Rotating Machine Casing With Laser-Roughened Housing Interfaces
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Solution Overview
Problem
Existing rotating machines, such as turbochargers, suffer from positional deviations between housings due to wear or damage of positioning pins and reduced friction coefficients at abutment parts, leading to potential malfunctions.
Innovation Solution
A casing for rotating machines is designed with laser-irradiated rough surface regions on housing connection parts, enhancing frictional resistance and adhesiveness between housings through laser-formed marks, thereby suppressing positional deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a positioning pin is used to suppress rotation of housings, then the housings are constrained in position, but the positioning pin wears or damages over time, reducing its effectiveness in suppressing positional deviation
Solution Approach 1:
The invention removes the positioning pin component entirely and replaces it with a positioning groove structure integrated into the housing, eliminating wear and damage issues associated with protruding positioning pins while maintaining positioning functionality
Solution Approach 2:
Instead of using a protruding positioning pin that extends outward and is susceptible to damage, the invention inverts the approach by using a recessed positioning groove that receives the positioning feature, making the structure more robust and resistant to wear and damage
2Force
If an undulation is formed in the abutment part by a knurling process to increase friction coefficient, then the friction between housings is improved, but the accuracy of forming the undulation is low, reducing the friction coefficient effectiveness
Solution Approach 1:
The invention replaces the mechanical knurling process with a laser surface treatment process, using optical energy to create the rough surface structure, thereby achieving higher precision undulation formation and more effective friction increase
Solution Approach 2:
The invention changes the surface roughness parameters by creating a specific undulation pattern through laser treatment with controlled amplitude and wavelength, optimizing the friction coefficient through precise parameter control rather than approximate mechanical knurling
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 solution effectively suppresses positional deviations between housings, improving the reliability of rotating machines by reducing malfunctions and enhancing the frictional resistance and adhesiveness between housing surfaces.
Implementation Method 1
a rough surface region in which a plurality of laser irradiation marks formed by irradiation with laser light are formed
Data Source
AI summary
A casing that is for a rotating machine and that is configured such that a plurality of housings are linked together, the casing comprising: a first housing including a first connection part that protrudes outward in a radial direction of the rotating machine and that has a first surface extending along the radial direction; a second housing including a second connection part that protrude outward in the radial direction and that has a second surface extending along the radial direction and being in contact with the first surface; and at least one fastening device that fastens the first connection part and the second connection part in the axial direction of the rotating machine, wherein at least one of the first surface or the second surface includes, at least at a portion thereof, a rough surface region having formed therein a plurality of laser irradiation marks formed by irradiation with laser light.