Industrial Robot Wrist Gear Segmentation for Torque Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing wrist structures of industrial robots require a larger reduction ratio for the second wrist motor to drive the second wrist element, leading to a decrease in power transmission efficiency due to the need for a high hypoid gear set reduction ratio.
Innovation Solution
The wrist structure incorporates a second wrist power transmission part with a hypoid gear set, a first reduction gear part, and a second reduction gear part to reduce the rotation speed of the second wrist motor, and a third wrist power transmission part with a hypoid gear set and a third reduction gear part to reduce the rotation speed of the third wrist motor, allowing for efficient torque transmission without excessively increasing the hypoid gear set reduction ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the reduction ratio of the hypoid gear set is increased to provide sufficient torque for driving the second wrist element, then the drive torque is improved, but the transmission efficiency of power deteriorates
Solution Approach 1:
The power transmission path is segmented into multiple stages: a first-stage hypoid gear set provides initial torque multiplication, followed by a second-stage spur gear set that provides additional reduction. This segmentation allows the system to achieve the required total reduction ratio without overloading a single hypoid gear set, thereby maintaining transmission efficiency while providing sufficient drive torque for the second wrist element
Solution Approach 2:
A second-stage spur gear set is introduced as an intermediary between the first-stage hypoid gear set and the second wrist pinion gear. This intermediary gear set shares the reduction burden, allowing the hypoid gear set to operate at an optimal reduction ratio that maintains high transmission efficiency while still achieving the required torque multiplication through the combined two-stage system
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 configuration enables the second wrist element to be driven with a high torque while maintaining efficient power transmission, and the third wrist element is driven with a lower torque requirement, preventing a significant drop in hypoid gear set reduction ratio and enhancing overall transmission efficiency.
Implementation Method 1
the power of the second wrist motor and the third wrist motor which are provided at the first wrist element are transmitted through hypoid gear sets which respectively have pinion gears and ring gears
Data Source
AI summary
A wrist structure of an industrial robot including a second wrist power transmission part transmitting power of a second wrist motor to a second wrist element and a third wrist power transmission part transmitting power of a third wrist motor to a third wrist element. The second wrist power transmission part includes a hypoid gear set, a drive shaft, a first reduction gear part reducing a speed of rotation from the second wrist motor and transmitting the reduced rotation to the drive shaft, and a second reduction gear part reducing a speed of rotation from the drive shaft and transmitting the reduced rotation to the second wrist small gear, and the third wrist power transmission part includes a hypoid gear set and a third reduction gear part reducing a speed of rotation from the third wrist motor and transmitting the reduced rotation to the third wrist small gear.