Motor Housing Joint Step Structure for Axial Load Robustness

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Solution Overview

Problem

The manufacturing process of motors is complex due to the difficulty in producing a housing with a curved shape, and they are vulnerable to axial loads.

Innovation Solution

A motor design featuring a housing with a first and second step parts in the joint between the flange and main body, symmetrically disposed to enhance robustness against axial loads, and a second housing for additional support.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Shape

If a curved shape joint is used to connect the flange and main body, then the housing can accommodate the rotor and stator properly, but the manufacturing process becomes complex and cost increases

Engineering Contradiction:

Improvecurved shape of jointVSAvoidmanufacturing process complexity

Core Design Contradiction:

ShapeVSEase of manufacture

Solution Approach 1:

The joint is segmented into multiple flat surfaces (first joint surface, second joint surface, third joint surface) instead of a continuous curved surface. This segmentation allows each surface to be manufactured independently using standard machining processes, eliminating the need for complex curved surface manufacturing while maintaining the structural function of the joint.

Inventive Principle:

Principle #1Segmentation

2Shape

If a curved shape joint is used to connect the flange and main body, then the housing can accommodate the rotor and stator properly, but the housing becomes vulnerable to axial load

Engineering Contradiction:

Improvecurved shape of jointVSAvoidrobustness against axial load

Core Design Contradiction:

ShapeVSStrength

Solution Approach 1:

The joint surfaces are designed with specific local geometric features including protrusions and recesses that create localized load-bearing areas. The first, second, and third joint surfaces have different orientations and geometries optimized for specific functions: the first surface for axial load bearing, the second for radial positioning, and the third for securing the flange connection.

Inventive Principle:

Principle #3Local quality

3Ease of manufacture

If simple flat joint surfaces are used to connect the flange and main body, then manufacturing becomes easier, but the housing becomes vulnerable to axial load

Engineering Contradiction:

Improvemanufacturing process simplicityVSAvoidrobustness against axial load

Core Design Contradiction:

Ease of manufactureVSStrength

Solution Approach 1:

The joint surfaces are designed with asymmetric geometries where each surface has a specific orientation and shape optimized for its function. The protrusions and recesses are positioned asymmetrically to create mechanical interlocking that resists axial loads while maintaining manufacturability through standard machining operations.

Inventive Principle:

Principle #4Asymmetry

Data Source

PatentUS12580439B2Motor including a joint including first and second step parts for improving robustness against an axial load

Publication Date: 2026.03.17 LG INNOTEK CO LTD

AI summary

The present invention may provide a motor including a housing, a stator disposed in the housing, a rotor disposed in the stator, and a shaft coupled to the rotor, wherein the housing includes a first housing, the first housing includes a main body, a flange, and a joint disposed between the flange and the main body in an axial direction, the flange includes holes, the joint includes first step parts and second step parts which protrude further outward than an outer surface of the main body in a radial direction, and the first step parts and the second step parts are symmetrically disposed with respect to a reference line passing through a center of one of the holes and a center of the first housing.