Toroidal Vehicle Drivetrain Using Nested Planetary Gears
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The development of drivetrain systems for toroidal vehicles powered by direct current (DC) motors poses challenges due to the unique dimensional characteristics and the need for step-down gear systems to accommodate high-spinning motors within a small, cylindrical space, particularly for navigating challenging environments like the intestines.
Innovation Solution
The implementation of novel drivetrain configurations involving internal curved spiral (ICS) and internal spur (IS) gears, along with various gear types such as worm, hypoid, and bevel gears, to effectively translate the high-speed motor rotation into lower rotational speeds suitable for wheel movement, ensuring low friction and safe propulsion within the toroidal vehicle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high-speed DC motors are used to power the toroidal vehicle, then the motor can be compact and efficient, but the drivetrain must include complex step-down gear systems to reduce rotational speed
Solution Approach 1:
The patent employs planetary gear systems where gears are nested within each other - a small pinion gear at the center, surrounded by planet gears, which are in turn surrounded by a ring gear. This nested configuration achieves significant speed reduction ratios while maintaining a compact footprint that fits within the constrained toroidal vehicle architecture.
Solution Approach 2:
The drivetrain utilizes three-dimensional spatial arrangement of gears in multiple planes and orientations. The planetary gears are distributed radially around the central pinion, and the entire gear system is integrated into the toroidal structure, effectively using volumetric space rather than just linear dimensions to accommodate the complex mechanism.
2Length of moving object
If the vehicle size is reduced to navigate confined spaces like intestines, then the device can access challenging environments, but the available space for mechanical components becomes severely limited
Solution Approach 1:
The drivetrain components are nested within the toroidal structure - the planetary gear system is housed within the tread cavity, and the engagement mechanisms are integrated into the wall structure. This nesting allows the mechanical components to occupy minimal volume while still providing full functionality.
Solution Approach 2:
The toroidal tread structure serves multiple functions: it provides the outer shell of the vehicle, contains the drivetrain components within its cavity, and acts as the propulsion element itself through engagement with the ICS/IS gears. This multi-functionality eliminates the need for separate structural and mechanical components, saving valuable space.
3Speed
If the motor spins at very high rates to maintain compact size, then the motor can be small, but the drivetrain must transform this high speed to lower rotational speed for vehicle movement
Solution Approach 1:
The planetary gear system achieves high speed reduction ratios through nested gearing - the central pinion gear engages with multiple planet gears that rotate on their own axes while simultaneously orbiting the pinion. This nested arrangement provides compact speed reduction without requiring long gear trains.
Solution Approach 2:
The patent combines multiple gear reduction functions into a single integrated planetary gear stage. The planetary mechanism simultaneously provides speed reduction, torque multiplication, and directional change, merging several drivetrain functions into one compact unit rather than using separate gear stages.
4Stability of the object's composition
If internal curved spiral and spur gears are used to engage the toroidal tread, then wheel rotation can be synchronized, but the mechanical connection must prevent sliding against external walls
Solution Approach 1:
The patent employs internal curved spiral gears that conform to the toroidal geometry of the tread. The curved gear teeth engage smoothly with the tread surface, distributing contact forces along the curved path rather than at discrete points. This curved engagement prevents sliding and maintains synchronization while accommodating the toroidal shape.
Solution Approach 2:
The patent replaces traditional friction-based friction drive mechanisms with positive engagement gear systems. The ICS and IS gears provide tooth-to-tooth mechanical engagement with the tread, eliminating reliance on friction and preventing sliding against external walls through direct mechanical coupling.
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
These configurations enable efficient and low-friction movement of toroidal vehicles by synchronizing wheel rotation, allowing for safe navigation in confined spaces without sliding against external walls, effectively addressing the mechanical connection and step-down requirements.
Implementation Method 1
a top direct current (DC) motor having a top spur gear at one end that is configured to engage the top IS gear
Implementation Method 2
a top internal curved spiral (ICS) gear configured to engage the top geared wheel; a top internal spur (IS) gear coupled to the top ICS gear
Implementation Method 3
the top DC motor configured to rotate the top spur gear that engages the top IS gear coupled to the top ICS gear to cause the top geared wheel to move rotationally in a first direction, resulting in a first inversion of the top inner device surface and the top outer device surface
Data Source
AI summary
A device fashioned in the shape of a toroid is rotated by an internal mechanism that propels itself in one or more directions based on internal rotation of the toroidal tread. In one specific example, the tread of the vehicle is self-contained and the vehicle's entire outer surface is dynamic. Such a device is uniquely and ideally suitable for exploration of a tubular structure such as, but not limited to, the alimentary tract. Because of its small size, the toroidal device is propelled by a fast-spinning DC motor that requires a novel drivetrain to spin the device's toroidal tread. The novelties described herein are related to the unique geometry and rotation of the tread in a toroidal vehicle, the configuration of a toroidal vehicle that requires that the axle of the motor to spin perpendicularly to the axis of it wheels, and the small size of internal components necessary to fit within the internal space of the toroidal tread and the overall small size of the toroidal vehicle.