Load-Reactive Cargo Roller Braking for Skid-Free Light Loads
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Solution Overview
Problem
Existing braking mechanisms for cargo rollers are too powerful for light loads, causing containers to skid and create flat spots, and fail to provide proportional braking force based on the load applied.
Innovation Solution
A roller assembly with an internal braking mechanism that increases braking force in response to the mass of the cargo, using a spring-like axle assembly and brake arrangement that applies proportional braking force based on the load, ensuring efficient rolling under varying load conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If strong brakes are preset at maximum braking load, then braking effectiveness for heavy loads is improved, but the roller cannot roll under light loads
Solution Approach 1:
The braking mechanism transitions from a static preset brake to a dynamic load-responsive system. The spring assembly and friction material automatically adjust braking force based on the applied load, allowing the roller to be easily moved under light loads while providing strong braking for heavy loads.
Solution Approach 2:
The braking force parameter is changed from a fixed maximum value to a variable value that responds to load conditions. The spring assembly compresses under load, increasing the normal force on the friction material, thereby dynamically adjusting braking force proportionally to the applied load.
2Reliability
If preset braking mechanism is used, then braking reliability for maximum load is improved, but skidding occurs under light loads causing flat spots
Solution Approach 1:
The braking mechanism serves itself by automatically adjusting to the appropriate braking force based on the load. The spring assembly self-regulates the pressure on the friction material, eliminating the need for external control systems and preventing skidding under light loads while maintaining reliability for heavy loads.
Solution Approach 2:
The system incorporates mechanical feedback through the spring assembly that responds to the applied load. As the load increases, the spring compresses and increases braking force; as the load decreases, the spring expands and reduces braking force, creating a self-regulating feedback loop that prevents skidding.
3Force
If friction material is placed around the outer surface, then braking capability is improved, but flat spots are created under insufficient load
Solution Approach 1:
The contact pressure parameter between the friction material and roller surface is dynamically changed based on load conditions. The spring assembly ensures that sufficient normal force is applied to the friction material only when needed, preventing excessive wear and flat spot formation on the roller surface while maintaining braking 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
The solution provides a braking force that is linearly proportional to the load, preventing skidding and maintaining efficient cargo movement across varying load conditions, thus protecting the rollers and ensuring smooth operation.
Implementation Method 1
a spring assembly positioned within the housing and configured to apply a compressive force to the brake arrangement in response to a load applied against an outer surface of the roller
Implementation Method 2
The brake arrangement may include a first brake surface and a second brake surface, wherein the first brake surface is coupled to the first axle and the second brake surface is coupled to the second axle
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
A roller assembly for a cargo loading system, comprises: a roller having an outer surface; a housing (204) radially inward from the outer surface; a first side plate (122); a second side plate (124) disposed opposite the first side plate, the roller disposed between the first side plate and the second side plate; a first tension strap (126) extending from the first side plate and the second side plate, the roller disposed adjacent to the first tension strap; a brake arrangement (240) retained within the housing; and an axle assembly (210) disposed at least partially within the housing, the axle assembly configured to apply a compressive force to the brake arrangement.