Planar Bearing Joint Seal Assembly for Axial Load Resistance
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Solution Overview
Problem
Planar joints are not suitable for suspension applications due to their inability to resist axial or conical loads and are prone to dust and debris contamination in severe environments.
Innovation Solution
A planar joint assembly with a hollow shaft, integrated washer, self-lubricated thrust and bearing sleeves, and a dual-seal system comprising PTFE lip seals and felt seals, secured by retaining rings, to provide axial load resistance and environmental protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If planar joints are used for sliding, rotating, or oscillating motion, then they provide basic joint functionality, but they cannot resist axial or conical loads and are prone to contamination
Solution Approach 1:
The planar joint is divided into multiple functional components: bearing sleeves for motion, thrust bearings for axial load resistance, and seal systems for contamination protection. Each component addresses specific functional requirements, transforming a single-purpose joint into a multi-functional assembly suitable for suspension applications.
Solution Approach 2:
The patent employs composite material strategies by combining different bearing materials (self-lubricating materials in bearing sleeves and thrust bearings) and seal materials (lip seals and felt seals) to create an assembly that simultaneously provides motion capability, load resistance, and contamination protection.
2Object-affected harmful factors
If conventional planar joints are used, then the structure remains simple, but they lack the capability to resist dust and debris under severe applications
Solution Approach 1:
Seal systems are pre-installed within the joint assembly before deployment, with lip seals positioned to prevent dust entry and felt seals providing additional protection. This preliminary sealing action ensures contamination protection is inherent to the joint design rather than requiring additional protective measures.
Solution Approach 2:
Lip seals with flexible sealing lips create dynamic seals that maintain contact with moving surfaces, while felt seals provide flexible filtration. These flexible sealing elements adapt to minor misalignments and wear, maintaining effective sealing throughout the joint's operational life.
3Force
If self-lubricated thrust bearings and bearing sleeves are added to resist axial loads, then load resistance improves, but device complexity increases
Solution Approach 1:
Thrust bearings and bearing sleeves are integrated into a unified bearing assembly that handles both axial and radial loads simultaneously. The bearing sleeves provide radial load support while thrust bearings handle axial loads, creating a combined load-bearing system that functions as a cohesive unit within the joint.
Solution Approach 2:
Self-lubricated bearing materials are incorporated into the thrust bearings and bearing sleeves, providing automatic lubrication through material properties rather than external lubrication systems. This self-service capability maintains load resistance performance without requiring additional lubrication infrastructure.
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 effectively supports pivotally connected components in suspension systems by resisting axial and conical loads while maintaining cleanliness, ensuring reliable operation in harsh conditions.
Implementation Method 1
A pair of self-lubricated thrust bearings are disposed against the integrated washer on respective opposite sides. A pair of self-lubricated bearing sleeves are adjacent to a respective one of the pair of thrust bearings.
Implementation Method 2
A seal system is received in a cavity in each of the pair of threaded washers. The seal system includes a first seal including a lip seal. The lip seal is made from PTFE or a similar material appropriate for the intended environment of use. The first seals include a garter spring or a similar solution disposed against the lip seal. The seal system includes a second seal that includes a felt seal.
Data Source
AI summary
A planar joint for pivotally supporting an arm to a support structure includes an outer sleeve with a shaft extending through the outer sleeve and including an integrated washer extending radially outward from a central portion thereof. A pair of thrust bearings disposed against the integrated washer on respective opposite sides. A pair of bearing sleeves are adjacent to a respective one of the pair of thrust bearings. A pair of threaded washers are threadedly engaged within respective opposite ends of the outer sleeve. A pair of seals are received in a cavity in a respective one of the pair of threaded washers. A pair of retaining rings are received in an opening end of the cavity of a respective one of the pair of threaded washers for securing the seals within the respective threaded washers.