Three-Wheel Surface Maintenance Machine Design to Reduce Rear Swing

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Solution Overview

Problem

Conventional three-wheeled surface maintenance machines with a steerable front wheel and a non-steerable rear wheel experience rear swing during turns, limiting maneuverability and stability, especially when navigating narrow spaces or turning around obstacles.

Innovation Solution

A surface maintenance machine design featuring two steerable front wheels and a non-steerable rear wheel positioned centrally, with the operator platform located rearward of the transverse centerline, allowing the machine to pivot around a stationary rear wheel and maintain stability during turns, reducing rear swing and improving maneuverability in tight spaces.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a steerable front wheel and non-steerable rear wheel configuration is used, then the machine structure is simplified, but rear swing occurs during turns reducing maneuverability and stability

Engineering Contradiction:

Improvewheel steering mechanism complexityVSAvoidmaneuverability in narrow spaces

Core Design Contradiction:

Device complexityVSEase of operation

Solution Approach 1:

The machine divides the steering function between two front wheels rather than concentrating it in one wheel. This segmentation allows the machine to pivot more effectively around a central point (the rear wheel), reducing rear swing and improving maneuverability in narrow spaces while maintaining structural simplicity

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The machine uses an asymmetric wheel configuration with two front wheels and one rear wheel, positioned to create a triangular support base. This asymmetric arrangement optimizes the pivot point for turning operations, allowing the machine to rotate tightly around the rear wheel while minimizing unwanted rear swing motion

Inventive Principle:

Principle #4Asymmetry

2Stability of the object's composition

If the rear wheel is positioned centrally, then stability during turns is improved, but the operator platform space is reduced

Engineering Contradiction:

Improvestability during turnsVSAvoidoperator platform area

Core Design Contradiction:

Stability of the object's compositionVSArea of moving object

Solution Approach 1:

The operator platform extends in multiple dimensions around the centrally positioned rear wheel, utilizing vertical clearance and lateral space efficiently. This multi-dimensional space utilization provides adequate operator standing area while maintaining central rear wheel positioning for optimal turn stability

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Ease of operation

If two front wheels are positioned to the front of the transverse centerline, then maneuverability is improved, but the machine length increases

Engineering Contradiction:

ImprovemaneuverabilityVSAvoidmachine length

Core Design Contradiction:

Ease of operationVSLength of moving object

Solution Approach 1:

The machine employs dynamic steering capability where the two front wheels can be independently controlled to achieve zero-turn radius operation. This dynamic steering system allows the machine to pivot in place without requiring additional length, maintaining compact dimensions while maximizing maneuverability

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS10456003B2Surface maintenance machine

Publication Date: 2019.10.29 TENNANT CO

AI summary

A surface maintenance machine comprising two front wheels, at least one rear wheel, a motive source for providing motive force to at least one front wheel to drive the machine on a surface. Embodiments also include an operator platform allowing an operator to stand thereon extending at least partly around the rear wheel, for supporting an operator in a standing position with the operator's feet on either side of the rear wheel.