Robot Arm Assembly Bevel Gear Distribution
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Solution Overview
Problem
Industrial robot arms with traditional speed reducers are bulky and weaken the mechanism due to the weight being applied on the output shaft, reducing their strength and increasing size.
Innovation Solution
The robot arm assembly employs a compact design using a series of bevel gears to transmit kinetic energy between input shafts, eliminating the need for a large speed reducer and distributing the weight across multiple bevel gears, enhancing mechanism strength and reducing overall size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a traditional speed reducer is used to transmit motor movement to the upper arm, then the robot arm can achieve the required movement, but the robot arm becomes bulky and its mechanism strength is reduced
Solution Approach 1:
The patent divides the speed reduction function into multiple bevel gears (first bevel gear, second bevel gear, third bevel gear) distributed along the robot arm rather than using a single large speed reducer. This segmentation allows the same speed reduction ratio to be achieved while distributing the mechanical load and reducing the volume of any single component.
Solution Approach 2:
The patent arranges the bevel gears in a distributed linear configuration along the robot arm's length rather than concentrating them in a single location. This spatial distribution along one dimension allows the system to maintain compact overall volume while achieving the required speed reduction through multiple smaller gear stages.
2Power
If a traditional speed reducer is positioned in the lower arm or upper arm, then the robot arm can transmit motor movement, but the mechanism strength is reduced due to weight concentration on the output shaft
Solution Approach 1:
The patent segments the weight and mechanical load by distributing multiple bevel gears along the robot arm structure. Instead of concentrating the entire speed reduction function and its associated weight on a single output shaft, the load is divided across multiple gear stages, reducing the stress concentration and enhancing overall mechanism strength.
3Strength
If a bulky speed reducer is used to ensure mechanism strength, then the robot arm can handle heavy loads, but the overall robot arm size increases
Solution Approach 1:
The patent employs multiple smaller bevel gears distributed along the robot arm to replace a single large speed reducer. This segmentation achieves the required strength and load-bearing capacity through distributed structural support while maintaining a compact overall volume, as each individual gear is smaller than the single large speed reducer would be.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design results in a more compact and stronger robot arm assembly with improved mechanism strength and reduced size, allowing for more efficient movement of the end-effector without the need for a bulky speed reducer.
Implementation Method 1
a first bevel gear connected to the first input shaft and configured to mesh with and transmit a rotation of the first input shaft to a second bevel gear; a second bevel gear configured to transmit a rotation of the second bevel gear to a third bevel gear; a third bevel gear configured to transmit a rotation of the third bevel gear to a fourth bevel gear
Data Source
AI summary
A robot arm assembly includes a first robot arm and a second robot arm; the second robot arm is rotatably connected to the first robot arm. The first robot arm includes a first sleeve, a first input shaft, and a second input shaft. The first input shaft and the second input shaft are seated in the first sleeve. The second robot arm includes a second sleeve and an output shaft; the output shaft is received in the second sleeve. The first input shaft is connected to the second sleeve via a pair of bevel gears, and drives the second sleeve to swing relative to the first sleeve. The second input shaft is connected to the output shaft via a plurality of bevel gears meshing with each other, and drives the output shaft to rotate relative to the second sleeve.