Harmonic Pin Ring Gear Layout for Compact High-Torque Transmission
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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 direction changes, particularly in applications requiring efficient torque transmission and compact installation space.
Innovation Solution
The harmonic pin ring gear system features a 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 compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a conventional gear system is used to transmit torque, then the structure is simple, but the power density is low and the installation space is large
Solution Approach 1:
The patent implements nesting by placing the inner gear with external toothing inside the outer gear with internal toothing, with the pin ring positioned between them. This concentric arrangement allows one gear system to be nested within another, maximizing space utilization and achieving high power density in a compact installation volume.
Solution Approach 2:
The patent transitions from conventional planar gear arrangements to a three-dimensional concentric configuration. The inner and outer gears are arranged axially with the pin ring extending radially between them, utilizing the radial dimension to transmit torque and achieve compact installation space while maintaining high power density.
2Volume of moving object
If a compact gear design is used to reduce installation space, then the volume is reduced, but the rigidity and play control become difficult
Solution Approach 1:
The patent applies local quality by having the pins engage with both the inner gear teeth and outer gear teeth simultaneously at different locations. This dual engagement creates localized stable contact zones that maintain rigidity and control play even in the compact concentric configuration, as each pin is supported at both ends.
Solution Approach 2:
The patent merges the functions of two separate gear transmissions into a single integrated system. The inner gear and outer gear work together with the pin ring to transmit torque, combining their structural advantages to achieve both compact installation space and high rigidity with controlled play.
3Adaptability or versatility
If a simple gear configuration is used, then the device complexity is low, but the speed change versatility is limited
Solution Approach 1:
The patent achieves multi-functionality through the dual-gear configuration where the pin ring can engage with both inner and outer gears. This allows the system to provide multiple speed ratios and transmission directions without requiring separate gear sets, maintaining relatively simple device complexity while enhancing speed change versatility.
Solution Approach 2:
The patent segments the transmission system into distinct functional components: the inner gear, outer gear, and pin ring. This segmentation allows independent optimization of each component while maintaining overall simplicity, enabling versatile speed changes through the coordinated operation of these modular elements.
4Power
If high power density is achieved through compact design, then the installation space is reduced, but the torque transmission efficiency may be compromised
Solution Approach 1:
The patent ensures continuous useful action through the dual engagement of pins with both inner and outer gear teeth. This continuous contact across multiple engagement points minimizes energy loss and maintains high torque transmission efficiency while achieving high power density in the compact concentric configuration.
Solution Approach 2:
The patent employs a composite gear system combining inner gear, outer gear, and pin ring elements that work together synergistically. This composite structure optimizes the distribution of mechanical stresses and forces, maintaining high torque transmission efficiency while achieving compact installation space and high power density.
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.