Protrusion Timing Belt Structure for Small-Pulley Coin Conveyors
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Solution Overview
Problem
Conventional coin conveying mechanisms face challenges in space-saving designs due to increased deformation stress and bending fatigue when using belts with protrusions, which leads to belt breakage and inadequate resistance against loads during locking, especially when pulley diameters are reduced and belt widths are narrowed.
Innovation Solution
A coin conveying mechanism featuring a belt with a protrusion, where the cord fineness is between 999.9 × 10^-7 and 1222.1 × 10^-7 kg/m, and a ratio of total intervals between cords to belt width is between 12 to 45%, with a protruding portion hardness of 81 to 91 degrees and a base width smaller than the tooth pitch, ensuring balanced bending fatigue resistance and resistance against loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the pulley diameter is decreased for space-saving, then the conveying mechanism becomes more compact, but the deformation stress on the belt increases and bending fatigue resistance deteriorates
Solution Approach 1:
The patent changes the physical parameters of the cord material by specifying a fineness range (999.9-1222.1 × 10^-7 kg/m) to optimize the balance between bending flexibility and strength. This parameter adjustment allows the belt to withstand repeated bending on smaller pulleys while maintaining sufficient load-bearing capacity.
Solution Approach 2:
The belt is constructed as a composite structure with a polyurethane matrix and embedded cords. This composite design combines the flexibility and damping properties of polyurethane with the tensile strength of the cords, enabling the belt to resist bending fatigue on small-diameter pulleys while maintaining structural integrity.
2Force
If the protrusion size is increased to resist locking loads, then the load resistance improves, but the bending fatigue of the cord becomes more remarkable
Solution Approach 1:
The patent optimizes the protrusion dimensions by setting the base width to be smaller than the tooth pitch, creating an optimal geometric parameter that distributes stress during locking events. This parameter optimization reduces stress concentration on the cords while maintaining sufficient protrusion strength for load resistance.
Solution Approach 2:
The belt structure exhibits local quality differentiation with protrusions having different hardness (81-91 degrees) than the base belt material. This localized hardness variation allows the protrusions to withstand locking loads while the softer base material and cords maintain flexibility and resist bending fatigue.
3Strength
If the cord fineness is decreased to improve bending fatigue resistance, then the bending flexibility improves, but the elastic modulus of the belt decreases and jumping occurs
Solution Approach 1:
The patent precisely controls the cord fineness within a specific range (999.9-1222.1 × 10^-7 kg/m) to achieve the optimal balance between bending flexibility and elastic modulus. This parameter optimization ensures the belt can bend repeatedly without fatigue while maintaining sufficient stiffness to prevent tooth jumping during operation.
Data Source
Figure 1~1(b)
Figure 2~2(c)
Figure 3
AI summary
The present invention pertains to a belt having a protrusion formed thereon, the belt comprising : a belt body which has teeth parts formed, at a predetermined tooth pitch, in the longitudinal direction on the inner surface of the belt, and in which core wires extending in the longitudinal direction and arranged at a predetermined core wire pitch in the width direction are embedded in the back part; and protrusion parts integrally formed on the rear surface of the belt body, the belt having protrusions formed thereon being characterized in that: the fineness of the core wires is 900-1,100 denier; the ratio of the sum of the gaps between neighboring core wires to the belt width is 12-45%; the protrusion parts are disposed on the outside of the teeth parts; the hardness of the protrusion parts is 81-91 degrees (as measured by means of an A-type hardness meter according to JIS K6253:2012); and the root widths of the protrusion parts are smaller than the tooth pitch.