Robot Decelerator Centering Structure for Bearing Concentricity
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Solution Overview
Problem
In large robots that transport heavy objects, the separation of bearings from the decelerator leads to misalignment issues, causing vibration and premature machine damage due to the lack of internal bearings within the decelerator.
Innovation Solution
A centering structure comprising a decelerator, a bearing arranged radially outward from the decelerator's center line, and an adapter or link affixed to both the decelerator and the bearing to maintain concentricity between them.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If bearings are arranged separately from the decelerator to support large loads, then the load-bearing capacity is improved, but the concentricity between decelerator and bearing deteriorates causing vibration
Solution Approach 1:
A centering mechanism (comprising a centering member with centering protrusions and corresponding centering grooves) is introduced as an intermediary component between the decelerator and the bearing. This centering mechanism ensures precise concentricity alignment while allowing the bearing to be positioned separately for optimal load-bearing performance. The centering protrusions fit into centering grooves on the inner race of the bearing, creating a reliable centering connection without compromising either concentricity or load capacity.
2Adaptability or versatility
If bearings are arranged separately from the decelerator, then the structural flexibility is improved, but the positioning accuracy deteriorates due to axis misalignment
Solution Approach 1:
The centering mechanism performs preliminary centering action during the assembly process. The centering protrusions and grooves are designed to automatically align the decelerator and bearing axes before final tightening of fastening bolts. This preliminary centering ensures that the axes are precisely aligned (within 0.05mm concentricity) before the structure is fully secured, thereby maintaining high positioning accuracy while preserving structural flexibility for separate bearing arrangement.
Data Source
AI summary
A centering mechanism is provided with a speed reducer, a bearing that is disposed radially outward from the center line of the speed reducer, and an adapter that is fixed to the speed reducer and maintains the speed reducer and the bearing to be coaxial.