Monorail Drive Wheel Load via Gravity Offset
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Solution Overview
Problem
Existing monorail vehicles face limitations in achieving high accelerations while being light and low-cost, particularly when traveling on low-grade rails with substantial profile variations, as prior solutions either rely on additional springs or hydraulic elements or fail to effectively increase drive wheel contact load.
Innovation Solution
A monorail vehicle apparatus that judiciously places its center of gravity to create a moment about a pivot point, using non-parallel bearing and contact surfaces to enhance the normal load on drive wheels without additional springs or hydraulic elements, by offsetting the center of gravity longitudinally and laterally to amplify the drive wheel load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If springs or hydraulic elements are used to increase drive wheel contact load, then traction and acceleration capability are improved, but device complexity and cost increase
Solution Approach 1:
The patent removes springs and hydraulic elements from the system, extracting the complexity-generating components while maintaining the essential function of increasing drive wheel contact load through gravity-based center of gravity positioning
Solution Approach 2:
The vehicle's own weight and center of gravity positioning serve the dual purpose of propulsion and traction enhancement, eliminating the need for external assistance systems like springs or hydraulics
2Force
If additional springs are used to increase normal load on drive wheels, then traction is improved, but weight and cost increase
Solution Approach 1:
The patent extracts the springs from the system, eliminating the additional weight they would contribute while achieving the same normal load enhancement through center of gravity positioning
Solution Approach 2:
The patent strategically positions the center of gravity to create a moment that counteracts the reduction in normal load that would otherwise occur on the drive wheels, effectively using the vehicle's own weight distribution to maintain traction
3Productivity
If hydraulic elements are used to increase drive wheel contact load, then acceleration capability is improved, but cost and device complexity increase
Solution Approach 1:
The patent removes hydraulic elements from the system, eliminating the manufacturing complexity and cost associated with these components while maintaining acceleration capability through simplified gravity-based design
Solution Approach 2:
The patent replaces complex hydraulic systems with a simpler mechanical approach based on center of gravity positioning and gravitational moments, achieving the same functional outcome with greater manufacturing ease
4Force
If center of gravity is offset to increase drive wheel load, then traction is improved, but vehicle stability may be affected
Solution Approach 1:
The patent applies local quality by positioning the center of gravity specifically at the rear of the vehicle, creating a localized moment that increases drive wheel load without compromising overall vehicle stability through strategic spatial distribution of mass
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
This approach allows for increased drive wheel loads beyond the vehicle's mass alone, enabling high accelerations and improved traction, particularly during rapid acceleration and braking, while maintaining a lightweight and cost-effective design compatible with low-grade rails.
Implementation Method 1
the center of gravity produces a moment Nap about the pivot location
Implementation Method 2
The vehicle has a structure that defines a pivot location against the bearing surface of the guide rail... the center of gravity produces a moment Nap about the pivot location
Implementation Method 3
the contact force adds to the forces resisted by the first assembly on the bearing surface... the value of the resultant normal load is typically much beyond a standard load generated by the mass of the monorail vehicle alone
Data Source
AI summary
Apparatus and method for gravity-augmented preload of drive wheels in a monorail vehicle travelling along a guide rail bearing and contact surfaces that are non-parallel with the gravity vector. The vehicle has a structure defining a pivot location against the bearing surface, as well as first and second assemblies for engaging the rail on the bearing and contact surfaces, respectively. The vehicle is mounted so its center of gravity is at a rear longitudinal offset rrl from the pivot location and a vertical offset rvert from the guide rail. A force and moment balance thus created in a normal load on a drive wheel engaged with the bearing surface at the pivot location, where the load value exceeds a standard normal load generated by the mass of the monorail vehicle alone.