Roller Chain Sealing Structure for Low-Friction Lubricant Retention
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Solution Overview
Problem
Conventional roller chains experience inefficient mechanical force transmission and premature wear of oil sealing rings due to frictional movement between link units during operation, leading to lubricant leakage.
Innovation Solution
The roller chain design incorporates inner and outer link units with specific surface features and sealing rings that are compressed within annular retaining spaces, reducing friction and preventing lubricant leakage by maintaining the sealing rings in a slightly compressed state, thereby enhancing mechanical force transmission efficiency and service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the oil sealing ring is tightly fitted between the outer and inner chain plates to prevent lubricant leakage, then the sealing performance is improved, but the friction between the sealing ring and chain plates increases causing inefficient mechanical force transmission and premature wear
Solution Approach 1:
The patent divides the sealing structure into multiple components: the sealing ring is segmented from the chain plates, and the retaining space is segmented as a distinct cavity within the outer chain plate. This segmentation allows the sealing ring to be contained within a dedicated space rather than being compressed between moving chain plates, reducing friction while maintaining sealing effectiveness.
Solution Approach 2:
The sealing ring is nested within the annular retaining space formed in the outer chain plate, creating a nested structure where the sealing ring resides inside a dedicated cavity. This nesting arrangement allows the sealing ring to maintain contact with the chain plate surfaces for sealing while being protected from excessive compression and friction during operation.
2Reliability
If the oil sealing ring is tightly fitted between the outer and inner chain plates to prevent lubricant leakage, then the sealing performance is improved, but the wear of the sealing ring increases reducing its service life
Solution Approach 1:
The patent segments the sealing function from the structural function by placing the sealing ring within a dedicated retaining space in the outer chain plate, rather than having it compressed between moving chain plates. This segmentation reduces the wear burden on the sealing ring while maintaining its sealing capability.
Solution Approach 2:
The annular retaining space acts as an intermediary structure that houses the sealing ring and mediates between the sealing requirement and the wear reduction goal. This intermediate cavity allows the sealing ring to perform its sealing function without being subjected to excessive compression and friction from the relative movement of chain plates.
3Reliability
If the sealing ring is compressed to prevent lubricant leakage, then the sealing performance is improved, but the friction between the sealing ring and link plates increases
Solution Approach 1:
The patent segments the sealing environment from the external chain plate interfaces by creating an internal retaining space. The sealing ring is compressed only against the stationary walls of this retaining space rather than against the moving chain plates, thereby maintaining sealing performance while minimizing friction-generated harmful effects.
Solution Approach 2:
The annular retaining space serves as an intermediary cavity that isolates the sealing ring from the high-friction environment of the chain plate interfaces. This intermediate structure allows the sealing ring to be compressed for sealing effectiveness while being shielded from the harmful friction caused by the relative motion of the chain links.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design significantly reduces friction between sealing rings and link plates, improves mechanical force transmission efficiency, and extends the service life of the roller chain while minimizing dust and debris entry.
Implementation Method 1
Each of the sealing rings is disposed in a respective one of the retaining spaces in the outer chain plates
Data Source
AI summary
A roller chain includes a plurality of inner and outer link units and a plurality of sealing rings. Each inner link unit includes two inner chain plates and two bushings. Each outer link unit interconnects an adjacent pair of the inner link units, and includes two outer chain plates and two connecting rods. Each of the outer chain plates has two inner surrounding surface portions each partially defining a retaining space. Each of the sealing rings is disposed in a respective one of the retaining spaces in the outer chain plates.