Bearing Structure with Close Fit and Outer Ring
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Solution Overview
Problem
Current bearing structures with close fits face challenges in achieving precise tolerance control and high manufacturing costs, particularly in the assembly of shaft sleeves and bearings, leading to increased costs and potential contamination issues during the dispensing process.
Innovation Solution
A bearing structure with a close fit comprising a fan frame, a shaft sleeve, and an outer ring set, where the shaft sleeve is inserted into the fan frame with a receiving space containing a bearing set, and an outer ring is sleeved around the shaft sleeve to enhance precision and reduce assembly time and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If tight tolerance is used between shaft sleeve and bearing, then assembly precision is improved, but manufacturing cost increases and bearing is prone to damage
Solution Approach 1:
The patent introduces a positioning ring as an intermediary component between the shaft sleeve and the bearing. The positioning ring features a positioning protrusion that fits into a positioning groove on the bearing, providing precise positioning without requiring tight tolerance between the shaft sleeve and bearing directly. This mediator component enables accurate assembly while allowing for more relaxed manufacturing tolerances, thereby reducing manufacturing costs and preventing bearing damage.
2Ease of manufacture
If loose tolerance is used between shaft sleeve and bearing, then manufacturing cost is reduced, but fixing effectiveness is insufficient
Solution Approach 1:
The positioning ring serves as a mediator that ensures reliable fixing effectiveness despite loose tolerances. The positioning protrusion and groove mechanism provides precise alignment and secure positioning, compensating for the looser tolerance between the shaft sleeve and bearing. This allows manufacturing to be performed more easily while maintaining the reliability and effectiveness of the bearing fixation.
3Manufacturing precision
If integral overmolding method is used, then assembly precision is improved, but mold design cost and manufacturing complexity increase
Solution Approach 1:
The patent segments the assembly into separate components: the shaft sleeve, the bearing, and the positioning ring, which can be manufactured independently using conventional processes. This segmentation avoids the need for complex integral overmolding molds while achieving the same assembly precision through the positioning ring's protrusion-groove mechanism. Each component can be manufactured separately with standard tolerances, reducing mold design complexity and manufacturing difficulty.
Data Source
AI summary
The present invention relates to a bearing structure with a close fit, which comprises a fan frame having a base and a shaft sleeve disposed vertically. The shaft sleeve has a receiving space in which a bearing set is disposed. At least one external ring is sleeved around the outer perimeter of the shaft sleeve and is disposed corresponding to the bearing set. Therefore, by means of the external ring, the close fit between the shaft sleeve and the bearing set is improved, which increases the assembly precision.