Self-lubricating Composite Hinge Assembly for High Dynamic Loads
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing self-lubricating ball joints made of composite polymers fail to provide adequate load resistance and are prone to creep and delamination under dynamic loads greater than 40 MPa, with issues of seizing between the sphere and axis, and limited durability under heavy loads.
Innovation Solution
A self-lubricating joint made from a thin fabric winding mixed with resin and fillers, applied using the filament winding technique with crossed layers for enhanced homogeneity and resistance, and a self-lubricating coating on the bore and periphery to prevent seizing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If composite polymer joints are used for self-lubricating operation, then ease of operation is improved, but load resistance deteriorates under dynamic loads greater than 40 MPa
Solution Approach 1:
The patent uses a composite material consisting of a fabric reinforcement (glass, carbon, or aramid fibers) combined with a polymer matrix containing solid lubricants (PTFE, MoS2, graphite). This composite structure provides both the self-lubricating properties needed for ease of operation and the mechanical strength required to withstand dynamic loads greater than 40 MPa, resolving the contradiction between ease of operation and load resistance.
2Ease of operation
If composite polymer joints are used to enable self-lubricating operation, then ease of operation is improved, but reliability deteriorates due to creep and delamination risks
Solution Approach 1:
The fabric reinforcement embedded in the polymer matrix creates a composite structure that prevents creep deformation and delamination. The fabric provides structural integrity while the polymer matrix with solid lubricants maintains self-lubricating properties, ensuring both ease of operation and reliability under dynamic conditions.
Solution Approach 2:
The patent applies different materials with specific local functions: the fabric provides structural stability to prevent creep, the polymer matrix provides toughness and flexibility, and the solid lubricant particles provide low friction. This local differentiation of material properties ensures both ease of operation through self-lubrication and reliability by preventing delamination and creep.
3Manufacturing precision
If thin fabric winding is used with crossed layers, then manufacturing precision is improved for homogeneity, but device complexity increases
Solution Approach 1:
The patent specifies precise parameter ranges for the fabric winding process, including fabric thickness (20-150 μm), strip width (5-200 mm), and crossing angles (10°-90°, preferably 30°-86°). By controlling these parameters, the process achieves high homogeneity and manufacturing precision while the standardized parameter ranges make the process reproducible and manageable, balancing precision with process complexity.
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 provides improved resistance to both dynamic and static loads, prevents seizing, and allows for easy dismantling, with the crossed fabric layers and fillers enhancing the joint's ability to operate under high contact pressures greater than 40 MPa.
Implementation Method 1
self-lubricating joint made from a thin fabric winding mixed with resin and fillers... self-lubricating coating on the bore and periphery to prevent seizing
Implementation Method 2
The desired aim is to avoid any seizing effect... self-lubricating operation
Implementation Method 3
winding of a thin fabric between 20 μm and 150 μm and preferably between 20 μm and 130 μm and preferably between 20 μm and 130 μm and mixed with a resin comprising fillers
Data Source
Figure 1~2
AI summary
This assembly comprising a ball (1) mounted in a cage (2), said ball (1) receiving, with the ability to slide and/or rotate, a pin (3). This ball is made from a winding of a thin fabric between 20 µm and 150 µm thick and mixed with a resin comprising fillers, said fabric being in the form of strips between 5 mm and 200 mm wide, said bands being crossed in several layers.