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, minimal play, and large bandwidth for reduction and transmission ratios while maintaining a compact design, especially in applications requiring rotationally symmetrical construction and efficient torque transmission.
Innovation Solution
The harmonic pin ring gear system employs 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 minimal play.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a conventional single-row pin ring gear system is used, then the structure is simple, but the power density and torque transmission efficiency 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 engage simultaneously 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-row configuration to a multi-dimensional 2.5-row arrangement where pins interact with gears in multiple radial and axial dimensions. This dimensional expansion allows simultaneous engagement with two outer gears and one inner gear, enhancing torque transmission capacity
2Productivity
If the pin ring gear system operates with high radial forces, then the torque transmission is efficient, but the pins experience increased tilting and bending torque
Solution Approach 1:
The patent applies different support conditions to pins at different axial locations. Pins are supported in radial direction both inwards in the external toothing of the inner gear and outwards in the internal toothing of the outer gears, creating localized support zones that distribute tilting and bending forces more evenly along the pin length
Solution Approach 2:
The dual outer gear configuration creates opposing radial support forces that counterbalance the tilting and bending torques experienced by the pins. The symmetric arrangement of outer gears provides counteracting support that reduces net bending moments on the pins while maintaining high torque transmission efficiency
3Volume of moving object
If a compact gear system design is implemented, then the installation space is reduced, but the bandwidth for reduction and transmission ratios is limited
Solution Approach 1:
The 2.5-row pin ring gear system serves multiple functions within a single compact structure. The same pin ring assembly simultaneously engages with two outer gears and one inner gear, enabling the system to achieve multiple reduction ratios and transmission configurations without requiring separate gear sets, thus expanding the bandwidth for reduction ratios while maintaining compact dimensions
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.