Self-lubricating Bushing with Integrated Lip Seal
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Solution Overview
Problem
Existing self-lubricating joints in abrasive environments face significant wear issues due to material heterogeneity and the need for additional seals, leading to assembly challenges, non-uniform wear, and increased costs.
Innovation Solution
A self-lubricating articulation ring made of composite material with integrated lips formed during manufacturing, using epoxy or vinyl ester resin reinforced with thermoplastic fibers and lubricating fillers, which acts as a sealing and protective barrier without additional seals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If additional seals are added to protect against abrasive environment, then protection against external aggression is improved, but device complexity and assembly difficulty increase
Solution Approach 1:
The sealing function is merged with the bearing ring itself by integrating a lip directly into the ring structure. This eliminates the need for separate seal components while maintaining the protective barrier against abrasive particles, thus reducing device complexity and assembly steps.
Solution Approach 2:
The bearing ring is designed to perform multiple functions simultaneously: it provides mechanical support, reduces friction through self-lubrication, and protects against abrasive contamination through the integrated lip seal. This multi-functionality eliminates the need for separate protective components.
2Object-affected harmful factors
If heterogeneous materials are used for ring and seal, then sealing function is achieved, but dimensional stability deteriorates due to differential expansion and humidity absorption
Solution Approach 1:
The bearing ring and its integrated lip are made from the same composite material, ensuring uniform physical and chemical properties throughout. This homogeneity eliminates differential thermal expansion and consistent humidity absorption behavior, maintaining dimensional stability while achieving sealing functionality.
3Object-affected harmful factors
If multiple materials are in contact with the shaft, then sealing is achieved, but wear becomes non-uniform
Solution Approach 1:
The entire bearing ring including the sealing lip is constructed from a single homogeneous composite material, ensuring uniform wear characteristics across all contact surfaces with the shaft. This eliminates the non-uniform wear patterns that occur when dissimilar materials are in contact.
Solution Approach 2:
A composite material combining thermoplastic fibers with self-lubricating fillers is used to create a homogeneous structure that provides both sealing capability and uniform wear resistance. The composite nature allows optimization of both sealing and wear properties within a single material system.
4Object-affected harmful factors
If additional seals are attached to the ring, then protection against external attacks is improved, but manufacturing cost increases
Solution Approach 1:
The sealing function is combined with the bearing ring manufacturing process itself. The lip is formed as an integral part of the ring during molding, eliminating the need for separate seal components and their associated manufacturing, inventory, and assembly costs.
Solution Approach 2:
The bearing ring is designed to perform multiple functions including sealing, support, and self-lubrication within a single component. This reduces the total number of parts that need to be manufactured, stocked, and assembled, thereby lowering overall manufacturing costs.
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 composite material ring with integrated lips provides effective anti-abrasion protection, reduces wear, and lowers assembly and maintenance costs, while ensuring homogeneity and compatibility with various environments, extending lifespan and reducing noise pollution.
Implementation Method 1
The composite material, constituting the body of the ring, has a modulus of elasticity of between 500 and 6000 N/mm2. This composite material is an epoxy or vinyl ester or polyester resin reinforced with thermoplastic fibers with a thickness of between 0.05 mm and 0.5 mm, and incorporating lubricating fillers between 5 and 50% of the volume.
Implementation Method 2
The composite material, constituting the body of the ring, has a modulus of elasticity of between 500 and 6000 N/mm2
Data Source
Figure 1~5
AI summary
This bushing is made of a composite material having an elastic modulus of between 500 and 6000 N/mm2, said bushing having at least one lip (1a) formed directly at the time of its manufacture to overhang its bore (1b) to act as a sealing or protective barrier once it has been mounted on the shaft (2), thereby creating a clamping effect between the inside diameter of said lip (1a) or said lips, and the outside diameter of said shaft (2).