Fabric-Reinforced Synchronous Belt Teeth for Higher Load Capacity
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Solution Overview
Problem
Existing synchronous belts face challenges in achieving sufficient tooth stiffness, which affects load capacity and timing accuracy, and are often difficult to manufacture due to issues with fiber-loaded compounds and viscosity increases.
Innovation Solution
The implementation of a synchronous belt design with a tensile member embedded in an elastomeric body, featuring teeth stiffened with multiple fabric insert layers separated by elastomer composition, oriented in various directions to enhance stiffness without compromising the pitch line location.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If fabric reinforcement layers are added to increase tooth stiffness, then load capacity increases, but manufacturing complexity increases
Solution Approach 1:
The tooth structure is segmented into multiple functional layers: tensile member layer, elastomeric body, multiple fabric insert layers within teeth, and jacket layer. Each layer performs a specific function, with fabric inserts placed at strategic locations within teeth to provide reinforcement without requiring complex preforming of entire tooth structures.
Solution Approach 2:
Fabric inserts are placed locally within the tooth regions only, separated by elastomer composition, rather than using continuous fabric layers throughout the entire belt. This localized reinforcement provides the necessary stiffness where needed while simplifying manufacturing compared to full preforming approaches.
2Measurement precision
If multiple fabric insert layers are used to stiffen teeth, then timing accuracy improves, but manufacturing difficulty increases
Solution Approach 1:
The fabric inserts are pre-positioned within the tooth regions of the elastomeric body before final curing. This preliminary placement ensures proper positioning for timing accuracy while avoiding the complexity of preforming entire tooth structures with multiple fabric layers in a mold.
Solution Approach 2:
The elastomer composition acts as an intermediary material that separates and embeds the fabric insert layers within the teeth. This intermediary matrix simplifies manufacturing by allowing fabric inserts to be embedded without requiring complex preforming operations, while still achieving the desired timing accuracy through proper insert placement.
3Strength
If fabric inserts are placed close to the pitch line to maximize stiffness, then load capacity increases, but pitch line location control becomes difficult
Solution Approach 1:
Fabric inserts are placed locally within the tooth regions at optimized positions that balance stiffness enhancement with pitch line control. The inserts are positioned to provide maximum bending stiffness where needed while maintaining adequate spacing from the pitch line to avoid interfering with pitch line location control during manufacturing.
Solution Approach 2:
The design optimizes the spacing and positioning parameters of fabric inserts relative to the pitch line. By carefully controlling the distance and orientation of inserts from the pitch line, the design achieves enhanced load capacity while maintaining manufacturable pitch line location control through adjusted geometric parameters.
Data Source
AI summary
A synchronous belt with a tensile member layer having a tensile member embedded in an elastomeric body; a toothed surface with a plurality of regularly spaced, transverse teeth protruding from the body; and a jacket covering the toothed surface; wherein the teeth comprise a plurality of fabric insert layers that increase the stiffness of the tooth, the insert layers separated from each other by layers of an elastomer composition. The layers may be oriented parallel to the tensile member layer, perpendicular to the tensile member, or following the contour of the tooth. The layers may be a single piece of fabric folded into layers, or separate pieces of fabric.