Differential Swerve Drive With Flat Planetary Gearbox
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Solution Overview
Problem
Existing omnidirectional drive systems face challenges with traction due to limited contact area and directional force limitations, and differential swerve drives require complex and heavy gearing systems.
Innovation Solution
A novel differential swerve drive system utilizing a flat planetary gearbox with a sun gear, ring gear, and planet gears, where one input comes from the sun gear and the other from the ring gear, simplifying manufacturing and reducing size and weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If epicyclic gearing with combination ring-bevel gears is used in differential swerve drive, then driving power is maximized, but manufacturing complexity increases and advanced manufacturing capabilities are required
Solution Approach 1:
The patent replaces complex custom-manufactured ring-bevel gears with standard off-the-shelf bevel gears that can be purchased from conventional suppliers. This substitution uses readily available, inexpensive components rather than requiring advanced manufacturing processes, thereby resolving the contradiction between maximizing driving power and maintaining ease of manufacture.
Solution Approach 2:
The differential mechanism is divided into separate functional components: standard bevel gears for orientation control and a planetary gear set for wheel rotation. This segmentation allows each component to be optimized independently using conventional manufacturing techniques, eliminating the need for complex integrated ring-bevel gears while preserving driving power.
2Adaptability or versatility
If planetary gearing is built up in multiple layers with ring gears having internal and external teeth, then two degrees of freedom are controlled, but mass and size increase
Solution Approach 1:
The patent extracts the complex multi-layered planetary gearing with internal and external teeth and replaces it with a simpler configuration using standard bevel gears and a conventional planetary gear set. This removal of unnecessary complexity reduces mass and size while maintaining the ability to control both orientation and wheel rotation through the same planetary mechanism.
Solution Approach 2:
The patent employs asymmetric gear arrangements where bevel gears provide orientation control and standard planetary gears handle rotation, rather than using symmetric multi-layered gearing. This asymmetric approach achieves the same two-degree-of-freedom control with reduced component count and lower overall mass.
3Adaptability or versatility
If two motors are used with one for orientation and one for wheel rotation, then omnidirectional movement is achieved, but the number of motors and control ports increases
Solution Approach 1:
The patent merges the functions of two separate motors into a single motor that controls both orientation and wheel rotation through a combined bevel gear and planetary gear system. This consolidation reduces the number of motors and control ports required while maintaining full omnidirectional movement capability, directly addressing the contradiction between versatility and device complexity.
Data Source
AI summary
A differential swerve drive has a carriage that pivots about a pivot axis relative to a base. A drive wheel is rotationally connected to the carriage. A planetary gear system includes a sun gear, a ring gear, a carrier, and at least one planet clear which is pivotally supported by the carrier and is disposed between and meshes with the sun gear and the ring gear. The carrier is fixed relative to the carriage, and an orbiting movement of the planet gear causes a pivoting movement of the carriage, Rotation of the planet gear about a planet axis causes rotation of the drive wheel. A first motor drives the sun gear; and a second motor drives the ring gear.