Segmented Reamer for Restoring Ovalized Wheel Bore Cylindricity
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Solution Overview
Problem
Repeated braking causes ovalization of wheel bores, leading to slack and vibration issues, necessitating costly and labor-intensive re-boring processes that require specialized machinery and skilled personnel.
Innovation Solution
A method using a reamer with a longitudinal pilot portion and cutter portion, allowing for self-centering and manual operation to restore bores to a cylindrical shape without fixed-stand boring machines, combined with a portable rotary drive machine and an extractor tool to facilitate ring extraction and re-boring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional fixed-stand boring machines are used to restore ovalized bores, then manufacturing precision is improved, but device complexity and cost increase
Solution Approach 1:
The reamer is divided into distinct functional segments: a pilot portion for guidance and centering, and a cutter portion for material removal. This segmentation allows the tool to self-center in the ovalized bore while maintaining manufacturing precision, eliminating the need for complex fixed-stand machinery.
Solution Approach 2:
The reamer is designed to be self-centering through its pilot portion that fits within the ovalized bore dimensions. The tool automatically positions itself correctly during insertion, eliminating the need for external positioning devices or skilled operators to align the boring machine, thus simplifying the overall system.
2Manufacturing precision
If traditional fixed-stand boring machines are used, then manufacturing precision is improved, but ease of operation deteriorates
Solution Approach 1:
The reamer automatically centers itself in the ovalized bore through its pilot portion geometry, eliminating the need for skilled operators to position and control complex machinery. Any operator can insert the reamer and it will self-align, dramatically improving ease of operation while maintaining precision.
Solution Approach 2:
Instead of using a large machine to position a small tool, the invention inverts the approach by making the tool itself positionable within the workpiece. The reamer's pilot portion is designed to fit the ovalized bore dimensions, allowing the tool to find its own center rather than requiring external positioning equipment.
3Reliability
If re-boring is performed to restore compliance, then reliability is improved, but loss of time increases
Solution Approach 1:
The reamer combines multiple functions in segmented form: the pilot portion provides guidance and centering, while the cutter portion performs material removal. This integrated design allows simultaneous centering and cutting in a single operation, reducing restoration time while ensuring reliable cylindrical bore geometry for braking safety.
Solution Approach 2:
The reamer design enables continuous cutting action from the moment of insertion. The pilot portion immediately establishes correct positioning, and the cutter portion continuously removes material along the bore length in one smooth operation, eliminating the positioning and adjustment time required by traditional methods.
4Ease of operation
If a pilot portion with diameter less than cutting diameter is used, then ease of operation is improved, but manufacturing precision requirements increase
Solution Approach 1:
The reamer exhibits local quality by having different diameter portions with different functions. The pilot portion has a smaller diameter specifically designed to fit within the ovalized bore dimensions, providing guidance. The cutter portion has a larger diameter for material removal. This local differentiation optimizes both ease of insertion and final bore precision.
Solution Approach 2:
The pilot portion performs preliminary centering and guidance action before the cutter portion begins material removal. By pre-positioning the reamer correctly through the pilot section, the subsequent cutting action automatically maintains precision, reducing the overall manufacturing precision requirements compared to single-diameter tools.
Data Source
AI summary
A method of restoring a wheel (1) to compliance, the wheel having a plurality of ovalized bores (2). The method is characterized in that it includes at least a step of boring a first ovalized bore (2) with the help of a reamer (3) presenting a longitudinal pilot portion (3a) and a longitudinal cutter portion (3b), the cutter portion (3b) presenting teeth (4) defining a cutting diameter (D2), and the pilot portion (3a) presenting a pilot diameter (D1) strictly less than the cutting diameter (D2), the step of boring this first ovalized bore (2) consisting in inserting the reamer (3) into the first ovalized bore (2), beginning with the pilot portion (3a) and followed by the cutter portion (3b), the pilot diameter (D1) being such that it enables the reamer (3) to be guided in translation inside the first ovalized bore (2) for boring.