Boss Anti-Slip Surface With Crater Chains for Torque and Radial Grip
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Solution Overview
Problem
Existing methods for forming anti-slip surfaces on rotating members, such as shot peening and laser processing, fail to create effective protrusions that dig into opposing surfaces, leading to insufficient slip prevention in the radial direction due to direction-dependent anti-slip effects and high production costs.
Innovation Solution
A rotating member with a boss featuring crater-like depressions and serially arranged peripheral protrusions formed by punching, which creates crater chains that provide enhanced slip prevention in both torque and radial directions, using a simple and cost-effective method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If shot peening is used to roughen the surface, then the frictional coefficient is increased, but protrusions that dig into the opposing surface cannot be formed
Solution Approach 1:
The patent replaces the mechanical shot peening process with a laser-based energy field approach. The laser beam melts and vaporizes material to create crater-like depressions with protrusions, substituting a mechanical impact system with an optical-energy system that achieves both surface roughening and protrusion formation simultaneously.
Solution Approach 2:
The patent utilizes phase transitions of material (solid to liquid to vapor) through laser heating. The laser beam rapidly heats the surface material, causing melting and subsequent vaporization, which forms the crater-like depressions and protrusions. This phase transition approach enables both friction increase and diggable protrusion creation in one process.
2Shape
If laser processing is used to form protrusions, then protrusions that dig into the opposing surface are formed, but the production cost increases due to expensive equipment and precise parameter adjustment requirements
Solution Approach 1:
The patent optimizes laser processing parameters (power, pulse duration, scanning speed) to achieve effective protrusion formation while reducing equipment requirements. By finding the optimal parameter range, the process becomes less sensitive to precise adjustments, lowering operational complexity and cost while maintaining effective protrusion creation for anti-slip functionality.
3Shape
If laser processing is used to form grooves, then protrusions are formed, but the groove width is extremely small which limits the anti-slip effect in the direction parallel to the grooves
Solution Approach 1:
The patent segments the groove structure into multiple crater-like depressions along the groove path, each creating its own set of protrusions. This segmentation increases the total number of protrusions and their cumulative width, enhancing the anti-slip effect in the direction parallel to the grooves while maintaining the overall groove structure for torque-direction prevention.
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 punching method ensures protrusions with sharp tips that dig into the opposing surface uniformly, increasing anti-slip effects in all directions, reducing direction-dependent reductions and enhancing slip prevention, while being cost-effective and applicable with standard equipment.
Implementation Method 1
forming a plurality of crater-like depressions each having a peripheral protrusion on the anti-slip surface by punching
Data Source
AI summary
To provide a rotating member that allows formation of protrusions to be dug into an opposite surface with a simple configuration, and that can prevent a direction-dependent reduction of anti-slip effect and provide sufficient slip prevention in the direction of torque as well as in the radial direction, and a method of forming this rotating member. The rotating member has a boss and an anti-slip surface on at least one of both axial end faces of the boss. The anti-slip surface includes a plurality of crater-like depressions each having a peripheral protrusion. At least some of the plurality of crater-like depressions are arranged serially to form a plurality of crater chains.