Injection-Molded Electric Pump Housing for Simplified Stator Fixing

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Solution Overview

Problem

The fixing of the pump housing, stator assembly, and pin in electric pumps is complicated and requires a simpler method.

Innovation Solution

The stator assembly is covered by an insulating frame with windings, and the entire assembly is encased in a first housing formed by injection molding, which includes a pin hole for the pin, simplifying the fixing process through injection molding.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If traditional fixing methods are used for pump housing, stator assembly and pin, then the connection is achieved, but the assembly process becomes complicated

Engineering Contradiction:

Improveassembly processVSAvoidfixing complexity

Core Design Contradiction:

Ease of manufactureVSDevice complexity

Solution Approach 1:

The patent combines the pump housing, stator assembly, and pin into a single integrated structure through injection molding. The housing is formed as one piece that simultaneously accommodates the stator assembly and provides pin mounting features, eliminating the need for separate fixing operations and reducing assembly complexity.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The stator assembly and pin are pre-positioned as inserts within the housing during the injection molding process. This preliminary positioning allows the housing material to flow around and secure these components in their final positions, eliminating the need for subsequent separate fixing operations.

Inventive Principle:

Principle #10Preliminary action

2Adaptability or versatility

If multiple separate components are used for pump housing, stator assembly and pin, then flexibility is maintained, but the number of parts increases

Engineering Contradiction:

Improvecomponent flexibilityVSAvoidnumber of parts

Core Design Contradiction:

Adaptability or versatilityVSQuantity of substance

Solution Approach 1:

The patent merges the pump housing, stator assembly, and pin into a single integrated component formed by injection molding. This reduces the total number of parts while maintaining the functional flexibility of each component through internal design features and material properties.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The housing serves multiple functions simultaneously: it provides structural support, accommodates the stator assembly, provides mounting features for the pin, and enables electrical connections. This multi-functionality reduces the need for separate dedicated components for each function.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 method simplifies the assembly process and enhances the structural integrity and sealing of the electric pump, reducing complexity and improving electromagnetic compatibility.

Implementation Method 1

the first housing is formed by injection molding with at least the stator assembly as an insert and is fixed to the stator assembly by injection molding

Methodology Applied

Scientific EffectInjection molding:

Data Source

PatentUS12546321B2Electric pump

Publication Date: 2026.02.10 ZHEJIANG SANHUA AUTOMOTIVE COMPONENTS CO LTD

AI summary

An electric pump includes a first housing, a stator assembly, and a pin. The first housing is injection-molded by using the stator assembly as an insert and fixed to the stator assembly by injection molding, and is provided with a pin hole for placing the pin. Thus, the fixation of a pump housing, the stator assembly and the pin is facilitated to be simplified.