Eccentric Weight Amplitude Adjustment Mechanism
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Solution Overview
Problem
Existing fatigue testing machines cannot adjust the amplitude of the repetitive torsional moment applied to a test piece during operation, requiring interruptions for adjustment and potentially applying incorrect amplitudes due to complex mechanisms.
Innovation Solution
A repetitive moment generating device that uses eccentric weight rotors with sliding eccentric weight members and a link mechanism to adjust the amplitude of the repetitive moment applied to a test piece during rotation, allowing continuous adjustment without stopping the machine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the amplitude of the repetitive torsional moment is adjusted by stopping the electric motor and repositioning the eccentric weight, then the amplitude can be changed, but the fatigue testing is interrupted and the operation time is increased
Solution Approach 1:
The invention makes the eccentric weight repositionable during rotation by providing a slider that can move along the rotation axis while the eccentric weight rotates. This dynamic adjustment mechanism allows the amplitude to be changed without stopping the motor, resolving the contradiction between amplitude adaptability and testing continuity.
Solution Approach 2:
The invention enables continuous amplitude adjustment during the rotation of the eccentric weight by using a slider that moves along the rotation axis. The useful action of amplitude adjustment continues without interruption to the fatigue testing, maintaining productivity while providing adaptability.
2Productivity
If a complex mechanism is used to adjust the amplitude during operation, then the amplitude can be changed without stopping the machine, but the device complexity increases
Solution Approach 1:
The invention segments the adjustment function from the rotation function by providing a slider that moves independently along the rotation axis while the eccentric weight rotates. This segmentation allows simple, independent adjustment of amplitude without complicating the rotation mechanism, maintaining productivity while minimizing complexity.
Solution Approach 2:
The slider acts as an intermediary element between the amplitude adjustment requirement and the rotating eccentric weight. By introducing this simple intermediary component, the invention enables continuous amplitude adjustment without requiring complex mechanisms, thus maintaining productivity while controlling device complexity.
3Productivity
If the eccentric weight is repositioned while rotating, then the amplitude can be adjusted during operation, but the positioning precision may be compromised
Solution Approach 1:
The invention incorporates a scale that displays the position of the slider, providing visual feedback on the amplitude setting. This feedback mechanism allows the operator to accurately position the slider and achieve the desired amplitude while adjusting during operation, maintaining both productivity and positioning accuracy.
Solution Approach 2:
The invention replaces complex mechanical positioning mechanisms with a simple slider-moving-along-axis system combined with scale feedback. This substitution achieves accurate amplitude positioning during operation without requiring complex mechanical systems, maintaining both adjustment continuity and positioning accuracy.
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
Enables continuous adjustment of the amplitude of the repetitive moment applied to a test piece, eliminating interruptions and ensuring accurate application of desired amplitudes, comparable to advanced hydraulic fatigue testing machines at a lower cost.
Implementation Method 1
a first eccentric weight rotor (6) and a second eccentric weight rotor (7) that rotate along with the shaft bodies (4, 5)
Data Source
Figure 1~2
Figure 3~4
AI summary
Provided is a repetitive moment generating device that can be used for a fatigue testing machine and allows for a change in an amplitude of a repetitive moment to be imparted on a test piece even during rotation of an eccentric weight. A repetitive moment generating device 100 includes: eccentric weight members 6c, 7c provided at shaft bodies 4, 5 in a state where the eccentric weight members 6c, 7c intersect the rotatably held shaft bodies 4, 5 and in a state where the eccentric weight members 6c, 7c are slidable in a direction that intersects the shaft bodies 4, 5; sliders 31, 32 that are attached to the shaft bodies 4, 5 in a state where the sliders 31, 32 are slidable in a direction of shaft centers 4c, 5c of the shaft bodies 4, 5 and in a state where the shaft bodies 4, 5 are able to idle; link mechanisms 34, 35 that convert sliding motion of the sliders 31, 32 in the directions of the shaft centers 4c, 5c into sliding motion in a direction that intersects the shaft bodies 4, 5 and transmit the sliding motion to the eccentric weight members 6c, 7c; handle 44 that are operation means for causing the sliders 31, 32 to slide in the directions of the shaft centers 4c, 5c of the shaft bodies 4, 5; and the like.