C-Shaped Slide Bearings for Vibratory Rammer Wear Reduction
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Solution Overview
Problem
The manufacturing and use of vibratory percussion rammers with non-metallic wear components are hindered by expensive and time-consuming processes, and these components are prone to breakdown due to thermal expansion and friction, leading to costly repairs and maintenance.
Innovation Solution
The use of C-shaped slide bearings made from ultra-high molecular weight polyethylene or polytetrafluoroethylene, with open seams that allow for thermal expansion and flexibility, reducing metal-on-metal contact and facilitating easier installation and replacement, thereby simplifying the manufacturing process and extending the rammer's lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If slide bearings are machined from extruded polyethylene tube, then wear reduction is achieved, but manufacturing cost and time increase significantly
Solution Approach 1:
The patent divides the single long slide bearing into multiple shorter slide bearing segments that are stacked together. Each segment can be easily manufactured from extruded polyethylene tube without requiring expensive and time-consuming machining operations. The segments are designed to fit within the guide tube and work collectively to provide wear reduction along the entire length of the reciprocating components.
Solution Approach 2:
The patent employs inexpensive polyethylene tube material for the slide bearings instead of expensive machined materials. The slide bearings are designed as replaceable wear components that can be easily manufactured and replaced when worn, reducing overall system cost and maintenance time.
2Ease of manufacture
If multiple shorter slide bearings are stacked in series, then manufacturing becomes feasible, but assembly complexity and installation difficulty increase
Solution Approach 1:
The patent designs the multiple slide bearing segments to be nested or stacked within the guide tube structure. Each segment is sized to fit within the available space, and they are arranged in series along the length of the guide tube. This nesting approach allows for easy installation and replacement without requiring complex assembly procedures.
3Ease of manufacture
If slide bearings are made from non-metallic material, then cost is reduced, but thermal expansion causes breakdown and jamming
Solution Approach 1:
By dividing the slide bearing system into multiple separate segments with gaps between them, the patent allows each segment to expand and contract independently in response to thermal changes. This segmentation prevents the cumulative expansion that would cause jamming in a single continuous bearing, while still maintaining the cost advantages of non-metallic polyethylene material.
Solution Approach 2:
The patent designs the slide bearing system to be dynamically adaptable to thermal conditions. The gaps between segments allow the bearing material to expand and contract freely with temperature changes, maintaining functional clearance under varying thermal conditions. This dynamic design enables the use of inexpensive non-metallic materials without sacrificing reliability.
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
This solution reduces the cost and complexity of manufacturing, decreases the likelihood of jamming, and lowers maintenance costs by allowing for easier replacement of worn components, while maintaining effective lubricity and reducing friction and heat generation.
Implementation Method 1
One or more slide bearings are disposed in the percussion delivery unit between adjacent surfaces of reciprocating metal components to prevent metal-on-metal contact
Implementation Method 2
The slide bearings are self lubricating, flexible, difficult to handle, chuck, and cut
Implementation Method 3
as heat increases, the slide bearings tend to expand and as heat decreases, the slide bearings tend to contract
Data Source
AI summary
A vibratory percussion rammer includes a gear box, a percussion delivery unit extending downwardly from the gear box, and one or more slide bearings disposed in the percussion delivery unit between adjacent surfaces of reciprocating metal components. The slide bearings are made from a sheet of plastic material that is curved into the shape of a tube having a C-shape in cross section and define an open seam extending the entire length of the slide bearing. Slide bearings according to this design can be disposed in the percussion delivery unit to eliminate some or all of the metal-on-metal contact between reciprocating components, including between the ram and shaft assembly and spring box and the guide cylinder, the spring separator and the spring box, and the shaft of a ram and shaft assembly and an upper end of the spring box. The seam width of any slide bearing is wider than the anticipated width-wise thermal expansion of the slide bearing during normal operation. When a plurality of slide bearings are used, the slide bearing that is the easiest to replace has a seam selected to close and fail at a temperature in excess of normal operating temperature that is lower than the excess temperature leading to failure of other slide bearings.