Robot Speed Reducer Coupling for Falling-Off Prevention
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Solution Overview
Problem
Existing falling-off prevention devices for transmissions in industrial robots are inadequate, as they may fail to prevent the transmission from falling off even when the recess on the robot side is damaged, necessitating a more secure solution, especially in robots that work closely with humans.
Innovation Solution
A transmission with a falling-off prevention feature that includes a coupling member, shaped like a string, which maintains coupling between the transmission and the mating member, even during displacement, eliminating the need for special designs like projections on the hold flange, thereby enhancing design flexibility and versatility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a recess is provided in the plate on the robot side to prevent transmission falling off, then the transmission can be retained on the robot, but the retention fails when the recess or casing is damaged
Solution Approach 1:
A coupling member is introduced as an intermediary component between the transmission and the robot plate. This coupling member includes a first coupling member fixed to the transmission casing and a second coupling member fixed to the robot plate, connected by a flexible coupling portion. This intermediary structure provides redundant retention paths, so if one connection point fails, the flexible coupling portion can compensate and maintain the connection, significantly improving retention reliability without requiring complex modifications to the original recess structure
2Reliability
If a projection is provided on the hold flange of the transmission casing to prevent falling off, then the transmission can be secured to the robot, but additional processing is required on the transmission
Solution Approach 1:
The falling-off prevention function is segmented from the transmission casing itself and transferred to a separate coupling member. The first coupling member is fixed to the transmission casing using standard fixing members, while the second coupling member attaches to the robot plate. This segmentation allows the transmission casing to maintain its original simple structure without requiring additional projections or modifications, while still achieving secure attachment through the separate coupling mechanism
3Stability of the object's composition
If the transmission is securely coupled to the mating member to prevent displacement, then the transmission remains fixed during operation, but the coupling must accommodate potential displacement without failing
Solution Approach 1:
The coupling member incorporates a flexible coupling portion that can dynamically adapt to displacement between the transmission and robot plate. This flexible portion allows the coupling to maintain stability during normal operation while automatically compensating for any relative displacement or misalignment that occurs, ensuring the coupling remains intact and functional under varying operational conditions
Data Source
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AI summary
A speed reducer (100) with a falling-off prevention feature according to an aspect of the invention includes: a speed reducer (1) for decelerating rotation from a drive source that generates a rotational force and outputting the decelerated rotation, the speed reducer (1) being mounted to a robot; and a coupling member (51, 52, 53) for coupling the speed reducer (1) to the robot. The coupling member (51, 52, 53) maintains coupling between the speed reducer (1) and the robot (R) irrespective of displacement of the speed reducer (1) relative to the robot (R).