Robotic Hand with Planetary Gear Transmission
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Solution Overview
Problem
Conventional robotic hands lack the ability to efficiently grasp and manipulate building blocks with a compact structure that meets functional requirements, necessitating an improved design for enhanced functionality.
Innovation Solution
A robotic hand design incorporating a two-stage planetary gear transmission assembly, comprising a servo housing, a motor, a plastic circuit board, and three rotatable claws, where the motor drives the planetary gear transmission assembly to control the movement of a movable plate, allowing the claws to open or close to grasp objects, utilizing a compact structure with a shared ring gear for cost and space efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a conventional robotic hand design is used, then the basic grasping function is achieved, but the structure is not compact and assembly efficiency is low
Solution Approach 1:
The patent combines two-stage planetary gear transmission mechanisms into a single integrated assembly where the first and second planetary gears share a common ring gear and are mounted on the same gear carrier. This merging of transmission stages reduces the number of separate components and simplifies the overall structure, achieving a more compact robotic hand design while maintaining efficient assembly procedures
Solution Approach 2:
The ring gear serves multiple functions simultaneously: it acts as the outer gear for both the first and second planetary gear stages, providing a shared structural element that reduces component count. This multi-functional design allows a single component to fulfill multiple transmission roles, improving both compactness and manufacturing efficiency
2Measurement precision
If a two-stage planetary gear transmission assembly is used, then the grasping precision is improved, but the device complexity increases
Solution Approach 1:
By merging the two planetary gear stages into a single integrated assembly with shared components (common ring gear, shared gear carrier), the patent reduces the number of separate assemblies that would otherwise need to be manufactured, assembled, and aligned independently. This integration maintains the precision benefits of two-stage transmission while reducing overall device complexity
Solution Approach 2:
The first planetary gear is nested within the same structural framework as the second planetary gear, with both stages sharing the ring gear and gear carrier. This nested arrangement allows the transmission assembly to achieve compact two-stage reduction without the complexity of separate, stacked assemblies, simplifying the overall device structure while maintaining precision
Data Source
AI summary
A robotic hand includes a servo housing, a plastic circuit board (PCB), a motor, a planetary gear transmission assembly and a movable plate that are mounted within the servo housing, and a plurality of claws rotatably connected to the servo housing. The motor is electrically connected to the PCB. The planetary gear transmission assembly is connected to an output shaft of the motor. The movable plate is connected to an output shaft of the planetary gear transmission assembly and movable when driven by the planetary gear transmission assembly. One end of each of the claws is pivotally connected to the movable plate and the claws are rotatable toward or away from one another when driven by the movable plate.