Synchronous Flat Belt Drive Rolling Engagement
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Solution Overview
Problem
Synchronous flat belt drives suffer from friction losses and wear due to sliding movements between the flat belt and pulley projections, leading to inefficiency and failure, and they lack controllability and standardization for integration with existing machine elements.
Innovation Solution
A synchronous flat belt drive design featuring a frictionless force transmission through purely rolling between a flat belt with a layer construction and cylindrical engaging bodies, using a series arrangement of apertures and projections, with axial guidance to prevent friction, and a controllable connection mechanism for synchronizing rotational movements, allowing for the use of standardised gears and pulleys.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If synchronous flat belt drives use traditional friction-based transmission between flat belt and pulley projections, then force transmission is achieved, but friction losses and wear occur leading to inefficiency
Solution Approach 1:
The patent replaces the traditional friction-based mechanical transmission system with a rolling-based transmission system. Instead of relying on friction between the flat belt and pulley projections, the invention uses a series of rollers that roll between the flat belt and the pulley, substituting sliding friction with rolling motion to eliminate friction losses and wear.
Solution Approach 2:
The patent changes the fundamental parameter of motion from sliding to rolling. By introducing rollers that rotate as they move between the flat belt and pulley, the system transforms the mode of interaction from direct sliding contact to rolling contact, thereby changing the friction characteristics and eliminating the harmful effects of sliding friction.
2Productivity
If synchronous flat belt drives eliminate sliding friction by using rolling motion, then efficiency improves, but the system complexity increases due to additional rollers and guidance mechanisms
Solution Approach 1:
The patent merges the functions of multiple components into an integrated system. The rollers are designed to be simultaneously supported by the flat belt and engage with the pulley projections, combining the functions of force transmission and structural support into a single unified mechanism, thereby reducing overall system complexity despite the addition of rolling elements.
Solution Approach 2:
The flat belt serves multiple functions: it provides the upper support surface for the rollers, transmits the driving force, and maintains tension in the system. The pulley projections simultaneously engage the rollers for force transmission and guide their motion. This multi-functionality reduces the need for separate guidance mechanisms and simplifies the overall structure.
3Strength
If synchronous flat belt drives use thin flexible opposing tooth system layers, then force transmission capability improves, but the layers require precise radial positioning to prevent wedging and friction
Solution Approach 1:
The flat belt and pulley projections serve their own positioning function. The geometry of the pulley projections and the flexibility of the flat belt automatically maintain the correct radial spacing between engagement points, eliminating the need for external positioning mechanisms or high-precision manufacturing tolerances. The system self-adjusts to maintain optimal engagement conditions.
4Loss of energy
If synchronous flat belt drives achieve purely rolling movement, then friction losses are eliminated, but controllability and standardization for integration with existing machine elements are reduced
Solution Approach 1:
The patent segments the transmission system into standardized, modular components: the flat belt with its specific width and thickness dimensions, the pulley with standardized projection geometry, and the rollers with defined dimensions. This segmentation allows each component to be manufactured to standard specifications and easily integrated with existing machine elements while maintaining the rolling motion principle.
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 enables efficient, low-friction, and durable transmission of rotational motion with reduced deformation energy requirements, improved strength, and controllability, while being compatible with existing standardization systems, thus enhancing precision and reliability in applications like precision mechanics and automotive engineering.
Implementation Method 1
a frictionless force transmission through purely rolling between a flat belt with a layer construction and cylindrical engaging bodies
Data Source
AI summary
The invention relates to a synchronous flat belt drive, wherein at least one series arrangement of projections (210) has a purely rolling engagement with a series arrangement of apertures on a flat belt (100). The flat belt (100) supports on a pulley (300) only radially, and on a rotation member (200) only tangentially. The generatrix of the series arrangement of apertures is the rolling of a pulley working surface cylinder with projecting projections (210) of a rotation member (200) formed as a face gear. The flat belt (100) is formed of at least a single strip in a layer arrangement of at least one layer, wherein the ends of the individual strips are variously arranged in a layer. An individual strip forms also several layers and is also as an endless strip part of a layer arrangement.