Electric Water Pump Stator Holder for Simpler Motor Assembly
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Solution Overview
Problem
Existing electric water pumps require complex assembly processes for mounting the stator, which adversely affects workability and increases costs.
Innovation Solution
The electric water pump design includes a stator holder made of synthetic resin, with elastic holding portions and projections that simplify the assembly process by allowing the stator to be easily mounted to the motor housing through elastic deformation and vibration welding, eliminating the need for complicated operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the stator is fixed to the fixation member by press fitting and then bolted to the support member, then the stator position is restricted in thrust and radial directions, but the assembling operations become complicated and workability decreases
Solution Approach 1:
The patent combines the press fitting operation and bolt fixation operation into a single integrated assembly step. The stator is simultaneously pressed into the fixation member and secured with bolts in one coordinated action, eliminating the need for separate management of multiple assembly operations while maintaining position restriction reliability
Solution Approach 2:
The fixation member is pre-configured with the bolt connection structure before assembly. The stay portion of the lower end of the fixation member is designed to receive bolts that will secure the stator, preparing the assembly path in advance to simplify the actual assembly process
2Reliability
If multiple fixation operations are used to secure the stator, then the stator is firmly fixed, but the number of working operations increases and manufacturing cost increases
Solution Approach 1:
Multiple fixation functions are merged into the fixation member structure. The fixation member integrates both the press-fit interface and the bolt-mounting interface, allowing simultaneous execution of multiple fixation operations through a single component rather than requiring separate fixation elements
Solution Approach 2:
The fixation member serves multiple functions: it provides the press-fit interface for radial positioning, the stay portion for bolt attachment for axial securing, and acts as a structural support element. This multi-functionality reduces the total number of components and assembly operations required
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 simplifies the assembly process, reduces manufacturing costs, and enhances the efficiency of the assembly while providing effective vibration suppression and improved motor efficiency by minimizing iron loss and heat transmission.
Implementation Method 1
each of the holding portions has a first axial end portion fixed to the base portion and a second axial end portion in elastic contact with the stator, and is structured to hold the stator
Implementation Method 2
The electric water pump may be configured such that: the motor housing is integrally formed of synthetic resin; the stator holder is integrally formed of synthetic resin; and the base portion of the stator holder is welded to the outer axial end portion of the outer wall
Data Source
AI summary
An electric water pump includes a motor housing including an inner wall, an outer wall, and a connection wall. The inner wall has a bottomed tubular shape and forms a first accommodation space inside for accommodating a rotor. The outer wall has a tubular shape, encompasses the inner wall, and forms a second accommodation space inside for accommodating a stator. The connection wall connects the inner wall to the outer wall radially at its impeller side. A stator holder includes a base portion and holding portions. The base portion has an annular shape and is fixed to an outer axial end portion of the outer wall. Each holding portion has a first axial end portion fixed to the base portion and a second axial end portion in elastic contact with the stator, and holds the stator.