Rotation Transmission Device Stabilizing Shaft Alignment
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Solution Overview
Problem
The rotation transmission device experiences misalignment between the input and output shafts when the housing is not fixed with a flange, leading to unstable behavior of the engaging elements between the inner and outer rings, causing rollers to engage or disengage improperly.
Innovation Solution
The addition of a fourth bearing between the inner and outer rings, or between the housing and output shaft, stabilizes the axes of the input and output shafts, preventing misalignment and ensuring stable behavior of the engaging elements without the need for a flange fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the housing is not fixed with a flange to enhance design flexibility, then the device complexity is reduced and design freedom is improved, but misalignment occurs between the input and output shafts causing unstable behavior of engaging elements
Solution Approach 1:
A fourth bearing is introduced as an intermediary component between the existing three bearings to support the output shaft. This additional bearing acts as a mediator that prevents misalignment between the input and output shafts, ensuring stable engagement of the rollers with the cam surfaces while allowing the housing to remain unfixed for design flexibility.
2Device complexity
If only three bearings are used to support the input and output shafts, then the device complexity is reduced, but misalignment occurs between the shafts leading to improper engagement of rollers
Solution Approach 1:
Instead of using exactly three bearings (which causes misalignment), a fourth bearing is added to provide excessive support points. This partial excess of bearing components ensures that the output shaft is supported at four locations rather than three, thereby achieving precise alignment and preventing misalignment between the input and output shafts.
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
A rotation transmission device is provided of which a housing needs not be fixed in position by a flange, and of which engaging elements between an inner ring and an outer ring are stable in behavior. The rotation transmission device (M) includes the inner ring (3), which is provided on an input shaft (1), the outer ring (4), which is provided on an output shaft (2), rollers (5a and 5b) mounted between the inner periphery of the outer ring (4) and the outer periphery of the inner ring (3), an electromagnet (32), as a driving source for moving a roller retainer (6), mounted at the end portion of the housing (10) on the side of the input shaft (1), a first bearing (51) mounted between the electromagnet (32) and the input shaft (1), a second bearing (52) mounted between the end portion of the housing (10) on a side of the output shaft (2) and the output shaft (2), and a third bearing (53) mounted between the inner ring (3) and the outer ring (4). The rotation transmission device further includes a fourth bearing (54) configured to prevent inclination of the axes of the input shaft (1) and the output shaft (2) relative to each other.