Supercharger Shaft-to-Compressor Alignment for Damage-Free Assembly
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Solution Overview
Problem
The existing turbocharger configurations face challenges in accurately fastening the rotary shaft and compressor, leading to poor workability and potential damage due to misalignment and interference, especially when using blind screw holes and screw portions.
Innovation Solution
The turbocharger design incorporates a rotary shaft with a screw portion and a column portion, where the column portion is fitted into a longer fitting hole before the screw portion is screwed into a corresponding screw hole, ensuring accurate alignment and reducing the risk of damage by allowing the shaft centers to coincide early in the assembly process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the screw portion is directly screwed into the blind screw hole without preliminary alignment, then the assembly process is simplified, but the axial centers of the rotary shaft and compressor blade cannot coincide accurately, leading to misalignment and potential damage
Solution Approach 1:
The column portion is inserted into the blind screw hole before the screw portion is screwed in. This preliminary insertion action establishes accurate alignment between the axial centers of the rotary shaft and compressor blade, creating a precise positioning foundation for subsequent fastening operations
Solution Approach 2:
The fastening process is divided into two distinct stages: first inserting the column portion for alignment, then screwing in the screw portion for fastening. This segmentation allows each stage to focus on its specific function - alignment and then secure attachment - thereby achieving both precision and operational ease
2Productivity
If the screw portion and blind screw hole are forced to align without a guiding structure, then the assembly steps are reduced, but the screwing process takes a long time and may cause damage to the screw portion or blind screw hole
Solution Approach 1:
The column portion serves as an intermediary element that facilitates the connection between the rotary shaft and compressor blade. By inserting the column portion first, it acts as a guide that enables smooth and accurate engagement of the screw portion with the blind screw hole, preventing forced alignment and potential damage
Solution Approach 2:
The column portion is inserted into the blind screw hole in advance to establish accurate positioning. This preliminary action prepares the assembly path, allowing the screw portion to be screwed in smoothly without forcing or misalignment, thereby reducing assembly time and eliminating damage risk
Data Source
AI summary
Provided is a supercharger (11) comprising: a hollow housing (15); a rotating shaft (14) rotatably supported by the housing (15); a turbine (12) provided at one axial end of the rotating shaft (14); and a compressor (13) provided at the other axial end of the rotating shaft (14). A threaded section (41) and a circular column section (42) are axially arranged at the other end of the rotating shaft (14). A threaded hole (43) with which the threaded section (41) is engaged and a fitting hole (44) in which the circular column section (42) is fitted are axially arranged in the compressor (13). The axial length of the circular column section (42) and the fitting hole (44) is set to be greater than the axial length of the threaded section (41) and the threaded hole (43).