Pump Bearing Housing Overlap for Axial Stability
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Solution Overview
Problem
The axial system of the inner gear engaged with the shaft in traditional pumps is not stable, leading to unstable rotational stability of the rotor and increased friction between housings, which reduces pump performance and efficiency.
Innovation Solution
A pump design featuring a motor housing, stator, rotor, shaft, pump housing, outer gear, inner gear, and a bearing housing with first and second bearings of different outer diameters, arranged to overlap the rotor perpendicularly, providing enhanced axial system stability and rotational support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional single bearing configuration is used, then device complexity is reduced, but axial system stability deteriorates under high pressure
Solution Approach 1:
The patent divides the bearing support function into multiple segments by using both a first bearing and a second bearing along the shaft. The first bearing supports the shaft at one location while the second bearing supports it at another location, creating segmented support zones that collectively enhance axial system stability under high pressure conditions.
Solution Approach 2:
The patent adds an additional dimension to the bearing configuration by positioning the second bearing in a different radial location relative to the shaft compared to the first bearing. This multi-dimensional arrangement of bearings provides comprehensive axial support that prevents shaft deviation more effectively than a single bearing configuration.
2Volume of moving object
If pump size is reduced for miniaturization, then volume decreases, but axial system stability may deteriorate
Solution Approach 1:
The patent implements a nested arrangement where the second bearing is positioned within the radial space already occupied by the first bearing's support zone. The bearings are arranged concentrically along the shaft, with the second bearing's outer diameter being smaller than the first bearing's outer diameter, allowing compact nesting that minimizes overall pump volume while maintaining stability.
Solution Approach 2:
The patent applies different bearing sizes at different locations along the shaft based on local load requirements. The first bearing has a larger outer diameter to handle higher loads at its position, while the second bearing has a smaller outer diameter suitable for its location, optimizing both stability and space utilization for miniaturization.
3Reliability
If bearings are tightly fitted to prevent dislodging, then reliability improves, but friction and heat generation increase
Solution Approach 1:
The patent introduces bearing retainer components as intermediary elements between the bearings and the pump housing. These retainers secure the bearings in place preventing dislodging during operation, while allowing the bearings themselves to maintain optimal clearance and lubrication, thus preventing excessive friction and heat generation.
Data Source
AI summary
A pump comprises: a motor housing; a stator disposed in the motor housing; a rotor disposed in the stator; a shaft coupled to the rotor; a pump housing coupled to the motor housing; an outer gear disposed in the pump housing; an inner gear disposed within the outer gear and coupled to the shaft; a bearing housing disposed between the rotor and pump housing; and first and second bearings disposed in the bearing housing, wherein the first and second bearings have different outer diameters, and the bearing housing is arranged to at least partially overlap the rotor in a direction perpendicular to the axial direction.