Conveyor Shaft Mounting Structure With Split Bearing and Drive Fits
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Solution Overview
Problem
Existing mounting structures for bearings and power transmitters on the rotation shaft of a conveying screw in image forming apparatuses require strict dimensional tolerances, leading to increased manufacturing costs and difficulty in processing.
Innovation Solution
A mounting structure for a rotation shaft with a first portion having a circular cross-section and a second portion with a non-circular cross-section, where the bearing is rotatably supported on the first portion and the power transmitter is engaged with the second portion, allowing for relaxed dimensional tolerances while maintaining secure mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If strict dimensional tolerances are applied to the rotation shaft for mounting bearing and power transmitter, then secure attachment is achieved, but manufacturing cost increases and processing difficulty increases
Solution Approach 1:
The rotation shaft is divided into two distinct portions: a first portion with a circular cross-section for mounting the bearing, and a second portion with a non-circular cross-section for mounting the power transmitter. This segmentation allows each portion to have optimized dimensional tolerances suitable for its specific function, rather than requiring the entire shaft to meet strict tolerances uniformly.
Solution Approach 2:
Different portions of the rotation shaft have different cross-sectional geometries (circular vs. non-circular) tailored to their specific mounting requirements. The first portion has a circular cross-section with tolerances optimized for bearing mounting, while the second portion has a non-circular cross-section with tolerances optimized for power transmitter engagement, allowing relaxed tolerances in areas where strict tolerances are not critical.
2Reliability
If strict dimensional tolerances are applied to the rotation shaft, then secure attachment is achieved, but processing difficulty increases
Solution Approach 1:
The rotation shaft is divided into two distinct portions: a first portion with a circular cross-section for mounting the bearing, and a second portion with a non-circular cross-section for mounting the power transmitter. This segmentation allows each portion to have optimized dimensional tolerances suitable for its specific function, rather than requiring the entire shaft to meet strict tolerances uniformly.
Solution Approach 2:
Different portions of the rotation shaft have different cross-sectional geometries (circular vs. non-circular) tailored to their specific mounting requirements. The first portion has a circular cross-section with tolerances optimized for bearing mounting, while the second portion has a non-circular cross-section with tolerances optimized for power transmitter engagement, allowing relaxed tolerances in areas where strict tolerances are not critical.
Data Source
AI summary
A mounting structure includes a rotation shaft, a bearing, and a power transmitter. The rotation shaft is of a conveyor that conveys powder. The rotation shaft has a first portion and a second portion. The first portion has a first outer circumferential surface. The second portion is adjacent to the first portion in an axial direction of the rotation shaft and has a second outer circumferential surface inside the first outer circumferential surface of the first portion in a cross-section orthogonal to the axial direction. The second outer circumferential surface has a non-circular cross section. The bearing is on the first portion of the rotation shaft and rotatably supports the rotation shaft. The power transmitter covers a part of the first outer circumferential surface of the first portion and is engaged with the second outer circumferential surface of the second portion to transmit a rotational force to the rotation shaft.