Vibratory Apparatus Decoupling Eccentric Mass and Crankshaft
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Solution Overview
Problem
Conventional orbiting mass vibrators in rotary-vibratory drills face issues with excess vibratory forces due to misalignment of eccentric masses and crankshafts, leading to potential damage from stress on the crankshafts.
Innovation Solution
A vibratory apparatus with a housing, eccentric mass, crankshaft, first member, and second member, where the first member is hollow and open, allowing radial movement and decoupling of the eccentric mass and crankshaft, with a lubricating liquid layer between the components to reduce stress and misalignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the eccentric masses and crankshafts are rigidly coupled to ensure precise force transmission, then the vibratory energy transmission is improved, but the risk of damage from misalignment and excess vibratory forces increases
Solution Approach 1:
The coupling between the eccentric mass and crankshaft is segmented into two independent parts: the eccentric mass rotates on its own axis independently, while the crankshaft rotates on its own axis independently. The first member allows radial movement between these two components, creating a decoupled system where each part can move without constraining the other, thus eliminating stress transmission from misalignment while maintaining vibratory energy transmission through the housing.
Solution Approach 2:
The first member acts as an intermediary element between the eccentric mass and the crankshaft. It receives rotation from the eccentric mass and allows the crankshaft to rotate independently while transmitting only radial forces to the housing. This intermediary decouples the two rotating components, preventing the transmission of misalignment stresses while maintaining the vibratory energy pathway.
2Manufacturing precision
If the eccentric mass is confined to a fixed orbital path by a cylindrical bore to maintain precise motion control, then the orbital path accuracy is improved, but the stress on the crankshaft from misalignment increases
Solution Approach 1:
The system transitions from a static, rigid confinement (cylindrical bore) to a dynamic, flexible arrangement where the first member allows radial movement. The eccentric mass maintains its orbital path through the interaction of forces rather than rigid mechanical confinement, allowing the system to adapt to misalignment conditions while maintaining orbital accuracy and reducing stress.
3Device complexity
If the crankshaft is directly connected to the eccentric mass to simplify the structure, then the device complexity is reduced, but the incidence of malfunction and damage increases
Solution Approach 1:
The direct connection between the eccentric mass and crankshaft is segmented into independent rotational components. The eccentric mass rotates on its axis independently within the first member, while the crankshaft rotates on its own axis independently. This segmentation adds only one additional component (the first member) while dramatically improving reliability by eliminating the stress transmission pathway that causes malfunctions and damage.
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 decoupling mechanism reduces the incidence of malfunction and damage by allowing self-alignment and compensation for imperfections in the vibratory apparatus, ensuring only radial forces are transmitted to the housing, thereby minimizing stress on the crankshaft.
Implementation Method 1
A liquid forms a lubricating layer between the first member and the eccentric mass
Data Source
AI summary
A vibratory apparatus comprises an eccentric mass disposed within a housing. A shaft and bushing are received by the eccentric mass and couple the eccentric mass to a crankshaft. An internal conduit extends longitudinally within the shaft. Input and output conduits each communicate with the internal conduit to allow a lubricant to flow through the shaft. A bore extends radially through the bushing. Lubricant flowing through the shaft may further flow through the bore and form a lubricating layer between the bushing and the eccentric mass.