Closed-Looped Belt Coupling with Interlocking Profiles
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Solution Overview
Problem
Existing closed-looped toothed belts are weak in the coupling region due to cutting and heat sealing, making them susceptible to breaking under traction efforts during transport and power transmission.
Innovation Solution
The method involves shaping the belt ends with complementary profiles that can be securely restrained orthogonal to their surface, using thermoplastic melting to fix them, and employing small blocks and false teeth for additional stability, creating a resistant force against longitudinal and transverse stresses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the belt ends are cut and heat sealed to form a closed loop, then the belt can be assembled into a loop structure, but the coupling region becomes weak and susceptible to breaking under traction efforts
Solution Approach 1:
The coupling profile is segmented into multiple interlocking teeth and grooves rather than a single continuous joint. This segmentation distributes the traction load across multiple contact points, preventing stress concentration at any single point and significantly improving the strength of the coupling region while maintaining the closed-loop structure
Solution Approach 2:
The coupling region employs a composite structure combining rigid interlocking teeth/grooves for structural strength with thermoplastic material for bonding. This composite approach allows the rigid elements to bear mechanical loads while the thermoplastic provides additional bonding strength, resolving the contradiction between ease of assembly and coupling strength
2Ease of manufacture
If stiffening cables are cut during belt manufacturing, then the belt can be formed into a loop, but the cables are weakened at the coupling region
Solution Approach 1:
The cable ends are预先 treated with adhesive application before the final coupling assembly. This preliminary action ensures that when the cable is cut and the belt is formed into a loop, the adhesive is already in position to bond the cable ends together, maintaining cable integrity throughout the manufacturing process without requiring complex post-assembly operations
Solution Approach 2:
Adhesive is introduced as an intermediary substance between the cable ends during coupling. This intermediary material bridges the gap created by cutting the cable, providing continuous structural support and maintaining cable integrity while allowing the belt to be formed into a closed loop structure
3Device complexity
If simple heat sealing is used to join belt ends, then the manufacturing process is simple, but the joint has low resistance to traction efforts
Solution Approach 1:
The joining process merges multiple functions into a single integrated operation: the interlocking teeth and grooves provide mechanical engagement while the thermoplastic material simultaneously provides bonding and sealing. This merged approach achieves high traction resistance without requiring separate complex joining operations, maintaining process simplicity while improving force resistance
Solution Approach 2:
The joint structure uses composite materials combining rigid interlocking features for mechanical strength with thermoplastic material for bonding. This composite construction provides superior traction resistance compared to simple heat sealing alone, while the integration of these elements in a single coupling operation maintains manufacturing simplicity
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 method enhances the resistance of the closed-looped belt to traction efforts, ensuring stability during operation and maintaining the belt's integrity when wrapped around pulleys, while keeping realization costs low.
Implementation Method 1
fixing the ends with respect to each other, in particular by means of a local melting of a thermoplastic material
Implementation Method 2
heat sealing the die cut ends
Data Source
Figure 1~2
Figure 3~4
Figure 5~15
AI summary
Belt piece, of the type which can be closed as a loop and usable for the transport of articles and/or for power transmissions, which comprises a central body (80) and two restrainable ends (2), (3), which: extend in parallel to the longitudinal axis of the belt piece (1); have transverse dimensions smaller than the ones of the central body (80); and at longitudinal sides (81), (82) have complementary coupling profiles (4), (5) comprising a plurality of first (6) and second portions (7). These portions are arranged in mutual contact when the ends (2), (3) are coupled and press the one against the other in case a longitudinal traction effort is applied to the belt piece (1), closed as a loop, to prevent the ends (2, 3) from sliding in longitudinal direction. It is further disclosed a method for obtaining a closed looped belt which uses a belt piece (1), comprising the steps of: approaching the ends (2), (3) according to a direction orthogonal to the extension one of the belt piece (1), until they are restrained; and fixing the ends (2), (3) with respect to each other by means of melting thermoplastic material or by applying small blocks.