Steering Unit with Horizontal and Vertical Wheels for Transport Vehicle Branching
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Solution Overview
Problem
Existing transport systems in semiconductor fabrication facilities face challenges in smoothly navigating transport vehicles through branching parts of drive paths, often resulting in vibrations and shocks during straight movement or branching driving.
Innovation Solution
A transport vehicle system equipped with a driving unit and a steering unit, featuring horizontal and vertical steering wheels that selectively contact guide rails at branching points, allowing for smooth navigation by adjusting wheel contact points to minimize shock and vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the transport vehicle drives at high speed through a branching part, then productivity is improved, but vibration and shock increase causing unstable operation
Solution Approach 1:
The steering mechanism is divided into multiple independent steering wheels (first steering wheel, second steering wheel, third steering wheel, fourth steering wheel) that can contact different surfaces of the guide rail structure. This segmentation allows the system to distribute contact forces and smoothly transition between straight and branched paths without generating excessive vibration or shock, thereby maintaining operational stability at high speeds.
2Device complexity
If the transport vehicle uses a simple steering mechanism, then device complexity is reduced, but it cannot smoothly navigate branching parts without vibration and shock
Solution Approach 1:
The guide rail structure is designed with multi-dimensional surfaces including vertical surfaces and inclined surfaces. The steering wheels can contact different surfaces depending on the required steering angle, utilizing spatial geometry to achieve smooth navigation through branching parts. This dimensional approach allows complex steering functionality without requiring overly complex mechanical mechanisms.
3Reliability
If the transport vehicle maintains continuous contact with guide rails during steering, then operation stability is improved, but device complexity increases due to multiple steering wheels and guide rail structures
Solution Approach 1:
The guide rail structure serves multiple functions: it provides structural support, defines the branching path geometry, and offers multiple contact surfaces (vertical and inclined) for the steering wheels. The steering wheels similarly serve both steering and stabilization functions by maintaining contact with the guide rail surfaces. This multi-functionality reduces the need for separate components, balancing reliability improvement with controlled complexity.
Data Source
AI summary
A transport system in a fabrication facility includes a driving unit moving along a driving rail, and a steering unit selectively contacting a steering guide rail at a branching part where the driving rail branches off. The steering unit includes horizontal steering wheels contacting a vertical guide part of the steering guide rail, and vertical steering wheels contacting a horizontal guide part of the steering guide rail.