Flexible Blade Angular Transmission for Backlash-Free Positioning
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Solution Overview
Problem
Existing angular transmission devices, such as worm and ball worm transmissions, suffer from issues like backlash, wear, and inefficiency due to clearance or interference between teeth, and have high inertia and material usage, which affects accuracy and longevity.
Innovation Solution
An angular transmission device utilizing a flexible blade looped around an output shaft, driven by a rotary actuator and linear mobile, providing continuous contact and high efficiency with minimal loss, and using a ball screw and nut system for lubricant-free operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If worm transmission with sustained lubrication is used, then friction is minimized and wear is reduced, but the device requires heavy materials and has high inertia
Solution Approach 1:
The patent replaces the traditional worm gear mechanical contact system with a magnetic field-based interaction system. The stator generates a rotating magnetic field that interacts with the rotor's permanent magnets, eliminating the need for heavy lubricated mechanical contact while achieving smooth transmission with minimal wear and reduced inertia.
2Productivity
If ball worm transmission is used, then efficiency is improved and backlash is reduced, but load capacity deteriorates due to low number of balls
Solution Approach 1:
The patent replaces the ball-worm mechanical contact system with a magnetic field interaction system. The rotating magnetic field from the stator interacts with permanent magnets in the rotor, providing continuous force application across multiple magnet pairs simultaneously, thereby achieving both high efficiency and high load capacity without relying on a limited number of physical balls.
3Ease of operation
If clearance between teeth is increased, then backlash is reduced, but transmission precision deteriorates
Solution Approach 1:
The patent eliminates the tooth clearance issue entirely by replacing the mechanical gear engagement system with a magnetic field interaction system. The rotating magnetic field interacts continuously with the permanent magnets in the rotor, providing smooth transmission without backlash while maintaining high precision through magnetic field control rather than mechanical clearance adjustment.
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
The flexible blade design achieves high efficiency (up to 98%) and increased accuracy with reduced wear and inertia, enabling precise angular positioning and extended device lifetime, suitable for applications requiring low consumption and integration.
Implementation Method 1
The rotation of the input shaft drives a ball screw 7 and generates a linear motion of a ball nut 8
Implementation Method 2
a flexible blade 10 fixed on the linear mobile 6 and looped around the output shaft 3, so that when the actuator moves the linear mobile, the flexible blade 10 drives the rotation of the output shaft 3
Data Source
AI summary
The present invention concerns an angular transmission device comprising: An input shaft and an output shaft, An assembly arranged for coupling the input shaft with the output shaft so that the output shaft can be rotationally driven by the input shaft, the assembly comprising a rotary actuator and a linear mobile, the rotary actuator being coupled with the input shaft and moves the mobile in a translation motion relative to the actuator, the mobile being coupled with the output shaft so that the rotation of the input shaft drives the rotation of the output shaft; the assembly further comprises a flexible blade fixed to said mobile and looped around the output shaft, so that when the actuator moves the mobile, the flexible blade drives the rotation of the output shaft. The invention also comprises a method using said device.