Gerotor Pump Spindle Layout for Stable Radial Gap Control
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Solution Overview
Problem
Gerotor pumps experience mechanical and frictional losses, and can be bulky, limiting their efficiency and compactness.
Innovation Solution
The gerotor pump design incorporates a spindle coupled to a gear arrangement, with an intermediate separator that supports an electric circuit board and encloses gerotor gears, and a bearing and spindle configuration that reduces radial clearance and vibration, enhancing magnetic flux consistency and reducing friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional gerotor pump design is used, then the pump can achieve fluid pressurization, but it experiences mechanical and frictional losses and becomes bulky
Solution Approach 1:
The patent combines the drive shaft and spindle into a single integrated component, eliminating the need for separate bearing assemblies and reducing the overall pump volume. The unified spindle structure directly supports the gerotor gears while serving as the rotation axis, thereby reducing mechanical complexity and frictional losses without increasing pump size
Solution Approach 2:
The patent removes traditional bearing components from the design, extracting the support function to the spindle-gear interface itself. By eliminating separate bearings, the design reduces mechanical friction points and simplifies the overall structure, achieving lower energy losses and compact dimensions
2Ease of manufacture
If radial clearance is increased in the gerotor gear arrangement, then ease of assembly is improved, but magnetic flux consistency deteriorates
Solution Approach 1:
The patent applies different clearance specifications to different regions of the gear assembly. The radial clearance is precisely controlled in the magnetic flux path region to maintain consistency, while other non-critical areas allow for greater manufacturing tolerances, thus achieving both assembly ease and flux consistency
Solution Approach 2:
The patent introduces an intermediate separator component that acts as a mediator between the drive mechanism and gerotor gears. This separator provides a precision reference surface that ensures consistent radial clearance without requiring extremely tight tolerances on all components, facilitating easier assembly while maintaining magnetic flux consistency
3Productivity
If the gerotor pump operates at higher speeds, then productivity increases, but vibration and frictional losses increase
Solution Approach 1:
The patent employs a dynamic balance design where the spindle and gerotor gears are configured to maintain optimal clearance during rotation. The flexible coupling allows the system to dynamically adapt to speed variations, reducing vibration at higher operating speeds while maintaining efficient fluid displacement and productivity
Solution Approach 2:
The patent optimizes the radial clearance parameter specifically for high-speed operation. By adjusting the clearance to a precise value that minimizes friction at elevated speeds, the system achieves high productivity while controlling vibration and energy losses that would otherwise increase with speed
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 achieves improved operational efficiency, reduced vibration, and increased speed capabilities by maintaining a consistent magnetic flux gap and minimizing frictional losses, while also allowing for a more compact assembly.
Implementation Method 1
maintaining a consistent magnetic flux gap
Data Source
Figure 1A~1B
Figure 2
Figure 3A
AI summary
Disclosed is a gerotor pump including an inner gear mounted on a first axis, an outer gear mounted on a second axis and meshing internally with the inner gear in an offset manner, and an electrical motor including a rotor and a stator having a radial gap therebetween in a radial direction. The pump also includes a spindle fixedly coupled to the outer gear to facilitate maintaining the radial gap. The spindle is rotatably coupled for rotation about the second axis. The spindle aids in maintaining a consistent radial gap during operation of the gerotor pump. The inner gear may be coupled to a drive shaft for driving the gears. The gerotor pump may be driven via an electric or mechanical driver. A pressure plate may also be positioned adjacent the gerotor gears and within the housing. The spindle and pressure plate help secure the pump parts both axially and radially.