Speed Reduction Device with Face Gear and Planet Gear
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Solution Overview
Problem
Conventional speed reduction devices for robots, particularly in human-shaped intelligent robots, face challenges in achieving a compact structure with high torque and specific speed reduction ratios, leading to inconsistencies during manufacturing, testing, and assembly due to multiple stage gear transmission, which increases costs and complexity.
Innovation Solution
A speed reduction device utilizing a combination of a first stage speed reduction assembly with a power gear and face gear, and a second stage NGW type planet gear transmission assembly, featuring a sun gear, planet gear set, fixed gear, and output gear, which allows for a compact structure with a high single transmission ratio, reducing the number of gears and ensuring consistency during assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If multiple stage gear transmission is used to achieve high speed reduction ratio, then the speed reduction requirement is satisfied, but the device complexity and manufacturing consistency deteriorate
Solution Approach 1:
The patent employs a planet gear mechanism where multiple gears are nested within a compact structure. The planet gears rotate around the sun gear while being constrained by the ring gear, achieving high speed reduction ratio within a single stage. This nesting principle eliminates the need for multiple sequential gear stages, thereby reducing device complexity while maintaining high transmission ratio.
Solution Approach 2:
The patent transitions from linear parallel shaft gear transmission to spatial planet gear transmission. By arranging gears in a radial configuration around a central sun gear, the system achieves three-dimensional power transmission. This dimensional change allows multiple gear interactions to occur simultaneously in space, achieving high speed reduction in a single stage rather than requiring multiple linear stages.
2Device complexity
If parallel shaft gear transmission is used, then the structure is simple, but the load bearing capability and compactness deteriorate
Solution Approach 1:
The planet gear mechanism nests multiple load-bearing gears (sun gear, planet gears, ring gear) within a compact volume. The planet gears are distributed around the sun gear, allowing simultaneous load distribution across multiple contact points. This nested arrangement achieves both structural compactness and high load bearing capability, overcoming the limitations of simple parallel shaft transmission.
Solution Approach 2:
The patent combines multiple gear functions into a single integrated planet gear mechanism. The sun gear, planet gears, and ring gear work together as a unified system, where the planet gears simultaneously engage with both the sun gear and ring gear. This merging of functions achieves high load bearing capability and compact structure, contrasting with the separated stages of parallel shaft transmission.
3Volume of stationary object
If NGW type planet gear transmission is used, then the structure is compact and load bearing capability is strong, but the single transmission ratio is limited
Solution Approach 1:
The patent uses a nested planet gear configuration where planet gears are positioned between the sun gear and ring gear. This nesting allows for optimized gear tooth engagement and increased transmission ratio within the same compact volume. The multiple planet gears share the load while collectively achieving a higher single-stage transmission ratio than conventional NGW designs.
Solution Approach 2:
The patent modifies key parameters of the planet gear mechanism, including the number of planet gears, their distribution angles, and tooth configurations. By optimizing these parameters, the system achieves a higher single-stage transmission ratio while maintaining compact structure and strong load bearing capability, overcoming the transmission ratio limitation of conventional NGW type mechanisms.
Data Source
AI summary
The present disclosure provides a speed reduction device, a joint servo and a robot. The speed reduction device includes a driving device, a first stage speed reduction assembly and a second speed reduction assembly. The first speed reduction assembly includes a power gear and a face gear. The second speed reduction assembly includes a sun gear that rotates coaxially with the face gear, a planet gear set driven to rotate by the sun gear, a fixed gear, an output gear for outputting power and a fixed shaft. The speed reduction device uses the first speed reduction assembly and the second speed reduction assembly for power transmission and is compact in structure and has a high single stage transmission ratio.