Motor Thrust Bearing Assembly with Elastic Sealing
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Solution Overview
Problem
Conventional motors with thrust bearings have complex assembly processes, leading to issues like oil leakage, high operation noise, and increased manufacturing costs due to the need for precise alignment and sealing, resulting in poor oil preservation and short lifetimes.
Innovation Solution
A motor design featuring a base with a bearing sleeve having opposite opening and sealing ends, a stator connected to the base, and a rotating member with a shaft and limiting portion, where the thrust bearing is positioned between the shaft and the bearing sleeve, allowing for simple assembly by inserting the rotating member and thrust bearing into the bearing sleeve and coupling the hub with the shaft, thereby preventing disengagement and ensuring effective sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the bearing housing has two opposite openings to allow rotor extension and lid coupling, then assembly is enabled, but oil leakage occurs through the gap between lid and opening edge
Solution Approach 1:
The invention extracts the sealing function from the lid structure and relocates it to the bearing housing opening edge through an elastic sealing ring. This separates the structural support function (lid) from the sealing function (elastic ring at opening edge), allowing the lid to be simple while maintaining effective sealing at the critical oil-containing chamber boundary.
Solution Approach 2:
An elastic sealing ring is introduced as an intermediary element between the bearing housing opening edge and the external environment. This elastic ring mediates the sealing function, compensating for dimensional tolerances and preventing oil leakage without requiring precise fitting between the lid and opening edge.
2Ease of manufacture
If the shaft and pushing board are connected inside the thrust bearing through opposite openings, then the connection can be made, but the assembly process becomes complex and difficult
Solution Approach 1:
Instead of connecting the shaft and pushing board through the thrust bearing from opposite sides (conventional approach), the invention inverts the sequence by first connecting the shaft to the pushing board externally, then assembling the complete rotor assembly into the bearing housing as a unit. This reverses the assembly logic from internal connection to external connection followed by unit assembly.
Solution Approach 2:
The invention merges the shaft and pushing board connection process to occur outside the bearing housing, combining these components into a pre-assembled rotor unit. This merging of connection operations outside the constrained bearing space simplifies the overall assembly process and eliminates the difficulty of internal alignment and connection.
3Manufacturing precision
If multiple assembly steps are required for the motor, then proper positioning is achieved, but the assembly time and manufacturing cost increase
Solution Approach 1:
The invention applies preliminary action by pre-assembling the rotor components (shaft, pushing board, and hub) outside the bearing housing before final installation. This preliminary assembly ensures proper positioning and connection of critical components while allowing easier access for adjustments, thereby reducing the number of steps required during final motor assembly.
Solution Approach 2:
The motor assembly is segmented into modular units: the rotor assembly (shaft, pushing board, hub) as one module, the stator assembly as another module, and the bearing housing as the housing module. This segmentation allows each module to be prepared independently with proper positioning, then assembled together quickly, improving both precision and productivity.
Data Source
AI summary
A motor includes a base, a bearing sleeve, a stator, a rotating member, a thrust bearing, and a hub. The bearing sleeve is arranged with the base and has an opening end and a sealing end opposite to each other. The stator connects with the base or the bearing sleeve. The rotating member is arranged inside the bearing sleeve and includes a shaft and a limiting portion adjacent to the sealing end. A first end of the shaft connects with the limiting portion, and a second end of the shaft has a coupling portion adjacent to the opening end. The thrust bearing is arranged between the shaft and an inner surface of the bearing sleeve, so that the limiting portion is between the thrust bearing and the sealing end. The hub connects with the coupling portion of the shaft and has a permanent magnet corresponding to the stator.