Conductive rubber composition, sealing assembly and rolling bearing

By optimizing the ratio of conductive carbon black, carbon nanotubes, and graphene in conductive rubber, a highly efficient three-dimensional conductive network is formed, which solves the problem of performance degradation of conductive rubber when the filling ratio is inappropriate, achieves a balance between conductivity and mechanical properties, and prevents electrical erosion of bearing raceways.

CN122103792APending Publication Date: 2026-05-29SCHAEFFLER TECHNOLOGIES AG & CO KG
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Patent Information

Application Number
CN202510946852.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-07-09
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

When the filling ratio of existing conductive rubber is not appropriate, it will lead to a decline in the performance of sealing products, especially poor conductivity and mechanical properties, and sensitivity to temperature and voltage, which will affect the sealing ability and service life of bearings.

Method used

A conductive rubber composition consisting of a uniform mixture of conductive carbon black, carbon nanotubes, and graphene is used. By optimizing the ratio of these components in the matrix rubber, a highly efficient three-dimensional conductive network is formed, ensuring low resistivity and good mechanical properties.

Benefits of technology

By balancing conductivity and mechanical properties, it can effectively prevent bearing raceway erosion caused by shaft current or charge accumulation, and improve the stability and fatigue resistance of conductive rubber compositions.

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Abstract

The invention relates to a conductive rubber composition, a sealing assembly and a rolling bearing. The conductive rubber composition comprises matrix rubber, conductive carbon black, carbon nanotubes and graphene, the conductive carbon black, the carbon nanotubes and the graphene are uniformly mixed into the matrix rubber, and the mass part range of the conductive carbon black is 25-55 parts; the mass part range of the carbon nanotubes is 3-5 parts, and the mass part range of the graphene is 2-7 parts. When the conductive rubber composition is prepared from the conductive filler in the mass part range and is applied to the sealing assembly of the rolling bearing, the sealing assembly can continuously and timely release static electricity, and roller path electric erosion of the rolling bearing caused by shaft current or charge accumulation discharge is effectively prevented.
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