Cogged Flexible Transmission Pulley System for Slippage Reduction
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Solution Overview
Problem
Cogged belt transmission systems experience irregular advancement due to play between pulleys and cogs, leading to slippage and wear, especially in conveyor applications where the interaxis between pulleys is large and tolerances vary.
Innovation Solution
A device comprising support pulleys and a drawing pulley, where the support pulleys have calibrated circumferences to contact the tops of cogs and define a predetermined winding radius, while the drawing pulley's cogs are sized to enmesh with recesses without top-to-bottom displacement, eliminating play and slippage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single cogged pulley is used with tolerance-based fitting, then the device complexity is low, but the advancement irregularity and slippage increase due to play between cogs and recesses
Solution Approach 1:
The drive pulley is segmented into two distinct components: a support pulley that defines the winding radius and a drawing pulley that provides positive engagement through cogs. This segmentation allows each component to specialize in its function, eliminating the play and slippage issues that occur in single-pulley systems while maintaining reasonable complexity.
Solution Approach 2:
The support pulley acts as an intermediary element between the drive shaft and the flexible transmission organ. It provides a calibrated circumference that defines the winding radius and positions the organ correctly, while the drawing pulley's cogs provide the actual driving force. This intermediary structure resolves the contradiction by separating the positioning function from the driving function.
2Adaptability or versatility
If the interaxis between pulleys is increased for longer transmission organs, then the adaptability increases, but the slippage and play effects are amplified
Solution Approach 1:
By segmenting the pulley into support and drawing components, the system maintains reliable engagement even over long distances. The drawing pulley's cogs provide continuous positive engagement that prevents the cumulative slippage that would occur in longer transmission organs with single-pulley configurations.
Solution Approach 2:
The invention changes the engagement parameter from friction-based (single pulley) to positive mechanical engagement (cogged drawing pulley). This parameter change allows the system to maintain reliability regardless of the interaxis length, enabling greater adaptability for different transmission organ lengths without sacrificing engagement stability.
3Ease of manufacture
If friction-based drawing is used in contact zones, then the ease of manufacture is high, but the slippage and wear increase under load
Solution Approach 1:
The segmentation separates the friction-based support pulley (easy to manufacture) from the cogged drawing pulley (provides reliable traction). The support pulley can be manufactured simply with a calibrated circumference, while the drawing pulley adds cogged features only where needed for positive engagement, maintaining ease of manufacture for the majority of the component.
Solution Approach 2:
The drawing pulley applies local quality by adding cogs only in the specific zones where positive engagement is needed, rather than making the entire pulley complex. The rest of the pulley structure remains simple and easy to manufacture. This local application of cogged features provides reliable traction where needed while maintaining overall 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
This configuration ensures smooth, consistent advancement of the cogged flexible transmission organ, reducing wear and eliminating the clicking effect, applicable to various lengths and types of transmission organs, including conveyor belts.
Implementation Method 1
at least a support pulley borne idle on a drive shaft and destined to abut, at a calibrated circumference thereof, a top of cogs of the flexible transmission organ in order to define a predetermined winding radius of the flexible transmission organ
Implementation Method 2
at least a cogged drawing pulley, flanking the support pulley and keyed on the drive shaft and provided with cogs destined to enmesh with recesses of the flexible transmission organ in order to cause advancement of the flexible transmission organ
Implementation Method 3
the cogs of the drawing pulley being of such a size that during said enmeshing tops thereof are displaced from a bottom of the recesses of the flexible transmission organ and such that tops of cogs of the flexible transmission organ are displaced from a bottom of recesses of the drawing pulley
Data Source
AI summary
A drive transmission system for activating a cogged flexible transmission organ includes a support pulley borne idle on a drive shaft which contacts tops of the organ cogs at a calibrated circumference thereof which defines a predetermined winding radius of the flexible transmission organ. A cogged drawing pulley is mounted on the drive shaft and has cogs for enmeshing with recesses in the cogged flexible transmission organ for advancing the flexible transmission organ. The drawing pulley has cogs sized for enmeshing with the recesses of the cogged flexible transmission organ, such that tops of the drawing pulley cogs are displaced from bottoms of the drawing pulley recesses. The drawing pulley therefore cannot drag on the flexible transmission organ when the support pulley is not subject to drive torque.