Sealed Self-Lubricating Roller Chain for Continuous Operation
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Solution Overview
Problem
Existing roller chain lubrication methods require periodic stopping of the chain for manual lubrication, and automatic systems risk contaminating products being transported.
Innovation Solution
A self-lubricating roller chain design featuring sintered bushes impregnated with lubricant, which release lubricant during motion, and seals to prevent foreign material ingress, allowing for continuous operation and reduced maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual lubrication is performed during regular maintenance, then the roller chain can be lubricated, but the roller chain must be stopped periodically which reduces productivity
Solution Approach 1:
The bush is designed with self-lubricating properties through sintering and impregnation with lubricant. The porous structure of the sintered bush automatically releases lubricant during operation, eliminating the need for external lubrication systems or manual intervention. This self-service mechanism ensures continuous operation without periodic stopping for lubrication maintenance
Solution Approach 2:
The lubricant is pre-impregnated into the sintered bush during manufacturing, creating a reservoir of lubricant that is released progressively during operation. This preliminary action of impregnating the bush with lubricant before installation ensures that lubrication is automatically provided during chain operation without requiring external lubrication systems
2Productivity
If automatic lubrication systems are used to lubricate the roller chain during operation, then productivity is maintained, but there is a risk that lubricant will contact and damage the products being transported
Solution Approach 1:
The lubrication function is extracted from the external automatic lubrication system and integrated directly into the bush itself through sintering and impregnation. This eliminates the need for external lubricant application systems that could potentially contaminate products, as the lubricant is contained within the bush structure and released only where needed at the friction interface
Solution Approach 2:
The sintered bush acts as an intermediary between the lubricant and the friction surfaces. The lubricant is impregnated into the porous structure of the bush and released gradually at the contact interface, providing lubrication without requiring external application systems that could contaminate products. The bush mediates the lubrication process, ensuring lubricant is delivered only where friction occurs
3Device complexity
If traditional non-sintered bushes are used, then the structure is simpler, but frequent lubrication maintenance is required which increases maintenance costs
Solution Approach 1:
The bush is manufactured using sintering to create a porous structure that can impregnate and retain lubricant. This porous material allows the bush to automatically release lubricant during operation, eliminating the need for external lubrication systems and reducing maintenance frequency. The porous structure is integral to the bush's self-lubricating function
Solution Approach 2:
The bush combines sintered material with impregnated lubricant to create a composite structure with self-lubricating properties. This composite material approach integrates the lubrication function directly into the bush, eliminating the need for separate lubrication systems and reducing maintenance requirements while maintaining structural integrity
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
The solution enables continuous operation of roller chains without the need for frequent lubrication stops, reduces the risk of lubricant contamination of transported products, and provides a long-lasting, maintenance-free solution.
Implementation Method 1
The bush is sintered and impregnated with a lubricant
Implementation Method 2
The bush, sintered and impregnated with a lubricant, releases lubricant while the roller chain is in motion, thus lubricating the interface between the pin and the bush
Implementation Method 3
The first seal and the second seal act as a protective barrier against the ingress of foreign material, such as dust and other dirt particles, between the bush and the pin
Data Source
AI summary
A roller chain includes a bush having first and second ends, a pin extending through the bush and having first and second ends projecting from the bush, a roller supported by an outer surface of the bush, a first inner link having an opening mounted on the first end of the bush and a second inner link having an opening mounted on the second end of the bush, a first outer link having an opening mounted on the first end of the pin and a second outer link having an opening mounted at the second end of the pin, and a first seal body axially mounted between the first inner link and the first outer link and a second seal body axially mounted between the second inner link and the second outer link, wherein the bush comprises a sintered cylinder impregnated with a lubricant.