Discrete Roller Helical Drive for Worm Engagement and Low Wear
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Solution Overview
Problem
Conventional worm drives experience significant frictional drag forces and wear due to sliding friction, which leads to power losses and material degradation, and they struggle with engagement and disengagement between the screw and nut sections.
Innovation Solution
A discrete roller assembly-based helical drive system is introduced, featuring a roller worm with discrete roller assemblies arranged in a helical pattern around a cylindrical body. This system replaces the continuous helical thread of conventional worm gears, allowing for engagement and disengagement and reducing frictional losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If sliding friction elements are used in conventional worm drives, then the structure is simple and easy to manufacture, but frictional drag forces and wear are significant leading to power losses
Solution Approach 1:
The continuous helical thread of conventional worm gears is segmented into discrete roller assemblies that are distributed around the cylindrical body. Each roller assembly acts as an independent rolling element, converting the continuous sliding contact into discrete rolling contacts. This segmentation reduces frictional power loss while maintaining the helical drive function.
Solution Approach 2:
The sliding friction mechanism is replaced with a rolling friction mechanism. Instead of using sliding contact between worm gear teeth, the invention employs roller assemblies that roll along the helical path, substituting the mechanical sliding system with a rolling system that has lower friction and wear.
2Ease of operation
If continuous helical thread is used in conventional worm gears, then the drive is continuous, but engagement and disengagement between screw and nut sections is difficult
Solution Approach 1:
The continuous helical thread is divided into discrete roller assemblies spaced around the cylindrical body. This segmentation allows individual rollers to engage and disengage independently from the nut sections, facilitating easier engagement and disengagement operations while the distributed arrangement of multiple rollers maintains continuous drive stability.
Solution Approach 2:
The discrete roller assemblies can dynamically engage and disengage with the nut sections as needed. The rollers are positioned to allow selective engagement with different nut sections, enabling dynamic control of the drive system for engagement and disengagement operations while maintaining overall drive continuity through the distributed roller arrangement.
3Duration of action of stationary object
If sliding friction is used in worm drives, then the component design is simple, but wear leads to material degradation and reduced lifespan
Solution Approach 1:
The sliding friction mechanism is replaced with rolling friction mechanism using roller assemblies. This substitution significantly reduces wear and material degradation, extending component lifespan. Although the roller assembly structure is more complex than simple sliding surfaces, the reduced wear compensates for the initial complexity by eliminating the need for frequent maintenance and replacement.
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 discrete roller assembly-based helical drive system significantly reduces frictional drag forces and wear, enhancing efficiency and extending the lifespan of components by utilizing rolling elements instead of sliding friction, while also accommodating necessary engagement and disengagement mechanisms.
Implementation Method 1
replacing sliding friction elements with rolling elements can reduce frictional losses and wear of components
Data Source
AI summary
Systems and methods for operation and assembly of a helical drive are provided. A helical drive includes a discrete roller assembly-based roller worm including a body portion and a plurality of discrete roller assemblies disposed in a first helical pattern about the body portion. The helical drive includes an engagement structure including a primary axis, wherein the roller worm is configured to rotate about a central axis to cause linear translation of the roller worm along a length of the engagement structure and the primary axis. The engagement structure includes a plurality of tracks disposed along the length of the engagement structure, where each of the tracks is configured to receive at least one of the roller assemblies during the rotation of the roller worm.