Electric Actuator Bearing Holder Axial Alignment
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Solution Overview
Problem
Existing electric actuators face issues with axial accuracy of the motor shaft due to assembly errors, leading to increased noise and vibration caused by deviations in bearing positions between cases.
Innovation Solution
The electric actuator design includes a bearing holder with a cylindrical part and flange part, where the cylindrical part is inserted into a through hole with a larger inner diameter, allowing for radial adjustment and fixation, ensuring high axial accuracy by aligning the first and second bearings relative to each case, thus stabilizing the motor shaft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If two cases are fixed together to form the electric actuator, then the structural integrity is improved, but assembly errors cause bearing position deviations leading to motor shaft tilting
Solution Approach 1:
The bearing holder acts as an intermediary component between the first case and the motor shaft. It provides a standardized mounting interface that decouples the bearing position from the case assembly, allowing precise bearing positioning independent of case alignment errors.
Solution Approach 2:
The bearing support function is segmented into a separate bearing holder component rather than being integrated directly into the cases. This segmentation allows independent manufacturing and precise assembly of the bearing holder, isolating the bearing position accuracy from case assembly errors.
2Manufacturing precision
If bearing positions are precisely aligned to prevent motor shaft tilting, then axial accuracy is improved, but the assembly complexity increases
Solution Approach 1:
The bearing holder is pre-assembled with the bearings in the correct positions before final assembly with the motor shaft. This preliminary action ensures precise bearing alignment is achieved during the bearing holder fabrication stage rather than requiring complex alignment procedures during final assembly.
Solution Approach 2:
The bearing holder serves as a mediator that simplifies the assembly process by providing pre-positioned bearing mounts, eliminating the need for complex alignment procedures between cases and motor shaft during assembly.
3Strength
If the bearing holder is tightly fitted to the case, then the fixation strength is improved, but adjustment capability for alignment is reduced
Solution Approach 1:
The bearing holder design incorporates adjustable features that allow dynamic positioning during assembly. The holder can be positioned and adjusted to achieve optimal alignment, then secured with fixation elements that provide strong attachment while maintaining the achieved alignment precision.
Data Source
AI summary
An electric actuator includes: a motor; a first case accommodating the motor; a second case located on one side in an axial direction of the first case; a bearing holder fixed to the first case; and a first bearing held by the bearing holder. The first case has a wall part covering the other side in the axial direction of a stator and having a through hole. The bearing holder has: a holder cylindrical part holding the first bearing and inserted into the through hole; and a holder flange part fixed to the wall part. An inner diameter of the through hole is larger than an outer diameter of the holder cylindrical part. At least a part of a radially outer surface of the holder cylindrical part in a circumferential direction is located in a position radially inside and away from a radially inner surface of the through hole.