Asymmetrical Steering Differential for Simpler Skid-Steer Control
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Solution Overview
Problem
Existing double differential steering systems for skid-steered vehicles are complex, require custom transmission parts, and are difficult to customize for specific applications, making them challenging to maintain and produce in lower volumes.
Innovation Solution
A steering system comprising a variable-speed steering power input device and an asymmetrical steering differential with a rotatable planetary reducer and a fixed planetary reducer, allowing for simple design, use of standard transmission parts, and easy configuration across various vehicle types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If double differential steering systems are used for skid-steered vehicles, then steering precision and efficiency are improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The steering system is divided into separate functional modules: a steering motor, a differential mechanism with planetary gearsets, and connection shafts to the wheels. This segmentation allows each component to be optimized independently and simplifies manufacturing and maintenance while maintaining precise steering control through the coordinated operation of these modular elements
Solution Approach 2:
A differential mechanism acts as an intermediary between the single steering motor and the two wheels. The planetary gearsets within the differential mechanism distribute and differentiate the power from the single motor to create the speed differential between left and right wheels, enabling precise steering without requiring two separate motors
2Measurement precision
If custom transmission parts are used in steering systems, then steering performance is optimized, but ease of manufacture and adaptability decrease
Solution Approach 1:
The differential mechanism with planetary gearsets serves multiple functions: it acts as a power distributor from the single motor, creates the speed differential for steering, and provides mechanical advantage through gear reduction. This multi-functionality eliminates the need for custom-designed specialized components while achieving optimized steering performance through a standardized differential mechanism
Solution Approach 2:
The planetary gearsets allow for parameter changes in speed and torque distribution to the wheels. By adjusting the gear ratios and the engagement of the differential mechanism, the system can optimize steering performance for different operating conditions without requiring custom transmission parts, simply by changing operational parameters
3Speed
If complex custom gearboxes are used, then high-speed operation capability is achieved, but device complexity and maintenance difficulty increase
Solution Approach 1:
The steering motor is extracted as a separate, independent component from the wheel drive system. This allows the steering motor to be optimized for high-speed rotational output without being constrained by complex gearbox designs. The differential mechanism then takes this high-speed rotation and distributes it to the wheels, achieving high-speed operation capability while keeping the overall system simpler through this separation of functions
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 proposed steering system provides smooth steering, reduces complexity and customization needs, and is easier to maintain, while allowing for point turns and high-speed operations without the need for complex custom gearboxes.
Implementation Method 1
The steering system can involve a steering motor and planetary gearsets that transform steering input into wheel rotation
Data Source
AI summary
A steering system for a skid steered vehicle has a variable-speed steering motor, and an asymmetrical steering differential operatively connected to the steering motor and rotatably mounted on a first side of the chassis separately from the propulsion system. The steering differential has a first differential shaft and a second differential shaft, where the asymmetrical differential imparts a greater speed change on the second differential shaft than the first differential shaft. The first differential shaft is connected to a first steering output shaft operatively connected to at least one ground-engaging element on the first side of the vehicle. A speed reducer connecting the second differential shaft to a second steering output shaft operatively connected to at least one ground-engaging element on the second side of the vehicle so that the second steering output shaft experiences the same speed change but in an opposite rotational direction as the first steering output shaft.