Concentric Shear-Coupled Torque Limiter for Milling Drive Trains
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Solution Overview
Problem
Milling machines' drive trains are susceptible to high torque loads due to impact loading events from hard materials and buried objects, risking damage to valuable components.
Innovation Solution
A torque limiting device with a concentric arrangement of rotating elements and a shear element with a lower breaking strength than other components, which decouples and allows independent rotation when the shear element breaks, acting as a mechanical fuse to prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the drive train components are made strong to withstand high torque loads, then the strength and durability of individual components is improved, but the overall reliability of the drive train decreases due to inability to handle impact loads without catastrophic failure
Solution Approach 1:
The drive train is segmented into modular components connected by a shear element. When impact loads exceed the shear element's strength, the connection breaks, isolating the damaged section and preventing catastrophic failure of the entire drive train. This segmentation allows the system to withstand impact loads by sacrificing a non-critical component.
Solution Approach 2:
A shear element is introduced as an intermediary component between drive train components. This intermediary element has controlled breaking strength and acts as a mechanical fuse, breaking under excessive torque to protect more valuable components from damage while maintaining overall system reliability.
2Reliability
If a shear element is added to protect against high torque loads, then the reliability of the drive train is improved, but the device complexity increases due to additional components
Solution Approach 1:
The shear element is designed as a disposable, low-cost component with controlled breaking strength. It is intentionally made to fail under excessive torque loads, protecting more expensive components. After failure, it is replaced with a simple replacement operation, avoiding the need for complex protection systems.
Solution Approach 2:
The torque-limiting function is extracted as a separate, dedicated shear element rather than being integrated into the main drive train components. This extraction allows the protection mechanism to be independently designed, sized, and replaced without affecting the main drive train structure.
3Reliability
If the shear element is designed with low breaking strength to protect components, then the protection capability is improved, but the productivity decreases due to downtime for replacing the shear element
Solution Approach 1:
The shear element is designed as a simple, inexpensive, disposable component that can be quickly replaced. Its low cost and simple design minimize the impact of replacement downtime on overall productivity, while providing effective protection against catastrophic failures.
Solution Approach 2:
The shear element provides beforehand cushioning by breaking before more critical components fail. This prevents catastrophic failures that would require extensive repairs and prolonged downtime, thereby protecting productivity in the long term despite periodic replacement needs.
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 limits torque and protects drive train components by decoupling them during high torque events, preventing damage and relieving load spikes, thus extending the lifespan of the milling machine.
Implementation Method 1
a shear element extending radially between and coupled to each of the first rotating element and the second rotating element, the shear element having a lower breaking strength than other components in the drive train
Data Source
AI summary
An apparatus includes a rotating drive component for a drive train, the rotating drive component comprising a first rotating element and a second rotating element, wherein the first rotating element and the second rotating element are arranged in a concentric arrangement such that the second rotating element is positioned within the first rotating element; and a shear element extending radially between and coupled to each of the first rotating element and the second rotating element, the shear element having a lower breaking strength than other components in the drive train, wherein if the shear element breaks, the first rotating element and the second rotating element are decoupled from each other and rotate independently of each other.