Spindle Motor Adhesive Sealing for Lubricant Leakage
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Solution Overview
Problem
In spindle motors, lubricating oil leaks through flaws between the annular member and the shaft portion, necessitating a sealing mechanism to prevent oil loss and ensure operational integrity.
Innovation Solution
The spindle motor design incorporates an adhesive in the gap between the upper shaft recessed portion and the inside surface of the upper annular member, ensuring the lubricating oil remains contained by using inclined surfaces and recessed portions to manage the adhesive and prevent leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gap is defined between the annular member and the shaft portion for lubricating oil flow, then the lubricating oil can be supplied to the bearing mechanism, but the lubricating oil may leak upwardly out of the annular member through flaws in the shaft portion or annular member
Solution Approach 1:
An adhesive is introduced as an intermediary substance to fill the gap between the shaft portion and the annular member. This adhesive serves as a mediator that prevents lubricating oil leakage through flaws while maintaining the necessary gap for lubricant flow, thus improving sealing performance without significantly increasing structural complexity
Solution Approach 2:
The adhesive is applied locally at specific locations where gaps and flaws exist between the shaft portion and annular member, rather than requiring a complete sealing structure throughout. This localized application prevents oil leakage at critical points while maintaining the overall simplicity of the motor structure
2Reliability
If an adhesive is arranged in the gap between the shaft portion and the annular member to prevent oil leakage, then the sealing performance is improved, but the manufacturing precision requirements increase due to the need for precise adhesive placement
Solution Approach 1:
The adhesive is applied in advance to the shaft portion or annular member before final assembly. This preliminary action allows the adhesive to be positioned accurately on the component surface, and ensures that when components are assembled, the adhesive is already in place to prevent oil leakage, reducing the need for high precision during the final assembly process
Solution Approach 2:
The adhesive serves as a consumable sealing element that can be easily applied and replaced if necessary. Rather than requiring precision-engineered permanent sealing structures, the adhesive provides a cost-effective, simple sealing solution that can be applied with standard manufacturing tolerances
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 configuration effectively prevents lubricating oil from leaking out, maintaining the motor's operational efficiency and extending its lifespan by ensuring consistent fluid dynamics within the bearing mechanism.
Implementation Method 1
An adhesive is arranged in a gap defined between the upper shaft recessed portion and the inside surface of the hole of the upper annular member
Implementation Method 2
a spindle motor and more specifically to a disk drive apparatus using the spindle motor... rotatably supported through a lubricating oil
Data Source
AI summary
A spindle motor includes a stationary portion and a rotating portion. The stationary portion includes a shaft and an upper annular member. The rotating portion includes a sleeve. The shaft includes an annular or substantially annular upper shaft recessed portion recessed radially inward from an outside surface of the shaft. The upper shaft recessed portion is arranged opposite to an inside surface of a hole of the upper annular member. An adhesive is arranged in a gap defined between the upper shaft recessed portion and the inside surface of the hole of the upper annular member.