Rotor Shell Alignment Features for Fast Coaxial Spindle Assembly

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Solution Overview

Problem

Changing cutting rotors in milling machines, such as cold planers, is difficult due to the size and weight of the components, leading to poor assembly precision and inefficiency with forklifts providing limited visibility.

Innovation Solution

A system with axial alignment features, such as tapered plates, on the rotor shell and spindle to facilitate precise coaxial alignment during assembly, allowing quick and accurate fitting of the rotor shell onto the spindle.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a forklift is used to assemble the cutting rotor components, then the heavy rotor shell can be positioned, but assembly precision deteriorates due to poor visibility

Engineering Contradiction:

Improveability to position heavy rotor shellVSAvoidassembly precision

Core Design Contradiction:

Ease of operationVSManufacturing precision

Solution Approach 1:

The rotor shell and spindle are designed with self-aligning features (radial alignment feature on rotor shell, axial alignment feature on spindle) that automatically guide precise positioning during assembly, eliminating the need for operator judgment and visual alignment

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

Alignment features act as intermediary elements between the rotor shell and spindle, providing physical guidance and constraint during assembly to ensure precise co-axial positioning without requiring operator skill or visibility

Inventive Principle:

Principle #24Intermediary (Mediator)

2Device complexity

If traditional assembly methods are used without alignment features, then the assembly process is simple, but assembly time increases due to repeated adjustments

Engineering Contradiction:

Improveassembly process simplicityVSAvoidassembly time

Core Design Contradiction:

Device complexityVSLoss of time

Solution Approach 1:

The alignment features are pre-configured on the rotor shell and spindle during manufacturing, establishing the correct co-axial relationship in advance before assembly occurs, so that during assembly the components simply need to be guided into position rather than adjusted repeatedly

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12486626B2Quick change rotor alignment feature

Publication Date: 2025.12.02 CATERPILLAR PAVING PROD INC

AI summary

A milling machine can include a frame, a milling assembly including a cutting rotor and a rotor housing coupled to the frame, the cutting rotor including a rotor shell positioned around a spindle, and a first axial alignment feature on one of the rotor shell or the spindle, the first axial alignment feature including a physical feature on a surface of the rotor shell or the spindle, the physical feature being positioned and configured to contact an opposing flat surface of the opposing rotor shell or spindle so as to guide the rotor shell and the spindle into a co-axial alignment as the rotor shell is loaded axially onto the spindle.