Carriage Tractor Differential Drive for Stable Traverse Transfer
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Solution Overview
Problem
Conventional automatic transfer apparatuses with self-propelled vehicles face challenges in downsizing and cost reduction due to complex structures required for bidirectional movement, which complicates the steering mechanism and increases the number of drive wheels needed to maintain stability while traversing.
Innovation Solution
The solution involves a displacement restricting mechanism using a pair of carriage position holding guides and a drive wheel unit with independently rotating right and left wheels, where the direction is converted by differentiating the rotational speeds of the wheels, eliminating the need for additional steering control components and simplifying the structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the carriage tractor is configured with two drive wheel units (2WD+2WS) to enable stable bidirectional movement, then the running stability is improved, but the device complexity increases and downsizing becomes difficult
Solution Approach 1:
The drive wheel unit is segmented into independently controllable right and left wheels, allowing differential rotation for direction conversion without requiring additional steering mechanisms. This segmentation enables the single drive wheel unit to perform functions that previously required multiple wheel units.
Solution Approach 2:
The single drive wheel unit is designed to perform multiple functions: providing driving force in forward-reverse direction, enabling traverse movement through differential rotation, and maintaining running stability. This multi-functionality eliminates the need for separate steering and driving systems, reducing overall structural complexity.
2Adaptability or versatility
If additional steering control motors or sensors are added to convert drive wheel direction from forward-reverse to traverse, then the adaptability for bidirectional movement is improved, but the device complexity and cost increase
Solution Approach 1:
The drive wheel unit achieves direction conversion through self-service by differentiating the rotational speeds of its own right and left wheels, without requiring external steering control motors or angle sensors. The system uses its existing drive components to perform both driving and steering functions.
Solution Approach 2:
The direction of the drive wheel unit is changed by varying the rotational speed parameter of the wheels. By controlling the right and left wheels to rotate at different speeds, the system converts between forward-reverse and traverse directions without mechanical steering components.
3Stability of the object's composition
If the drive wheel unit is made extremely large or increased to at least two units to overcome lateral displacement force during traverse movement, then the running stability is improved, but the downsizing objective is defeated
Solution Approach 1:
The mechanical system for maintaining stability during traverse movement is replaced by controlling the rotational speeds of the drive wheels. Instead of relying on large wheel size or multiple wheel units for mechanical stability, the system uses differential rotation control to achieve stable traverse movement with a single, compact drive wheel unit.
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 enables the self-propelled transfer vehicle to run in both forward-reverse and traverse directions while simplifying and downsizing the structure, reducing the need for increased driving force and complex steering mechanisms, thus achieving efficient operation in confined spaces.
Implementation Method 1
the direction of the drive wheel unit is converted by differentiating rotational speeds of each of the wheels
Data Source
AI summary
In an automatic transfer apparatus, a carriage tractor and a carriage are respectively equipped with connecting portions and through which the carriage tractor is connected near the substantial center of the bottom of the carriage. The automatic transfer apparatus is provided with displacement restricting means for restricting lateral displacement of the carriage tractor or the carriage with respect to the running direction thereof when the carriage tractor runs in the traverse direction while towing the carriage. Therefore, the carriage tractor is capable of running in the forward-reverse direction and the traverse direction while simplifying and downsizing the structure of the carriage tractor.