Self-Balancing Uni-Drum Compactor With Rotating Sprung Mass
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Solution Overview
Problem
Existing single-drum compactors lack efficient mechanisms for self-balancing and vibration-induced compaction, leading to inefficiencies in substrate compaction.
Innovation Solution
A self-balancing uni-drum compactor design featuring a split cylindrical drum construction with an eccentric assembly and traction system, where the center of gravity alignment and rotation of sprung and unsprung masses create torque for drum rotation, enhancing compaction through vibration and weight distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional single-drum compactor design is used with drive tires and operator cab positioned between drum and tires, then the compactor can propel and operate, but it lacks self-balancing capability and efficient vibration-induced compaction
Solution Approach 1:
The patent applies counterweight principles by positioning the operator cab and engine as a sprung mass with center of gravity lower than the unsprung drum mass. This creates a self-balancing effect where the lower center of gravity of the sprung mass counteracts the higher center of gravity of the unsprung drum, providing inherent stability without additional balancing mechanisms.
Solution Approach 2:
The patent implements dynamic balancing through the relative motion between sprung and unsprung masses. The sprung mass is allowed to rotate relative to the unsprung drum mass about the drum axis, creating dynamic adjustment of the center of gravity position during operation, which enhances self-balancing capability.
2Productivity
If roller compactors use only weight for compression, then the structure is simple, but compaction efficiency is insufficient
Solution Approach 1:
The patent incorporates vibration-induced compaction by allowing the sprung mass to rotate relative to the unsprung drum mass. This relative rotation creates vibratory motion that is transmitted to the drum, enhancing compaction efficiency beyond what weight alone can achieve.
Solution Approach 2:
The dynamic relationship between sprung and unsprung masses creates variable vibration characteristics during operation. The relative motion generates mechanical vibrations that supplement the static weight compression, improving overall compaction productivity.
3Ease of operation
If the center of gravity of sprung mass is positioned higher than unsprung mass, then the compactor is easier to maneuver, but self-balancing is compromised
Solution Approach 1:
The patent positions the sprung mass center of gravity lower than the unsprung mass to create a self-balancing configuration. The lower center of gravity acts as a counterweight that stabilizes the system, providing inherent self-balancing capability without compromising operational control.
Solution Approach 2:
The patent achieves both maneuverability and self-balancing through dynamic design. The sprung mass can rotate relative to the unsprung mass, allowing dynamic adjustment that maintains stability while enabling responsive maneuvering. The system adapts its balance characteristics during operation rather than being statically fixed.
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 design achieves efficient substrate compaction with improved self-balancing and vibration-induced motion, optimizing compaction efficiency without additional controls or actuators.
Implementation Method 1
an eccentric assembly mechanically coupled to the cylindrical drum and arranged to impart vibration to the cylindrical drum when the eccentric assembly is rotated
Implementation Method 2
A head plate is affixed to the cylindrical spool through a shock isolator
Implementation Method 3
The traction system rotates the sprung mass relative to the head plate about the axis of rotation. When the surface compactor machine is in the stationary position, the first center of gravity of the unsprung mass and the second center of gravity of the sprung mass are in vertical alignment, and when the traction system rotates the sprung mass relative to the head plate about the axis of rotation, the second center of gravity of the sprung mass is rotated out of vertical alignment with the first center of gravity of the unsprung mass, thereby imparting torque to the cylindrical spool that causes rotation of the cylindrical drum
Implementation Method 4
a cylindrical drum including a cylindrical drum shell and a cylindrical spool disposed within the cylindrical drum shell and supporting the cylindrical drum shell
Data Source
AI summary
A surface compactor machine includes an unsprung mass including a cylindrical drum and a cylindrical spool disposed within the cylindrical drum, and a sprung mass rotationally coupled to the cylindrical spool. The sprung mass has a center of gravity that is lower than the center of gravity of the unsprung mass when the surface compactor machine is in a stationary position. The sprung mass includes a traction system that rotates the sprung mass relative to the cylindrical spool. When the traction system rotates the sprung mass relative to the cylindrical spool, the second center of gravity of the sprung mass is rotated out of vertical alignment with the first center of gravity of the unsprung mass, thereby imparting torque to the cylindrical spool that causes rotation of the cylindrical drum.