Textured Pulley Belt Surface for Detachment Wave Suppression
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Solution Overview
Problem
Detachment waves in pulley belt systems lead to self-oscillation and energy losses due to uncontrollable surface behavior and frictional interactions, with existing methods being time-consuming, costly, and environmentally unfriendly.
Innovation Solution
A pulley belt with a contact surface featuring a regularly patterned plurality of projections extending from it, having an area density of at least 70% and a height/diameter aspect ratio of 0.2, which inhibits the formation of detachment waves by locally decoupling contact surfaces, reducing the propagation of Schallamach waves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chemical modification methods (strong acids, chlorinating agents, plasma treatments, laser cladding) are used to inhibit detachment waves, then the belt surface adhesion is improved, but the manufacturing time, cost, and environmental impact increase significantly
Solution Approach 1:
The patent changes the physical parameters of the belt surface by introducing geometric projections with specific height (0.05-0.5mm) and area density (10-90%) characteristics. This geometric parameter modification achieves detachment wave inhibition without requiring chemical treatments, thereby reducing manufacturing time and avoiding environmental issues associated with strong acids and plasma treatments.
Solution Approach 2:
The patent employs a simple geometric surface modification that can be integrated into standard molding processes, replacing expensive and time-consuming chemical modification methods. The projection pattern is created through conventional molding techniques, making the solution cost-effective and environmentally friendly while maintaining reliability.
2Reliability
If chemical modification methods are used to introduce functional groups on elastomeric surface, then adhesion is improved, but the manufacturing cost and environmental friendliness deteriorate
Solution Approach 1:
Instead of chemical parameter changes (introducing functional groups), the patent employs geometric parameter changes (projections with specific dimensions and density). This physical modification achieves the same adhesion improvement effect at lower cost and without environmental harm, as it uses conventional molding rather than expensive chemical treatments.
Solution Approach 2:
The geometric projection pattern replaces expensive chemical modification processes. The projections are created through standard molding operations already present in belt manufacturing, eliminating the need for separate chemical treatment steps and reducing overall manufacturing cost while maintaining surface adhesion.
3Reliability
If coating methods (plasma polymerized coating, laser cladding) are used on elastomer substrates, then surface properties are improved, but the manufacturing complexity and cost increase
Solution Approach 1:
The patent modifies surface properties through geometric parameter changes (projections) rather than adding coating layers. This approach integrates the modification into the base belt structure itself, eliminating the need for separate coating processes and reducing manufacturing process complexity while improving surface properties for detachment wave inhibition.
Solution Approach 2:
The patent merges the surface modification function with the base belt structure by creating projections as an integral part of the belt during standard molding. This eliminates the need for separate coating processes (plasma polymerization, laser cladding) and simplifies the manufacturing process while achieving the desired surface properties.
4Reliability
If strong adhesion coating is applied to elastomeric belt surface, then detachment wave inhibition is improved, but the manufacturing time and cost increase
Solution Approach 1:
The patent achieves detachment wave inhibition through geometric parameter modification (projections) rather than applying adhesion coatings. This modification is integrated into the belt molding process itself, requiring no additional manufacturing steps and maintaining high productivity while improving reliability.
Solution Approach 2:
The surface modification is merged with the base belt manufacturing process. The projections are formed during standard molding operations, combining the belt fabrication and surface modification into a single process step, thereby maintaining manufacturing efficiency and productivity without requiring separate coating applications.
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 significantly reduces self-oscillation and energy losses by minimizing detachment waves, with a more pronounced effect in the driver case, and maintains the belt's tractive abilities while ensuring steady operation of the pulley system.
Implementation Method 1
Detachment waves have been identified as one of the main sources for self-oscillation and accompanying energy losses in belt drive systems
Implementation Method 2
a tangentially loaded elastomeric surface tends to buckle under compression, forming narrow lines of lost contact called 'Schallamach waves,' which propagate across the interface
Implementation Method 3
Frictional interactions in both sliding and rolling elastomeric contacts are significantly affected by adhesion
Implementation Method 4
Frictional interactions in both sliding and rolling elastomeric contacts are significantly affected by adhesion
Data Source
AI summary
A pulley belt (100) for transmitting force from a first pulley (12) to a second pulley (14) includes a belt member (110) having a contact surface (120) configured to be in contact with the first pulley (12) and the second pulley (14). A plurality of projections (122) extends from the contact surface (120). The projections have a predetermined height/diameter aspect ratio. In a method of making a pulley belt, an uncured elastomer (316) is placed in a mold (310) having a shape of a belt member (320) with an inner surface from which patterned projections (312) extend inwardly. The uncured elastomer is cured to form a cured belt member (320), which is removed from the mold (310).