Split Power Gerotor Pump Eccentric Pocket Design
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Solution Overview
Problem
Existing split power gerotor pumps face challenges in efficiently directing and compressing hydraulic fluid between the inner and outer gerotors, leading to suboptimal fluid handling and sealing issues.
Innovation Solution
A split power gerotor pump design featuring a rotational axis, shaft, inner gerotor, eccentric pocket, and outer gerotor with specific lobe configurations, port plates, and seals to facilitate direct engagement with an electric motor, enhancing fluid compression and sealing through a cylindrical bore and toothed profile for improved hydraulic fluid management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hydraulic fluid is directed between inner and outer gerotors using conventional port configurations, then fluid pumping function is achieved, but fluid handling efficiency is suboptimal
Solution Approach 1:
The pump is divided into distinct functional components: inner gerotor with n lobes, outer gerotor with n+1 lobes, and an eccentric pocket that creates separate compression chambers. This segmentation allows optimized fluid flow paths and improved sealing between chambers, directly addressing the contradiction between fluid handling efficiency and sealing performance.
Solution Approach 2:
The eccentric pocket acts as an intermediary element between the inner and outer rotors, creating a controlled interface for fluid compression. The port plates with specifically positioned orifices serve as intermediaries to direct fluid flow into and out of the compression gaps, optimizing both fluid handling and sealing.
2Ease of operation
If the outer gerotor surface directly engages with motor gear or rotor, then drive transmission is achieved, but manufacturing precision requirements increase
Solution Approach 1:
The outer gerotor features an asymmetric toothed profile on its outer surface that engages with the motor gear or rotor. This asymmetric design, combined with the eccentric positioning of the pocket center relative to the rotational axis, creates a self-aligning mechanism that reduces sensitivity to manufacturing tolerances while maintaining effective drive transmission.
3Reliability
If multiple seals are installed to improve sealing, then sealing efficiency is improved, but device complexity increases
Solution Approach 1:
The port plates are integrally formed with the eccentric pocket from the same piece of material, merging what would otherwise be separate components. This integration reduces the number of discrete seal locations and assembly steps while maintaining effective sealing through the unified structure's inherent geometry and fewer interfaces.
Data Source
AI summary
A split power gerotor pump includes a rotational axis, a shaft, an inner gerotor, an eccentric pocket, and an outer gerotor. The inner gerotor is rotationally fixed on the shaft, rotatable about the rotational axis, and includes n first lobes. The eccentric pocket is rotatable about the rotational axis, and includes a cylindrical bore with a center radially offset from the rotational axis and an outer surface, disposed radially outside of the cylindrical bore and arranged for direct engagement with a gear or a rotor for an electric motor. The outer gerotor includes a cylindrical outer surface installed in the cylindrical bore and n+1 second lobes.