Compliant Split Gear Structure for Anti-Backlash Load Transfer
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Solution Overview
Problem
Existing gear systems suffer from backlash, which leads to inefficiency, friction, and wear, and existing solutions either compromise efficiency or increase manufacturing complexity.
Innovation Solution
A gear system with compliant features that includes a pair of meshing gears, one section for load carrying and another for backlash reduction, connected by a compliant section with reduced stiffness, allowing relative movement and preload to minimize backlash at low loads and switch to load carrying at higher loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If backlash is minimized through conventional methods, then positional control accuracy is improved, but efficiency is lowered and friction and wear increase
Solution Approach 1:
The gear is divided into two distinct sections: a first gear section with gear teeth for load carrying, and a second gear section with different gear teeth configuration for backlash control. This segmentation allows each section to be optimized for its specific function, enabling backlash reduction without compromising overall efficiency
Solution Approach 2:
Different portions of the gear have different properties: the first gear section has teeth designed for strength and load carrying, while the second gear section has teeth with different geometry (such as different pressure angles or tooth profiles) specifically optimized for minimizing backlash. This local differentiation allows the gear to simultaneously achieve both efficiency and precision
2Device complexity
If a single gear section is used for both load carrying and backlash control, then device complexity is reduced, but the gear cannot effectively switch between functions under different loading conditions
Solution Approach 1:
The gear system dynamically adapts its function based on loading conditions. Under light loads, the second gear section engages to provide backlash control. Under heavy loads, the first gear section engages to carry the load. This dynamic switching is enabled by the compliant connection between sections and the biasing mechanism, allowing the gear to automatically select the appropriate function without external control
3Strength
If gear sections are made rigid for strength, then load carrying capacity is improved, but backlash control through relative movement is compromised
Solution Approach 1:
A compliant section connects the first and second gear sections, providing flexibility where needed. This compliant connection includes features such as reduced thickness, slots, or cutouts that reduce stiffness and enable relative movement between gear sections for backlash control, while the gear sections themselves remain rigid for load carrying
4Measurement precision
If preload is applied to reduce backlash, then positional accuracy is improved, but friction and wear increase under continuous operation
Solution Approach 1:
The biasing mechanism applies preload to the second gear section to eliminate backlash, but this preload is dynamically adjusted based on operating conditions. Under light loads, full preload is applied for maximum backlash reduction. Under heavy loads, the compliant connection allows the sections to move relative to each other, reducing the effective preload and thereby reducing friction and wear during continuous operation
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 provides effective backlash control, enhancing positional accuracy and efficiency while minimizing wear and manufacturing complexity.
Implementation Method 1
a compliant section that has features that reduce stiffness so that the gear sections are moveable relative to each other
Implementation Method 2
One gear section is biased relative to the other gear section so that its teeth are preloaded against the teeth of the first gear
Data Source
AI summary
Gear systems provide backlash control at low loading and effective load carrying at increased loading. A gear system with backlash control includes at least two meshing gears. One of the gears has a gear section configured for carrying loads and another gear section configured to control backlash. The gear sections are connected together by a compliant section that has features that reduce stiffness so that the gear sections are moveable relative to each other. One gear section is biased relative to the other gear section so that its teeth are preloaded against the teeth of the first gear.