Driving Apparatus Limiting Member for Grease Intrusion
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Solution Overview
Problem
Conventional driving apparatuses for industrial robots face issues with rotation accuracy due to foreign matter, such as lubricant intrusion, affecting the coupling and detector systems.
Innovation Solution
Incorporating a first limiting member between the reduction gear and coupling, and a second limiting member in the hollow space between the input and output shafts, to prevent foreign matter intrusion and maintain rotation accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a coupling is attached to the tip end of the output shaft to transmit power, then power transmission efficiency is improved, but foreign matter from the reduction gear may intrude into the coupling side, adversely affecting rotation accuracy
Solution Approach 1:
A limiting member is introduced as an intermediary component between the reduction gear and the coupling. This limiting member selectively blocks foreign matter (such as grease) from the reduction gear from intruding into the coupling side, while allowing power transmission to proceed uninterrupted. The limiting member acts as a mediator that protects the coupling system from contamination without interfering with the power transmission function.
2Volume of moving object
If the reduction gear is arranged on one side of the motor with a detector on the other side, then space utilization is improved, but foreign matter intrusion may affect both the coupling and detector systems
Solution Approach 1:
The limiting member divides the internal space into two separate zones: a first space containing the reduction gear where grease is present, and a second space containing the coupling and detector systems. This spatial segmentation prevents cross-contamination between the two zones, allowing the detector system to operate reliably without being affected by foreign matter from the reduction gear, while maintaining compact space utilization.
3Manufacturing precision
If foreign matter is prevented from intruding into the coupling side, then rotation accuracy is improved, but the structure becomes more complex with additional limiting members
Solution Approach 1:
The limiting member is designed as a thin-walled cylindrical structure with simple geometry that fits within the existing hollow space of the driving apparatus. This thin-film-like structure provides effective foreign matter blocking functionality without adding significant structural complexity or occupying excessive space. The simple cylindrical design with open ends allows easy integration into the existing system while maintaining rotation accuracy.
Data Source
AI summary
A driving apparatus has a problem in that foreign matter, such as grease, in a reduction gear moves from the reduction gear to a coupling side. Therefore, a driving apparatus includes an input shaft with a hollow space, a motor that rotates the input shaft, a reduction gear that receives the power of the motor from the input shaft, an output shaft inserted through the hollow space of the input shaft and adapted to rotate about the rotation axis of the motor, and a coupling connected to a tip end of the output shaft. A first limiting member for limiting the movement of foreign matter in the reduction gear toward the coupling side is arranged between the reduction gear and the coupling.