Low-Height Differential Drive Structure for AGV Rotation
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Solution Overview
Problem
The existing differential drive devices for automated guided vehicles (AGVs) are limited by their high height due to the use of slewing bearings, which restricts their application in spaces with height constraints.
Innovation Solution
A differential drive device design that replaces the slewing bearing with a top plate and outer cover configuration, incorporating rolling members to facilitate rotation and reduce friction, allowing the differential drive unit to rotate relative to the top plate and outer cover, thereby reducing the overall height and improving stability and motion accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a sleving bearing is used to realize rotation connection between the differential drive device and the vehicle body, then the rotation function is achieved, but the total height of the differential drive device becomes relatively large
Solution Approach 1:
The patent changes the spatial arrangement from a vertical configuration (sleving bearing occupying vertical height) to a horizontal configuration (rolling members arranged radially around the central axis). The rolling members are positioned at different angular positions around the central axis, converting the vertical height problem into a horizontal radius problem, thereby reducing the total height of the differential drive device while maintaining the rotation function.
Solution Approach 2:
The patent uses multiple rolling members (at least two) distributed around the central axis to replicate the rotation support function that would otherwise require a single sleving bearing. Each rolling member independently supports the rotating platform, and their combined effect achieves the same rotation function as a sleving bearing but with reduced vertical height requirement.
2Length of stationary object
If rolling members are used to replace sleving bearing, then the height is reduced, but the friction and wear increase
Solution Approach 1:
The patent replaces the sliding friction mechanism of a sleving bearing with a rolling friction mechanism using rolling members. The rolling members rotate on their axes while supporting the rotating platform, converting sliding friction into rolling friction. This substitution significantly reduces friction and wear compared to traditional sleving bearings, addressing the harmful effects while maintaining the height reduction benefit.
3Manufacturing precision
If the differential drive unit rotates relative to the top plate and outer cover, then motion accuracy is improved, but the structural complexity increases
Solution Approach 1:
The patent segments the rotation support function into multiple independent rolling members rather than using a single integrated sleving bearing. Each rolling member is a simple, standardized component that can be independently manufactured and assembled. This segmentation approach improves motion accuracy through better load distribution and reduced friction, while the modular nature of individual rolling members actually simplifies manufacturing and assembly compared to a complex sleving bearing.
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
The solution effectively reduces the total height of the differential drive device, enhances stability, and improves motion accuracy by reducing friction and wear, while maintaining the functionality of differential rotation and forward/backward walking.
Implementation Method 1
a first rolling member is provided on a side of the differential drive unit. The first rolling member is in rolling connection with the lower side of the top plate
Data Source
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AI summary
The present application discloses a differential drive device applied to an AGV, relating to the field of wheeled drivers, and being able to effectively reduce the total height of the differential drive device. The differential drive device includes a differential drive unit (2), a top plate (1) and an outer cover (3). The top plate (1) is installed on a top end of the outer cover (3). The differential drive unit (2) is located in the outer cover (3) at a lower side of the top plate (1). The top plate (1) is supported on the differential drive unit (2). An inner side wall of the outer cover (3) is circular-shaped. The present application applies to apparatuses with transportation functions.