Harmonic Pin-Ring Gear Layout for High-Torque Compact Drives
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Solution Overview
Problem
Existing gear systems face challenges in providing high power density, rigidity, and compact design while maintaining low play and allowing for versatile speed changes and directional changes, particularly in applications requiring efficient torque transmission.
Innovation Solution
The harmonic pin ring gear system features a unique configuration with two outer gears having internal toothing, a single inner gear with external toothing, and a pin ring with laterally protruding pins, utilizing a rotary transmitter to distribute radial forces effectively between the inner and outer gears, ensuring efficient torque transmission and support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a conventional single-row gear system is used, then the structure is simple, but the power density and torque transmission capability are limited
Solution Approach 1:
The patent combines two outer gears with internal toothing and a single inner gear with external toothing into a unified 2.5-row pin ring gear system. The pins simultaneously engage with both outer gears and the inner gear, merging multiple gear interactions into a single integrated structure that increases power density without proportionally increasing complexity
Solution Approach 2:
The patent transitions from a conventional single-plane gear arrangement to a multi-dimensional configuration where pins extend axially between two outer gears spaced apart in the axial direction. This spatial arrangement allows torque transmission through multiple engagement points simultaneously, enhancing power capacity while maintaining compact overall dimensions
2Volume of moving object
If the gear system is made more compact, then the installation space is reduced, but the rigidity and play control become more difficult
Solution Approach 1:
The inner gear with external toothing is nested within the space between the two outer gears. The pins are arranged to engage simultaneously with the inner gear and both outer gears, creating a nested configuration where multiple gear elements occupy overlapping spatial volumes. This nesting achieves high compactness while maintaining rigidity through multiple constrained engagement points
Solution Approach 2:
Multiple gear support functions are merged into a single integrated structure where the two outer gears and one inner gear work together as a unified system. The shared pin connections create interdependent constraints that control play and enhance rigidity without requiring additional separate support mechanisms, achieving stability in a compact package
3Reliability
If the pin ring gear system uses a single inner gear configuration, then the structure is simplified, but the load distribution and durability are reduced
Solution Approach 1:
The gear system is segmented into two distinct outer gears with internal toothing positioned at different axial locations, with a single inner gear with external toothing positioned between them. This segmentation allows the pins to engage with multiple separate gear elements, distributing the load across more contact points and improving durability while maintaining a relatively simple overall configuration
Solution Approach 2:
The pin support configuration exhibits local quality variation: pins at different axial positions engage with different gear combinations. The first outer gear engages pins at its axial location, the inner gear engages pins at its location, and the second outer gear engages pins at its location. This localized engagement optimization improves load distribution and durability without requiring complete symmetry or uniformity throughout the entire system
Data Source
AI summary
A harmonic ring gear system can include at least one inner gear with external toothing, the at least one inner gear defining an axis of rotation; at least one outer gear with internal toothing arranged concentrically to the at least one inner gear about the axis of rotation, the internal toothing spaced apart from the external toothing; a pin ring positioned between the at least one inner gear and the at least one outer gear, the pin ring comprising a multiplicity of pins; and a rotary transmitter configured to lift a portion of the pins of the multiplicity of pins off the external toothing and press the portion of the pins into the internal toothing.