Elastic Rubber Pot Mount for Precise Rotor Shaft Positioning

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Solution Overview

Problem

The precise orientation and positioning of the rotor shaft in relation to the bearing block in electric motors is challenging due to limited installation space and tight tolerances, while maintaining a simple construction to keep costs and assembly effort low.

Innovation Solution

A positioning apparatus configured partially from an elastic material, such as rubber, is used to receive the rotor shaft end, incorporating features like a fixing device, holding device, and a dust protection cap to ensure precise orientation and protection, while allowing for a simple assembly.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If traditional rigid positioning structures are used for the rotor shaft, then positioning precision can be achieved, but the construction becomes complex and assembly effort increases

Engineering Contradiction:

Improvepositioning precisionVSAvoidconstruction complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent changes the material parameter from rigid to elastic, allowing the positioning apparatus to achieve precise positioning through elastic deformation rather than complex rigid structures. The elastic material naturally conforms to the rotor shaft while maintaining precise orientation, eliminating the need for multiple adjustment components.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The positioning apparatus is made from elastic material that can flexibly adapt to the rotor shaft dimensions. This flexible approach allows the apparatus to achieve precise positioning through material elasticity rather than through complex mechanical adjustment mechanisms, thereby reducing construction complexity.

Inventive Principle:

Principle #30Flexible shells and thin films

2Manufacturing precision

If tight tolerances are enforced for rotor shaft positioning, then orientation precision improves, but assembly difficulty and costs increase

Engineering Contradiction:

Improveorientation precisionVSAvoidassembly ease

Core Design Contradiction:

Manufacturing precisionVSEase of manufacture

Solution Approach 1:

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The elastic positioning apparatus self-adjusts to the rotor shaft dimensions through elastic deformation, automatically achieving the required orientation precision without requiring manual adjustment or tight manufacturing tolerances on multiple components. This self-adjusting capability simplifies assembly while maintaining high precision.

Inventive Principle:

Principle #25Self-service

3Manufacturing precision

If multiple separate components are used for positioning, then positioning accuracy can be maintained, but the number of parts increases and assembly effort increases

Engineering Contradiction:

Improvepositioning accuracyVSAvoidnumber of parts

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent merges multiple positioning functions into a single integrated elastic positioning apparatus. This unified structure performs orientation, positioning, and alignment functions simultaneously, eliminating the need for multiple separate components while maintaining high positioning accuracy through the elastic material's inherent properties.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The elastic positioning apparatus serves multiple functions simultaneously: it positions the rotor shaft, orients it precisely, and adapts to dimensional variations. This multi-functional design replaces what would traditionally require several separate components, reducing the total number of parts while maintaining positioning accuracy.

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

The solution enables precise orientation and positioning of the rotor shaft, prevents dust ingress, and simplifies assembly, thereby reducing costs and effort.

Implementation Method 1

the positioning apparatus is configured at least partially from an elastic material and in a substantially pot-like manner with an interior and can be positioned in a central recess of the bearing block for at least partially receiving a first end of the rotor shaft

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS12587062B2Electric motor positioning apparatus including rubber pot

Publication Date: 2026.03.24 HILTI AG

AI summary

Positioning apparatus for an electric motor and bearing block, wherein the electric motor includes a rotor, a rotor shaft and a stator. The positioning apparatus is configured at least partially from an elastic material and in a substantially pot-like manner with an interior and can be positioned in a central recess of the bearing block for at least partially receiving a first end of the rotor shaft.