Robot Reducer Sealing Structure for Looseness-Resistant Assembly
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Solution Overview
Problem
Existing robot sealing structures face challenges in reliably forming a seal between the shaft of a reducer and an arm member, particularly due to issues with fastening looseness and the cost of forming complex O-ring grooves that do not extend circularly around the center axis.
Innovation Solution
A robot sealing structure that includes a recessed flat portion on the shaft end face and attachment surface, continuous over the entire circumference, with a seal member disposed on this recessed area, and temporary-fixing members to ensure secure positioning and sealing, reducing the need for complex grooves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a packing is made to intervene around a cover of an arm member to form a seal, then sealing is achieved, but fastening looseness occurs and the structure becomes complex
Solution Approach 1:
The invention extracts the sealing function from a complex packing-based system and implements it through a simple groove structure with an O-ring, eliminating the need for complex intervention packings while maintaining sealing reliability
Solution Approach 2:
The O-ring serves as a flexible sealing element that fits into the groove, providing reliable sealing through its elastic deformation capability while keeping the overall structure simple
2Reliability
If an O-ring is used to form a seal between the reducer and arm member, then sealing is achieved, but complex O-ring grooves that do not extend circularly are required
Solution Approach 1:
The groove is designed with asymmetric positioning relative to the shaft centerline, allowing the O-ring to be effectively positioned without requiring a full circular groove, thus simplifying manufacturing
Solution Approach 2:
The groove is pre-formed in the shaft end face at a specific position, allowing the O-ring to be installed in advance before final assembly, which simplifies the overall manufacturing process
3Ease of operation
If simple surface contact is used between shaft and arm member, then assembly is simple, but fastening looseness occurs
Solution Approach 1:
The contact surface is segmented into multiple functional zones: a sealing zone with the O-ring groove, a bearing zone for load distribution, and a fastening zone with bolt holes, allowing simple assembly while preventing looseness through distributed contact points
Data Source
AI summary
A robot sealing structure including a shaft end face of a reducer, an attachment surface of an arm member that is to be in surface contact with the shaft end face, a number of bolts that fix the shaft and the arm member to each other in a state in which the shaft end face and the attachment surface are in surface contact; a recessed flat portion that is provided in part of one of the shaft end face and the attachment surface, and a seal member that is disposed on the recessed flat portion, where the recessed flat portion is a portion recessed in a direction along the center axis line of the shaft, with respect to the shaft end face or the attachment surface, and the recessed flat portion is continuous over an entire circumference around the center axis line.