Eccentric Gear Tooth Layout for Low-Backlash Torque Reversal
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Solution Overview
Problem
Conventional gear drive systems experience noise due to backlash between gears, especially when alternating loads and torque changes direction, which affects the efficiency and longevity of the system.
Innovation Solution
A gear drive system with a second gear having distinct peripheral portions with varying gear tooth spacings and resilience, allowing for reduced or zero backlash at specific portions to minimize noise and structural stress, while maintaining typical backlash elsewhere to prevent overheating and damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If backlash is provided between gears to reduce overheating or damage, then gear protection is improved, but noise increases due to alternating loads and torque changes
Solution Approach 1:
The second gear is designed with non-uniform tooth spacing where specific portions have reduced or zero backlash while other portions maintain typical backlash. This local differentiation allows the gear to minimize noise at critical positions while preserving protective backlash elsewhere, resolving the contradiction between noise reduction and gear protection
2Reliability
If uniform backlash is provided between gears, then gear protection is maintained, but noise is generated during torque reversals and alternating loads
Solution Approach 1:
Different portions of the second gear's periphery are designed with different tooth spacing characteristics. Specifically, portions corresponding to torque reversal zones have reduced backlash for quiet operation, while other portions maintain standard backlash for protection, allowing the system to achieve both quiet operation and gear protection simultaneously
3Object-generated harmful factors
If backlash is reduced or eliminated at specific portions, then noise is minimized, but gear tooth spacing becomes non-uniform
Solution Approach 1:
The gear tooth spacing is intentionally made non-uniform with specific portions having reduced spacing (zero or minimal backlash) while other portions maintain standard spacing. This localized variation in tooth spacing allows the gear to minimize noise during critical operations while preserving adequate backlash in other zones for protection and lubrication
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 system reduces noise and operational stress, enabling quieter operation and extended gear life by minimizing backlash during torque reversals and maintaining effective torque transmission.
Implementation Method 1
The first peripheral portion and/or the second peripheral portion are more resilient relative portions other than the first peripheral portion and/or the second peripheral portion, resulting in a first backlash between the first set of gear teeth and the teeth of the first gear, and a second backlash between the second set of gear teeth and the teeth of the first gear.
Data Source
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AI summary
A gear drive system is provided having a first gear and a second gear. The second gear has a first peripheral portion and a second peripheral portion. A first set of gear teeth can be defined peripherally over the first peripheral portion and/or the second peripheral portion. The first peripheral portion and/or the second peripheral portion can be more resilient, resulting in a first backlash between the first set of gear teeth and the teeth of the first gear, less than a second backlash between the second set of gear teeth and the teeth of the first gear. Each gear tooth of the second gear can have a gear tooth spacing between adjacent gear teeth. The gear tooth spacing over the first peripheral portion and/or the second peripheral portion can be less than the gear tooth spacing at portions other than the first peripheral portion and/or the second peripheral portion.