Balanced Eccentric Mass Speed Variator Design
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Solution Overview
Problem
Previous mechanical speed variation systems with eccentric masses suffer from balancing issues, which hinder industrial exploitation.
Innovation Solution
A variator with an intrinsically balanced structure is achieved by using a constructive system that includes a drive shaft, cam, first and second masses with eccentric holes, and a ring with specific mass distribution and sliding bearings, ensuring dynamic balance and continuous torque transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a mechanical speed variator uses eccentric masses to achieve speed variation, then speed control capability is improved, but balancing problems occur that impair industrial exploitation
Solution Approach 1:
The patent applies counterweight principles by introducing balancing masses that rotate in opposition to the eccentric driving masses. These counterbalancing masses are positioned and dimensioned to generate centrifugal forces that cancel out the unbalanced forces produced by the eccentric masses, thereby eliminating vibrations and enabling industrial exploitation while maintaining speed control capability
Solution Approach 2:
The patent employs asymmetric mass distribution through eccentrically positioned masses with specific dimensional relationships. The driving masses are eccentrically mounted on the drive shaft, and counterbalancing masses are positioned at specific angular offsets and radial distances to create the necessary asymmetry for both speed variation and force balancing
2Speed
If eccentric masses are used for speed variation, then speed control is achieved, but structural balance is compromised
Solution Approach 1:
Counterbalancing masses are strategically positioned on the drive shaft assembly to offset the unbalanced forces generated by eccentric driving masses. The counterbalancing masses rotate synchronously with the drive shaft but are positioned to create opposing centrifugal forces, maintaining structural balance throughout the speed variation cycle
Solution Approach 2:
The mass distribution is segmented into distinct driving masses and counterbalancing masses, each with specific eccentricities and positions. This segmentation allows independent optimization of speed variation characteristics and balancing characteristics, enabling both functions to coexist without compromise
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 solution provides a balanced variator that maintains balance in any dynamic configuration, allowing for modular assembly and continuous torque transmission, addressing the balancing problems of previous models.
Implementation Method 1
a cam composed of a circular disk eccentrically mounted on the drive shaft, which drives into rotation the driven shaft with interposition of a series of eccentric masses
Implementation Method 2
with sliding bearings, which, however, are not always in contact
Data Source
AI summary
A mechanical speed variator is provided with eccentric masses having a balanced structure. The variator includes a drive shaft, provided with a cam composed of a circular disk eccentrically mounted on the drive shaft, which drives the driven shaft in rotation with interposition of a series of eccentric masses, each of them being composed of a circular disk with eccentric circular hole in which another mass of lower dimensions is ratably housed. The larger mass is housed and rotates inside the eccentric hole of a ring coupled with bolts to a flange and counter flange, respectively mounted on the driven shaft and the drive shaft.