Dry Variable Speed Drive Mechanism for Wear Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current variable speed drives face premature wear due to lubricant leakage and require frequent maintenance to ensure proper engagement between sheaves, leading to inefficiencies and increased maintenance costs.
Innovation Solution
A variable speed drive mechanism featuring a rotatable drive shaft with a fixed sheave and a movable sheave that utilize drive fingers and recesses for torque transfer, where the finger and recess contacts are hardened through surface treatment to eliminate the need for lubricants and reduce wear, allowing for axial movement and rotation while maintaining torque transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lubricated splines are used to couple the movable sheave to the drive shaft, then the splined connection can be maintained, but lubricant leakage occurs causing premature spline wear and belt wear
Solution Approach 1:
The patent removes the lubrication system entirely from the drive mechanism. Instead of using lubricated splines, the invention employs dry friction surfaces with hardened contacts that transfer torque without requiring any lubricant, thereby eliminating lubricant leakage and the associated maintenance issues
Solution Approach 2:
The patent replaces the traditional lubricated mechanical spline connection with a dry friction-based torque transfer system. The hardened finger contacts and recess contacts create high-friction surfaces that efficiently transfer torque without sliding, substituting the lubrication-dependent mechanism with a lubrication-free alternative
2Power
If wear members are positioned between drive fingers and recesses, then torque transfer is enabled, but the drive mechanism requires maintenance and monitoring to ensure proper engagement
Solution Approach 1:
The patent fundamentally changes the surface properties of the contact surfaces by applying hardening treatments. This parameter change increases surface hardness and wear resistance, allowing the drive fingers and recesses to engage directly without wear members, thereby eliminating the need for maintenance and monitoring of wear components
Solution Approach 2:
The patent eliminates the use of disposable wear members that require replacement. Instead, the hardened contact surfaces are designed to last the lifetime of the drive mechanism, removing the need for periodic maintenance and replacement of wear components
3Quantity of substance
If seals are used to contain lubricant along the splined interface, then lubricant containment is achieved, but leaking lubricant contacts V-belts causing premature belt wear
Solution Approach 1:
The patent removes the lubricant entirely from the system, eliminating the source of the harmful effect. By using a dry friction mechanism with hardened contacts, there is no lubricant to leak onto the V-belts, thus preventing premature belt wear
Solution Approach 2:
The patent converts the potentially harmful lubricant into a unnecessary component. The dry friction system actually benefits from the absence of lubricant, as it eliminates the contamination issue while maintaining effective torque transfer through the hardened contact surfaces
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 enhances wear resistance and reduces maintenance needs by eliminating the requirement for lubricants, thereby extending the lifespan of the drive components and improving operational efficiency.
Implementation Method 1
each finger contact slidably engages the corresponding recess contact... at least one of the finger contact or the recess contact is hardened through a surface treatment
Data Source
AI summary
A variable speed drive having a rotatable drive shaft, a fixed sheave fixed relative to the drive shaft and mounted for rotation with the drive shaft, a movable sheave mounted for axial movement relative to the drive shaft, a plurality of drive fingers projecting axially from one of the sheaves, each drive finger defining a finger contact, and a plurality of recesses in the other sheave, each drive finger being movably received by a corresponding one of the recesses, and each recess defining a recess contact that slidably engages the corresponding finger contact.