Resin Electric Liquid Pump Body for Lightweight Shaft Support
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Solution Overview
Problem
Existing electric liquid pumps, such as those described in JP2017-066975A, face challenges in reducing weight and manufacturing costs due to the use of metal components and the need for precise machining, making them unsuitable for applications like in-vehicle pumps.
Innovation Solution
The electric liquid pump is designed with a motor rotor, inner and outer rotors, and a body made of thermosetting resin, eliminating the need for metal bearings and reducing the number of components by integrating the functions of a cover and casing into a single body, which supports the shaft and accommodates the motor and pump components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If metal components are used for the cover and casing to ensure high dimensional accuracy and support the drive shaft, then the structural strength and precision are improved, but the weight of the electric liquid pump increases and manufacturing cost rises
Solution Approach 1:
The patent changes the material parameter from metal to resin, achieving weight reduction while maintaining sufficient dimensional accuracy through optimized resin molding processes and design
Solution Approach 2:
The patent merges the cover and casing into a single integrated body made of resin, reducing the number of metal components and assembly steps, thereby lowering weight and manufacturing cost while maintaining structural precision
2Reliability
If metal components and additional parts like metal plate and bearing are used to support the drive shaft, then the reliability and support function are improved, but the weight and manufacturing cost increase
Solution Approach 1:
The patent integrates the support function directly into the resin body structure, eliminating separate metal bearing components and simplifying the overall device structure while maintaining reliable shaft support
Solution Approach 2:
The resin body serves multiple functions simultaneously: it provides structural support, acts as a bearing surface, and maintains dimensional accuracy, replacing multiple specialized metal components with a single multi-functional element
Data Source
AI summary
An electric liquid pump has a motor, a liquid pump including an inner rotor having an external tooth and integrated with an axial end of a shaft of the motor and an outer rotor having an internal tooth meshing with the external tooth and forming a gap into which a liquid is suctioned and from which the liquid is discharged, a motor case having a box shape and including therein a first accommodation chamber, a second accommodation chamber, and a partition wall allowing the first and second accommodation chambers to communicate with each other, and a body including a centering body portion, a general body portion, and a bearing portion formed to penetrate the centering body portion and the general body portion. The entire body is made of a thermosetting resin.