Sleeve Unit Manufacturing Using Stopper Mediator for Adhesive Control
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Solution Overview
Problem
The existing methods for manufacturing sleeve units for motors with hydrodynamic-pressure bearing mechanisms face challenges such as adhesive contamination, precise alignment requirements, and risk of surface warping, leading to inconsistent quality and potential damage during assembly.
Innovation Solution
A method involving the use of hydrodynamic bearing surfaces on the sleeve and sleeve housing, with precise alignment and adhesive application to ensure consistent assembly, utilizing a manufacturing device with alignment members and urging mechanisms to restrict movement and secure the sleeve within the housing, preventing adhesive overflow and enhancing adhesive strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the sleeve is inserted into the sleeve housing with a slight interspace to prevent warping, then the sleeve surface warping is prevented, but the adhesive is pushed out and contaminates other surfaces
Solution Approach 1:
A stopper is introduced as an intermediary component between the sleeve and sleeve housing. The stopper fills the interspace that would otherwise cause adhesive to escape, while allowing the sleeve to maintain its slight interspace configuration for preventing warping. The stopper acts as a barrier that contains the adhesive within the intended bonding region.
Solution Approach 2:
The assembly is segmented into three distinct components: the sleeve, the sleeve housing, and the stopper. This segmentation allows each component to perform its specific function - the sleeve provides the bearing surface, the housing provides structural support, and the stopper controls adhesive flow - while working together to resolve the contradiction between preventing warping and avoiding contamination.
2Reliability
If the gap between the sleeve and sleeve housing is extremely narrow to prevent damage during insertion, then the risk of damage is reduced, but the adhesive cannot be properly applied and positioned
Solution Approach 1:
The stopper serves as a mediator that enables proper adhesive application by providing a physical barrier and containment structure. It allows the adhesive to be applied to the sleeve end surface and prevents it from leaking into the narrow gap between the sleeve and housing, making the manufacturing process feasible despite the tight tolerances required for safety.
Solution Approach 2:
The stopper is positioned in advance within the sleeve housing before adhesive application. This preliminary positioning creates the necessary space and containment structure that enables proper adhesive application to the sleeve, solving the manufacturing difficulty that would otherwise result from the extremely narrow gap required for safe insertion.
3Manufacturing precision
If precise alignment is performed to meet the axial separation specification, then the bearing mechanism performance is improved, but the manufacturing complexity and time increase
Solution Approach 1:
The patent replaces complex mechanical alignment procedures with a simpler positioning mechanism involving the stopper. The stopper provides a reference surface and physical constraint that automatically establishes the correct axial separation between the sleeve and housing, eliminating the need for time-consuming manual measurement and adjustment while maintaining high precision.
Solution Approach 2:
The stopper enables the assembly to self-align and self-position during the assembly process. By providing a fixed reference point and physical constraint, the stopper allows the sleeve and housing to automatically achieve the correct axial separation without requiring external measurement tools or complex alignment procedures, significantly reducing manufacturing time while maintaining precision.
Data Source
AI summary
In the manufacture of a sleeve unit (22), when a sleeve (221) is to be glued to a sleeve housing (222), an endfaces (225) of the sleeve (221) while abutting on a sleeve retainer (51) is spring-biased along the center axis J1 in the direction toward the sleeve retainer (51). Meanwhile, an endface (226) on a side of the sleeve housing (222) opposite from the endface (225) of the sleeve (221) while abutting on a sleeve-housing retainer (52) is spring-biased along the center axis J1 in the direction toward the sleeve-housing retainer (52).