Rolling Bearing Grease Composition for Low Torque and Leak Resistance
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Solution Overview
Problem
Existing grease compositions for rolling bearings fail to achieve low torque performance and grease leakage resistance, with diurea-based greases experiencing oil leakage due to shearing and centrifugal forces in larger bearings.
Innovation Solution
A grease composition with a thickener mixture of diurea having specific chemical structures, including alicyclic, alkyl, and phenylene groups, is used, which increases the contact area with base oil and prevents leakage while maintaining low torque performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If grease containing diurea with short-chain aliphatic amine is used to reduce torque, then low torque performance is improved, but grease leakage occurs due to large shearing or centrifugal force in larger bearings
Solution Approach 1:
The invention changes the chemical structure parameters of the diurea thickener by specifying particular R1 and R2 groups (cyclohexyl, heptyl, octyl, nonyl, decyl) and their molecular weights (100-200 Da), optimizing the balance between torque reduction and leakage resistance
Solution Approach 2:
The invention uses a composite grease formulation combining ester base oil (70-85 mass%) with specifically structured diurea thickener (10-20 mass%), creating a material that achieves both low torque and leakage resistance through synergistic composition
2Productivity
If grease composition is optimized for low torque performance, then bearing efficiency is improved, but grease leakage resistance deteriorates
Solution Approach 1:
The invention optimizes physical parameters including base oil viscosity (2-7 cSt at 100°C), thickener content (10-20 mass%), and molecular weight of amine components (100-200 Da) to simultaneously achieve low torque and prevent leakage
Data Source
AI summary
Examples of the ester oil include diester oils such as dibutyl sebacate, dioctyl sebacate, di-2-ethylhexyl sebacate, dioctyl adipate, diisodecyl adipate, ditridecyl adipate, ditridecyl phthalate, and methyl acetyl ricinolate; aromatic ester oils such as trioctyl trimellitate, tridecyl trimellitate, and tetraoctyl pyromellitate; polyol ester oils such as trimethylolpropane caprylate, trimethylolpropane pelargonate, pentaerythritol-2-ethylhexanoate, and pentaerythritol pelargonate; carbonate oil; complex ester oil which is an oligoester of polyhydric alcohol and mixed fatty acid including dibasic acid and monobasic acid; etc.