Passive Rail Switch Layout for Below-Track Suspended Cabins

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Solution Overview

Problem

Conventional rail-bound traffic systems face challenges in attaching transport loads below the track plane due to the design of switches with tongues and continuous intermediate rails, which are not suitable for monorail tracks, and are susceptible to weather interference.

Innovation Solution

A passive switch with two intermediate tracks defined by running-wheel and supporting-wheel intermediate rails, allowing uninterrupted wheel-rail contact and lateral guidance, enabling a rail vehicle to change tracks without moving parts, and positioning the transport load below the track plane.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If conventional railroad switches with tongues and continuous intermediate rails are used, then track switching is enabled, but the transport load cannot be attached below the track plane and the system is susceptible to weather interference

Engineering Contradiction:

Improveability to attach transport load below track planeVSAvoidsusceptibility to weather interference

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The switch is divided into multiple segments including a first intermediate track and a second intermediate track, each with their own running-wheel intermediate rails and supporting-wheel intermediate rails. This segmentation allows the switch to accommodate vehicles with transport loads positioned below the track plane while maintaining reliable wheel-rail contact through distributed contact points across multiple segmented rails

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces intermediate rails (both running-wheel intermediate rails and supporting-wheel intermediate rails) as mediators between the vehicle wheels and the main tracks. These intermediate rails serve as a buffer and guidance mechanism that enables smooth track switching while maintaining continuous wheel-rail contact, thereby reducing susceptibility to weather interference and enabling versatile load positioning

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If monorail tracks are used to allow transport load below track plane, then weather resistance is improved, but standardized components are less available

Engineering Contradiction:

Improveresistance to weather interferenceVSAvoidavailability of standardized components

Core Design Contradiction:

Object-affected harmful factorsVSAdaptability or versatility

Solution Approach 1:

The switch design incorporates universal elements that can serve multiple functions: the running-wheel intermediate rails and supporting-wheel intermediate rails work together to provide both guidance and support for the vehicle. The dual-track intermediate system can accommodate different vehicle configurations and switching scenarios, making the component versatile enough to replace multiple specialized components while maintaining weather resistance

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If passive switch design is used to eliminate moving parts, then reliability is improved, but complex rail arrangements are required

Engineering Contradiction:

Improvereliability of switch operationVSAvoidcomplexity of rail arrangement

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent merges the functions of running-wheel guidance and supporting-wheel guidance into a unified intermediate track structure. The first and second intermediate tracks are integrated with their respective running-wheel and supporting-wheel intermediate rails to form a cohesive passive switching system that eliminates moving parts while managing rail arrangement complexity through functional integration

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS20260078550A1Passive switch for a rail-bound traffic system, chassis for a rail-bound traffic system and rail-bound traffic system

Publication Date: 2026.03.19 OTTOBAHN GMBH

AI summary

The invention relates to a passive switch for a track system of a rail-bound traffic system, having: a first track, defined by a first running-wheel rail and a second running-wheel rail, a second track, defined by the first running-wheel rail and a third running-wheel rail, a third track, defined by the second running-wheel rail and a fourth running-wheel rail, a first intermediate track, defined by the first running-wheel rail, a first running-wheel intermediate rail, a second running-wheel intermediate rail and a first supporting-wheel intermediate rail, a second intermediate track, defined by the second running-wheel rail, a third running-wheel intermediate rail, a fourth running-wheel intermediate rail and a second supporting-wheel intermediate rail. The first running-wheel intermediate rail, the second running-wheel intermediate rail and the first supporting-wheel intermediate rail are arranged such that each individual does not intersect a track center line of the second intermediate track.