Belt Zero Tension Line Shift for Fiber Compression
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Solution Overview
Problem
Existing road train systems with compression-sensitive fibers experience a relatively low belt life, posing safety risks in applications like passenger elevator systems due to compressive stress on fibers during curvature, which impairs stability and safety.
Innovation Solution
The system shifts the zero tension line radially inward by at least 25% of the fiber structure's thickness in the curved section by adapting the belt's dimensioning and tensile load, minimizing compressive stress on fibers and ensuring most are under tensile stress, thereby increasing belt life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the belt is curved around a deflection device, then the belt can be guided to transmit load, but compressive stress acts on the inner fibers reducing belt life
Solution Approach 1:
The invention changes the geometric parameters of the belt cross-section, specifically making the fibrous structure asymmetrically distributed within the belt thickness. The fibrous structure is positioned closer to the inner curvature side, which shifts the neutral axis and reduces the compressive stress zone on the fibers during bending, thereby extending belt life while maintaining guidance functionality
Solution Approach 2:
The invention uses a composite structure consisting of a matrix material and embedded compression-resistant fibers (such as carbon fibers) in the region subjected to compressive stress. This composite design allows the belt to withstand compressive loads during curvature without damaging the tension-bearing fibers, thus maintaining belt life while enabling proper guidance around deflection devices
2Strength
If compression-resistant fibers are used to increase tensile strength, then the belt can bear higher loads, but the fibers are sensitive to compression and become kinked
Solution Approach 1:
The invention modifies the spatial distribution of fibers within the belt cross-section by positioning the load-bearing fibrous structure asymmetrically, closer to the inner curvature side. This geometric parameter change ensures that during bending, the fibers remain primarily in tension or experience minimal compression, preventing kinking and maintaining both tensile strength and reliability
Solution Approach 2:
The invention applies different material properties to different regions of the belt cross-section. The inner region (closer to the curvature center) contains the fibrous structure optimized for tension, while the outer region contains compression-resistant matrix material or compression-resistant fibers, creating a functionally graded structure that protects the tension-bearing fibers from compressive damage
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
This design significantly extends belt life by reducing compressive stress on fibers, ensuring long-term stability and safety in road train systems, particularly when using compression-sensitive fibers, while maintaining carrying capacity.
Implementation Method 1
a load-bearing fiber structure with a plurality of carbon fibers embedded in the matrix and which is guided around at least one deflection device in such a way that it has a curved section
Data Source
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AI summary
The invention relates to a load-pulling system comprising a least one belt to which a tensile load is applied, which comprises a matrix and a load-bearing fiber structure embedded in the matrix and having a plurality of fibers, and which is led around a least one deflection device in such a way that it has a curved section in the region of the deflection device, wherein the dimensioning of the belt and the applied tensile load are matched to each other in such a way that, in the curved section of the belt, a zero stress line of the belt is displaced radially inward in the direction of curvature with respect to a center line of the load-bearing fiber structure by an amount of at least 25% of the thickness of the load-bearing fiber structure.