
AI summary
An electric pump device includes a motor having a rotor and a stator portions, a pump portion and a housing. The stator portion has a stator core, and coils each having a winding portion and a crossover portion. The housing has a housing body portion having a tubular shape and extending in the axial direction, and a flange portion expanding radially outward from the outer peripheral surface of the housing body portion. The flange portion has an end surface that faces toward one side in the axial direction and is disposed in the axial direction between a first and a second virtual plane. The first and the second virtual planes pass through parts of the stator core, the winding portion, and the crossover portion located respectively closest to one and the other sides in the axial direction and expanding in a direction perpendicular to a central axis.