Regenerative Steering Differential Torque Management
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Solution Overview
Problem
Conventional steering mechanisms for tracked vehicles, which rely on differential track speeds to induce turns, suffer from negative drag torque on the inner track, leading to high loadings on transmission components and the need for oversized components.
Innovation Solution
A fully geared regenerative steering differential with a gear assembly that maintains a fixed kinematic relationship between rotational velocities of torque members, allowing for differential speed output to the final drives and transferring torque directly from the inside track to the outside track without propagating drag-torque back into the primary torque members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional steering mechanisms use separate drives or clutches and brakes for each track, then differential track speeds can be achieved to induce turns, but negative drag torque is imposed on the inner track causing high loadings on transmission components
Solution Approach 1:
The patent merges the steering and driving functions into a single integrated differential mechanism. The gear assembly combines torque input from the transmission with drag-torque from the inner track to produce differential output to the left and right final drives, eliminating the need for separate steering drives or clutch-brake systems. This integration allows the inner track's drag-torque to be directly utilized to drive the outer track, resolving the technical contradiction by reducing transmission component loading while maintaining steering control.
2Adaptability or versatility
If conventional steering mechanisms use clutches and brakes to vary track speed, then turning capability is achieved, but oversized transmission components are required to handle the high loadings
Solution Approach 1:
The patent converts the harmful negative drag-torque on the inner track into a beneficial driving force for the outer track. The gear assembly captures the drag-torque from the inner track during turning and uses it to drive the outer track, transforming what was previously a harmful load into a useful power source. This eliminates the need for oversized transmission components while maintaining full turning capability across various operating conditions.
3Ease of operation
If separate drives are used for each track to achieve independent speed variation, then steering is enabled, but the system complexity increases with additional drives
Solution Approach 1:
The patent creates a universal differential mechanism that performs multiple functions simultaneously: it transmits driving torque from the transmission, captures drag-torque from the inner track during steering, and distributes the combined torque to both final drives with differential speeds. This single multi-functional mechanism replaces what would otherwise require separate steering and driving systems, reducing overall system complexity while maintaining independent track speed control capability.
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 solution reduces the load on transmission components by directly translating drag-torque from the inside track to the outside track, enhancing steering efficiency and reducing the need for oversized components, while maintaining precise control over turning radii and track speed ratios.
Implementation Method 1
The gear assembly includes a primary gear set and a plurality of secondary gear sets that are coupled to the primary gear set. The primary gear set is coupled to a first of the torque members and to a second of the torque members and is configured to transfer torque between the secondary gear sets and the first and second torque members
Data Source
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AI summary
A regenerative differential includes torque members, and a gear assembly that includes a primary gear set and a plurality of secondary gear sets. The primary gear set is configured to transfer torque between the secondary gear sets and first and second torque members. The first secondary gear set transfers torque between the primary gear set and a third torque member. The second secondary gear set transfers torque between the primary gear set and a fourth torque member. The gear assembly is configured to maintain a fixed relationship between torque member rotation velocities ω 1 , ω 2 , ω 3 , and ω 4 , such that ω 3 = M L ω 2 + Δ L ω 1 , ω 4 = M R ω 2 + Δ R ω 1 , M L and Δ L are functions of a ratio of the first secondary gear set, and M R and Δ R are functions of k R of a ratio of the second secondary gear set.