Motor Bearing Assembly Sequencing to Avoid Axial Friction
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Solution Overview
Problem
The existing assembling process of electric motors results in friction resistance between the bearing inner and outer rings, leading to potential damage and reduced service life due to opposite forces in the axial direction during the assembly of the bearing with the housing.
Innovation Solution
An electric motor assembling device with a lifting mechanism, pressure mechanism, and press head mechanism, controlled by a control mechanism, is used to apply forces in a manner that avoids stressing the bearing inner ring, ensuring the bearing outer ring is press-fitted into the housing without stressing the inner ring, and the rotor shaft is assembled with the inner ring without opposing forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the bearing is assembled with the housing using conventional methods, then the bearing outer ring can be press-fitted into the housing, but friction resistance is generated between the rotor shaft and bearing inner ring due to opposite forces in the axial direction
Solution Approach 1:
The patent segments the bearing assembly process into two distinct stages: first assembling the bearing outer ring with the housing, then assembling the rotor shaft with the bearing inner ring. This segmentation allows independent control of forces applied to each component, preventing the generation of opposite axial forces that cause friction resistance.
Solution Approach 2:
The patent applies preliminary action by first completing the bearing outer ring to housing assembly before introducing the rotor shaft. The housing and bearing outer ring are pre-assembled and positioned, then the rotor shaft is subsequently introduced without creating conflicting axial forces on the bearing inner ring.
2Strength
If the bearing outer ring is press-fitted into the housing, then the assembly is secured, but opposite forces are generated on the bearing inner ring and outer ring in the axial direction leading to potential bearing damage
Solution Approach 1:
The patent divides the assembly process into separate stages where the bearing outer ring is first secured to the housing, and then the rotor shaft is assembled to the bearing inner ring. This segmentation ensures that each assembly action applies force to only one component at a time, preventing opposite axial forces that could damage the bearing.
Solution Approach 2:
The housing and bearing outer ring are pre-assembled and secured before the rotor shaft introduction. This preliminary action establishes a stable base without creating stress on the bearing inner ring, ensuring both assembly stability and bearing reliability.
3Productivity
If the bearing is assembled in one step with both the housing and rotor shaft, then the process is faster, but friction resistance is generated reducing the service life of the bearing
Solution Approach 1:
The patent segments the assembly process into two sequential but efficient stages: bearing outer ring with housing, then rotor shaft with bearing inner ring. This segmentation eliminates friction resistance while maintaining productivity through streamlined sequential operations rather than simultaneous complex operations.
Solution Approach 2:
The patent maintains continuity of useful action by seamlessly transitioning from the first assembly stage to the second without interruption. The bearing outer ring is first secured to the housing, then the rotor shaft is immediately introduced to the bearing inner ring, keeping the assembly process continuous and efficient while avoiding harmful friction resistance.
Data Source
AI summary
An electric motor assembling device includes a lifting mechanism, a pressure mechanism, a press head mechanism, an assembling station and a control mechanism. The pressure mechanism is located at one side of the assembling station, and the lifting mechanism and the press head mechanism are located at the other side of the assembling station. The pressure mechanism includes a pressure mechanism body and a pushing portion connected with the pressure mechanism body, and the pushing portion is configured to be pushed into the assembling station relative to the pressure mechanism body. The press head mechanism includes an abutting portion at a side facing the assembling station. The lifting mechanism includes a clamping portion at a side facing the assembling station, and the clamping portion is configured to move in a direction running away from the assembling station relative to the press head mechanism.