Vibratory Pothole Packer Eccentric Shaft Design
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Solution Overview
Problem
Current methods for compacting asphalt in potholes are ineffective, leading to premature repair needs due to insufficient compaction, which results in increased time and expense for road maintenance.
Innovation Solution
A small, lightweight, self-propelled vibratory pothole packer with a cylindrical drum that can be selectively vibrated to compact asphalt, featuring a shock-absorbing structure and a centrifugal clutch system for efficient operation, allowing for effective compaction of asphalt in potholes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional hand compaction methods are used to fill potholes, then the operation is simple and requires no special equipment, but the compaction is insufficient leading to premature repair failure
Solution Approach 1:
The patent applies mechanical vibration through a vibratory drum that generates vibrations at a frequency of 5,000 to 10,000 vibrations per minute. This vibration mechanism compacts asphalt effectively within potholes, ensuring proper densification and eliminating air pockets that would otherwise lead to premature repair failure. The vibratory action transforms the simple hand-compaction method into an effective mechanical compaction process.
Solution Approach 2:
The patent replaces the manual hand-compaction mechanical system with a motorized vibratory system. The electric motor drives the eccentric shaft that generates vibrations, substituting human physical effort with an automated mechanical system. This substitution maintains ease of operation while dramatically improving compaction quality and repair durability.
2Force
If large vibratory rollers are used for pothole repair, then sufficient compaction force is provided, but the equipment is too heavy and difficult to maneuver for small jobs
Solution Approach 1:
The patent segments the large vibratory roller system into a compact, portable unit specifically designed for pothole repair. By dividing the function of large rollers into a smaller, self-contained device with a lightweight frame and compact drum, the invention delivers sufficient compaction force (1600 pounds) while maintaining maneuverability for small jobs. The segmented design allows the equipment to be easily transported and positioned at various pothole locations.
Solution Approach 2:
The patent changes the operational parameters by providing 1600 pounds of compaction force at 5,000 to 10,000 vibrations per minute with an 8-inch compaction depth. These optimized parameters deliver effective compaction for pothole-sized areas without requiring the excessive weight and size of traditional road rollers. The parameter changes enable sufficient force delivery in a compact, maneuverable platform.
3Reliability
If multiple passes are made with shovel compaction to attempt adequate packing, then more time is spent on the repair, but the asphalt still becomes pushed out after traffic passes
Solution Approach 1:
The vibratory drum compacts asphalt through mechanical vibrations at 5,000 to 10,000 vibrations per minute, achieving proper densification in a single pass. This vibration-based compaction method is far more effective than repeated shovel strikes, properly packing the asphalt within the pothole to prevent it from being pushed out by traffic. The mechanical vibration ensures complete compaction throughout the asphalt mass, not just surface-level pressing.
Solution Approach 2:
The vibratory system provides continuous compaction action throughout the pothole fill, ensuring uniform density throughout the asphalt. This continuous effective action eliminates the need for multiple intermittent attempts with the shovel, reducing repair time while improving reliability. The consistent vibratory force ensures the asphalt is properly compacted in one operation rather than requiring multiple passes that still fail to achieve adequate compaction.
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 vibratory pothole packer provides sufficient compaction to extend the lifespan of pothole repairs, ensuring a smooth surface and reducing the frequency of future repairs by effectively compacting asphalt within potholes.
Implementation Method 1
An eccentric shaft is positioned within the drum and is rotatable with respect to the drum. The eccentric shaft has a first end and a second end, and an eccentric mass of the eccentric shaft is positioned closer to the first end than to the second end.
Implementation Method 2
The drum is supported on the frame by a shock absorbing structure. The shock absorbing structure includes at least one shock absorber plate that is secured to each side plate of the frame by one or more shock absorbers.
Data Source
AI summary
A vibratory pothole packer includes a frame that supports an engine and a rotatable drum, and a rotatable eccentric shaft is supported within the drum. The eccentric shaft may be a drum shaft with a mass welded to its surface. The eccentric shaft is supported within the drum by bearings, and is also supported on the frame by bearings. The engine shaft can be selectively linked with eccentric shaft to selectively effect vibrational rotation of the eccentric shaft. The small, lightweight pothole packer is manually movable on a surface by one person, and can be moved along a surface either while the eccentric shaft rotates or while the eccentric shaft is not rotating. The center of mass of the eccentric shaft is offset towards one end of the shaft to allow the vibratory pothole packer to be easily moved in a straight line along a surface.