PTFE Sliding Bearing Composite for Paint-Resistant Insulation
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Solution Overview
Problem
Electrically conductive paint particles can deposit on the axial end face and gap between the sleeve-shaped holder and shaft section in plain bearing arrangements, disrupting their operation, especially when immersed in an electrically conductive paint bath.
Innovation Solution
A plain bearing composite material with a polymer base of PTFE and fillers comprising 10-25 wt.% glass fibers and 5-15 wt.% wollastonite and/or fly ash, with a ratio of 1:1 to 2:1, ensuring electrical insulation and reducing paint particle deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If electrically conductive fillers (such as graphite) are used in the sliding layer material to improve electrical conductivity, then electrical conductivity is improved, but paint particles deposit on the bearing surfaces and disrupt operation
Solution Approach 1:
The patent changes the electrical conductivity parameter of the sliding layer material by replacing electrically conductive graphite fillers with electrically insulating glass fibers and wollastonite. This parameter change prevents the electrostatic attraction that causes paint particle deposition, while the patent accepts the trade-off of reduced electrical conductivity in the bearing material.
Solution Approach 2:
The patent applies local quality by creating an electrically insulating surface layer (the sliding layer) that specifically addresses the paint deposition problem at the bearing surfaces, while the underlying metallic support layer retains its electrical conductivity for structural purposes. This localized insulation prevents paint particles from depositing on the sliding surfaces during electrophoretic painting.
2Strength
If glass fibers are used as fillers to improve mechanical strength, then strength is improved, but abrasiveness increases which may worsen friction and wear
Solution Approach 1:
The patent uses composite materials by combining glass fibers (for strength) with wollastonite (for reduced abrasiveness and improved friction behavior). This composite filler system balances the contradictory requirements of high mechanical strength and low abrasiveness, creating a sliding layer that is both strong and suitable for sliding applications.
Solution Approach 2:
The patent applies local quality by using glass fibers specifically for their reinforcing effect in the sliding layer structure, while compensating for their abrasive nature through the addition of wollastonite. The local combination of these fillers creates zones of different properties within the sliding layer to balance strength and friction characteristics.
3Object-affected harmful factors
If the sliding layer material is made electrically insulating to prevent paint deposition, then paint particle deposition is reduced, but electrical conductivity for certain applications is reduced
Solution Approach 1:
The patent applies local quality by creating an electrically insulating surface layer (the sliding layer) that specifically addresses the paint deposition problem at the bearing surfaces, while the underlying metallic support layer retains its electrical conductivity for structural purposes. This localized insulation prevents paint particles from depositing on the sliding surfaces during electrophoretic painting.
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 effectively prevents paint particle deposition, maintaining the integrity of the plain bearing arrangement by keeping the shaft section insulated, thus ensuring reliable operation during paint coating.
Implementation Method 1
the sliding layer material and thus of the sliding layer, deposits on or at a usually metallic shaft section that is already inserted into the sleeve-shaped holder are either not at all or are reduced. The shaft section is held in the sleeve-shaped holder in a virtually electrically insulated manner
Implementation Method 2
the polymer base is formed from PTFE... wollastonite and/or fly ash also increases the strength and wear resistance of the sliding layer material while simultaneously exhibiting favorable friction behavior
Data Source
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AI summary
The invention relates to a plain bearing composite material (8), comprising: - a metal support layer (18), more particularly made of steel; - a sliding layer (20) made of a sliding layer material (22) having a polymer basis with fillers (23), the sliding layer being applied to the support layer (18) either directly or with the interposition of an adhesion promoter layer, the polymer basis being formed by PTFE, and the fillers (23) being formed by 10-25 wt.% of glass fibers and in total 5-15 wt.% of wollastonite and/or fly ash and optionally up to 5 wt.% of additional fillers, based on the mass of the sliding layer material (22). A ratio of a weight percentage of the glass fibers to a weight percentage of the wollastonite and/or fly ash is between 1:1 and 2:1. A planar square sample of 10.0 mm times 10.0 mm of the edge length of the plain bearing composite material has an electrical resistance measured orthogonally to the planar extent of the plain bearing composite material of at least 107 ohms.