Drive Shaft Seal Structure with Recessed Index Marking
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Solution Overview
Problem
The existing drive shaft structure in turbo compressors is prone to damaging the seal member during disassembly and assembly due to burrs formed around index marks, leading to increased maintenance costs and potential leaks.
Innovation Solution
A drive shaft structure with a second surface closer to the inner radial direction than the outer peripheral surface, featuring a tapered diameter with an index mark, and a fixed seat portion with a reference mark, allowing the seal member to avoid contact with the index mark during assembly and disassembly, thus preventing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an index mark is formed by punch on the outer peripheral surface of the drive shaft, then the operation of the flow rate control unit can be confirmed, but burrs are formed around the index mark which may damage the seal member during disassembly and assembly
Solution Approach 1:
The index mark is moved from the outer peripheral surface (first surface) to the second surface located closer to the inner radial direction. This dimensional relocation allows the index mark to serve its visibility function while being positioned away from the seal member contact zone, eliminating the burr damage risk.
Solution Approach 2:
The drive shaft surface is segmented into multiple functional zones: the outer peripheral surface for seal member contact and the inner radial surface for index marking. This segmentation allows each surface to serve its specific function without interfering with the other, resolving the contradiction between visibility and seal protection.
2Ease of repair
If the drive shaft and seal member are disassembled and assembled during maintenance, then the interior of the turbo compressor can be inspected, but the seal member may be damaged by burrs formed at the index mark location
Solution Approach 1:
Relocating the index mark to the second surface creates a spatial separation between the inspection feature and the seal member interface. This allows maintenance operations to proceed without the seal member encountering burrs, preserving air-tightness while maintaining ease of repair.
3Reliability
If the seal member is provided in close contact with the outer peripheral surface of the drive shaft, then air-tightness can be ensured, but the seal member is vulnerable to damage from burrs formed during index mark creation
Solution Approach 1:
The index mark is positioned on the second surface (inner radial direction) while the seal member contacts the outer peripheral surface. This dimensional arrangement allows the seal member to maintain close contact for air-tightness without being exposed to burrs formed during index mark creation, thus preserving both reliability and strength.
Solution Approach 2:
The drive shaft is segmented into distinct functional surfaces: the outer peripheral surface dedicated to seal member contact and the second surface for index marking. This segmentation isolates the seal member from burr formation zones, protecting seal integrity while ensuring air-tightness.
Data Source
AI summary
Provided is a drive shaft structure including: a drive shaft which transmits the drive force; and a seal member which is provided to come into close contact with the outer peripheral surface of the drive shaft. In the drive shaft structure, the drive shaft includes a second surface located closer to the inner side of the radial direction than the outer peripheral surface, and the second surface includes an index mark used to confirm information on the rotation of the drive shaft or information on the displacement thereof in the axial direction.