Asymmetric Brake Disc Geometry for Rope Brakes With Weight Differences
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Solution Overview
Problem
Existing rope brakes struggle to effectively stop climbers with significant weight differences during a fall, as the friction mechanism is insufficient to manage the energy dissipation and reduce acceleration on the belayer.
Innovation Solution
A brake disc with non-circular arcs of varying radii is used, enhancing the lever arm and rope wrap angle, allowing faster engagement and increased friction to manage greater weight differences and reduce belayer acceleration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a circular brake disc is used, then the structure is simple and easy to manufacture, but the friction mechanism is insufficient to manage large weight differences during a fall
Solution Approach 1:
The brake disc transitions from a symmetric circular shape to an asymmetric design with multiple sections of different radii. The first section has a first radius, the second section has a second radius greater than the first, and the third section has a third radius smaller than the first, creating an asymmetric profile that optimizes friction engagement for different phases of rope braking during falls with weight differences
Solution Approach 2:
The brake disc is divided into three distinct sections (first, second, and third sections) with different radii, where each section serves a specific function in the rope braking process. This segmentation allows different parts of the disc to engage the rope at different radii, creating varied friction characteristics throughout the braking sequence
2Loss of energy
If the rope wrap angle is increased to improve friction, then the energy dissipation improves, but the lever arm is reduced
Solution Approach 1:
The invention resolves the trade-off by introducing a multi-dimensional approach with sections of varying radii. By engaging the rope at different radial distances from the center in different sections, the system can simultaneously achieve large wrap angles for energy dissipation and maintain effective lever arms for mechanical advantage, as each section operates in its own dimensional context
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 brake disc design improves energy dissipation and reduces belayer acceleration by increasing friction and leverage, making falls more controllable for climbers of varying weights.
Implementation Method 1
the friction in the rope brake system converts the kinetic energy into heat
Implementation Method 2
The rope brake rotates via the normal force between the brake disc 12 or control disc 13 and the rope 50
Data Source
Figure 1A~1C
Figure 2
Figure 3
AI summary
The invention described herein relates to a brake disc for a rope brake for rope climbing, the brake disc comprising: a first section for supporting a rope on the brake disc, wherein the first section is a first arc of a first circle with a first radius; and a second section for supporting the rope on the brake disc, wherein the second section is arranged adjacent to the first section; wherein the brake disc is characterized in that the second section is a second arc of a second circle with a second radius, the second radius being larger than the first radius. The invention further relates to a rope brake for rope climbing with the brake disc and a method for retrofitting a rope brake with the brake disc.