Transverse Cycloidal-Pin Gear Pair for Stable Nutation Reduction
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Solution Overview
Problem
Traditional nutation deceleration devices with involute tooth profiles suffer from low transmission efficiency, profile overlap interference, radial interference, and complex, costly manufacturing due to internal bevel gears, resulting in small carrying capacity and transmission instability.
Innovation Solution
A transverse cycloidal-pin gear pair with cycloidal tooth profiles and angled reference surfaces between 88° and 91°, allowing for increased teeth meshing during nutation transmission, simplifying manufacturing, and enhancing stability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If involute tooth profile is used in nutation deceleration device, then manufacturing is easier, but transmission efficiency is low and interference issues occur
Solution Approach 1:
The patent changes the tooth profile parameter from involute to cycloidal, and adjusts the reference surface angle parameter to 88°-91°, which fundamentally alters the meshing characteristics and eliminates interference while improving transmission efficiency
2Reliability
If internal bevel gear is used for two-stage gear, then teeth meshing number increases, but manufacturing complexity and cost increase
Solution Approach 1:
The patent changes the reference surface angle parameter to 88°-91°, making the reference surface substantially perpendicular to the axis, which simplifies the gear structure while maintaining increased teeth meshing capability
Solution Approach 2:
Instead of using internal bevel gear arrangement, the patent inverts the approach by using transverse cycloidal gears with specifically angled reference surfaces, achieving the same stability improvement through a different structural configuration
3Device complexity
If conventional tooth profile is used, then structure is simpler, but number of meshing teeth is small and carrying capacity is low
Solution Approach 1:
The patent optimizes the reference surface angle parameter to 88°-91° and uses cycloidal tooth profile, which increases the number of simultaneously meshing teeth to 4-5 times compared to traditional designs, significantly improving carrying capacity
Data Source
AI summary
A transverse cycloid-pin gear pair includes a cycloidal gear with a cycloidal tooth flank and a pin gear with a pin tooth flank, the pin gear meshing with the cycloidal gear in a nutation transmission manner. Angles between reference surfaces of the pin gear and the cycloidal gear and corresponding axes are between 88° and 91°, and a sum of the two angles is less than 180°. Portions of the pin tooth flank and the cycloidal tooth flank are pin gear working flank and cycloidal gear working flank, respectively. A pressure angle between the pin gear working flank and the cycloidal gear working flank when meshing satisfies 45°−β−5°≤α≤45°−β+5°, where α is the pressure angle, β is a friction angle. A nutation deceleration device comprises a shell, a transverse cycloidal-pin gear pair, an input mechanism, an output mechanism, and a torque transfer component.