Parallel Link Mechanism With Reverse Rotation Transmission
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Solution Overview
Problem
Existing parallel link mechanisms suffer from reduced rigidity and increased size due to machining errors and low bearing rigidity, leading to unsatisfied rotation restriction conditions and increased dimensions.
Innovation Solution
A parallel link mechanism with a rotation transmission mechanism that allows one revolute pair section to rotate the other in reverse, using gears or a wire body to accurately transmit rotation and satisfy the rotation restriction condition, thereby improving rigidity and reducing size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the link length is increased to achieve a large operating range of the traveling plate, then the operating range is improved, but the dimensions of the entire mechanism are increased and the rigidity is reduced
Solution Approach 1:
The invention changes the operating parameters by enabling larger rotation angles at the revolute pair sections through the rotation transmission mechanism. This allows the mechanism to achieve a wide operating range without increasing link lengths, thereby maintaining compact dimensions while improving adaptability
2Adaptability or versatility
If the link length is increased to achieve a large operating range, then the operating range is improved, but the rigidity of the entire mechanism is reduced
Solution Approach 1:
The invention changes the rotation angle parameters at the revolute pair sections to enable larger operating ranges. By using the rotation transmission mechanism with gears or wire bodies, the system achieves wide movement范围 without increasing link lengths, thereby maintaining mechanism rigidity while improving operating range
Solution Approach 2:
The invention segments the rotation transmission function into separate components (rotation transmission mechanism with gears or wire bodies) that independently control the rotation angles at different revolute pair sections. This segmentation allows precise control of rotation angles to maintain rigidity while achieving wide operating range
3Ease of manufacture
If machining errors and low bearing rigidity cause the rotation restriction condition to be unsatisfied, then the mechanism can be simpler to manufacture, but the rigidity of the entire mechanism is reduced
Solution Approach 1:
The rotation transmission mechanism acts as a feedback system that actively maintains the rotation restriction condition. The gears or wire bodies transmit rotation information between revolute pair sections, ensuring that rotation angles remain properly restricted despite machining errors or bearing rigidity issues, thereby maintaining mechanism rigidity without requiring ultra-precise manufacturing
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 mechanism achieves improved rigidity and compact size while maintaining a wide range of movement, with simplified design and reduced manufacturing costs through the use of identical gears or a wire body for rotation transmission.
Implementation Method 1
using gears or a wire body to accurately transmit rotation
Implementation Method 2
using gears or a wire body to accurately transmit rotation
Data Source
AI summary
In a parallel link mechanism, a distal end side link hub is coupled to a proximal end side link hub via three link mechanisms such that a posture of the distal end side link hub can be changed relative to the proximal end side link hub. Each link mechanism includes a proximal side end link member rotatably coupled at one end thereof to the proximal end side link hub, a distal side end link member rotatably coupled at one end thereof to the distal end side link hub, and a center link member rotatably coupled at both ends thereof to other ends of the proximal and distal side end link members via both revolute pair sections. The parallel link mechanism includes a rotation transmission mechanism configured to allow rotation of one revolute pair section to rotate the other revolute pair section in reverse.