Harmonic Pin Ring Gear Layout for Compact High-Torque Transmission
Find Innovative SolutionsGenerate Solutions
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, 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, and positioning the pin ring with pins between them. This concentric arrangement allows multiple gear components to occupy the same radial space, significantly increasing power density while reducing the overall installation footprint of the transmission system.
Solution Approach 2:
The patent transitions from a conventional single-plane gear arrangement to a three-dimensional concentric configuration. By utilizing the axial dimension to stack gear sets (inner gear, pin ring, outer gear) along the rotational axis, the system achieves higher power density without proportionally increasing the radial installation space.
2Volume of moving object
If a compact gear design is used, then the installation space is reduced, but the rigidity and play control are compromised
Solution Approach 1:
The patent applies local quality by providing targeted radial support at specific locations where pins engage with both the inner and outer gears. This localized reinforcement at critical contact points maintains rigidity and minimizes play in the compact design, while other regions can remain space-efficient without compromising overall structural stability.
Solution Approach 2:
The patent merges the support functions of multiple components by having the pin ring simultaneously engage with both the inner gear and outer gear. This combined engagement creates a rigid triangular support structure that minimizes play and enhances stability within the compact concentric arrangement, as the pins are supported from both radial directions.
3Device complexity
If a single inner gear is used, then the device complexity is reduced, but the speed change versatility is limited
Solution Approach 1:
The patent implements dynamics by making the pin ring deformable rather than rigid. The pin ring can dynamically adjust its shape to accommodate different engagement configurations with the inner and outer gears, enabling versatile speed changes and direction reversals without requiring multiple fixed gear sets. This dynamic adaptability achieves versatility while maintaining relatively simple device structure.
Solution Approach 2:
The patent applies universality by designing the pin ring to perform multiple functions: it transmits torque, enables speed reduction, allows direction reversal, and adapts to different engagement states with the inner and outer gears. This single multi-functional component replaces what would traditionally require multiple specialized gear sets, achieving speed change versatility without proportionally increasing device complexity.
Data Source
AI summary
A harmonic pin ring gear system includes an input and output shaft and two outer gears, each with internal toothing, a single inner gear with external toothing arranged concentrically to a first outer gear and inside said first outer gear in axial direction, and a drive means extending between the two outer gears and the inner gear comprising a pin ring formed as one part in circumferential direction and a multiplicity of pins that protrude laterally in axial direction from the pin ring, a rotary transmitter for lifting the drive means off the external toothing of the inner gear and pressing the drive means into the internal toothing of the outer gear, wherein the input shaft is mounted on one side in the inner gear, the inner gear is mounted in an inner gear ball bearing, and the inner gear ball bearing is mounted in a housing cover.