Wrapped Plain Bearing Bushing With Protrusion-Plastic Plug Retention
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Solution Overview
Problem
Existing methods for producing composite plain bearing bushings with sliding material plugs are complex and costly, as the bores need to be introduced after manufacturing the bushing blank, limiting the wall thickness and efficiency of the process.
Innovation Solution
A method involving cutting a metal blank, introducing holes with inwardly projecting protrusions, inserting sliding plastics material plugs, and shaping the blank to form the bushing, where the protrusions hold the plugs captive and provide additional clamping pressure during shaping, allowing for thicker bushings with conical holes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If bores are introduced after manufacturing the bushing blank, then the bushing structure is achieved, but the production process becomes complex and costly
Solution Approach 1:
The patent applies preliminary action by introducing holes and inserting plugs into the metal blank before shaping it into the final bushing form. This reverses the conventional sequence where holes are created after bushing manufacture, thereby simplifying the overall production process and reducing complexity.
2Reliability
If plugs are inserted after shaping the bushing, then the bushing form is achieved, but additional clamping pressure and filing are required
Solution Approach 1:
The patent inserts plugs into holes in the blank before shaping, so that the subsequent shaping process itself provides clamping pressure on the plugs through the deformation of the metal. This eliminates the need for additional clamping pressure and filing operations that would be required if plugs were inserted after shaping.
3Length of stationary object
If wall thickness is increased to 55 mm, then thicker bushings are produced, but conventional methods cannot achieve this
Solution Approach 1:
The patent enables production of thick-walled bushings (up to 55 mm) by introducing holes and inserting plugs before shaping. This preliminary action allows the metal to be deformed around the plugs during shaping, providing inherent clamping pressure that secures the plugs in thick sections, which would be impossible with conventional post-manufacturing plug insertion methods.
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 method enables the economical production of bushings with thicker wall thicknesses, up to 55 mm, and provides reasonably priced sliding elements with improved filling and retention of the plastics material, suitable for various industrial applications.
Implementation Method 1
The inwardly projecting protrusion of metal presses into the softer plastics material when the plug is introduced and holds it captive
Implementation Method 2
an additional clamping pressure is exerted on the plugs on bending round to form the bushing due to the resultant hold deformation
Data Source
AI summary
A method for producing a wrapped bushing, includes cutting a metal blank to size: introducing holes into the blank, each hole being provided with at least one inwardly projecting protrusion: inserting plugs of plastics material exhibiting sliding characteristics into the holes; and shaping the blank to form the bushing. The resultant bushing has a substrate of at least one metal in which the holes are provided and filled with the plastics material. Each hole comprises at least one inwardly projecting protrusion.