Traction Fluid Formulation Balancing Shear Strength and Cold Flow
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing traction fluids do not adequately balance high shear strength for torque transmission with low temperature fluidity, particularly in continuous variable transmission systems, leading to inefficiencies in engine performance and fuel efficiency.
Innovation Solution
A traction fluid blend comprising specific base oils and additives, including viscosity modifiers, anti-foaming agents, and performance packages, formulated to enhance viscosity at low temperatures without compromising traction coefficient.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traction fluid is formulated for high shear strength to provide torque transmission, then torque transmission capability is improved, but low temperature fluidity deteriorates
Solution Approach 1:
The patent modifies the chemical structure parameters of the base oil by introducing specific cyclic hydrocarbon structures with defined ring sizes and saturation levels. This changes the molecular parameters to achieve both high shear strength and improved low-temperature fluidity simultaneously, resolving the contradiction between torque transmission capability and low temperature flow characteristics.
Solution Approach 2:
The patent creates a composite traction fluid formulation by combining specific base oils with cyclic hydrocarbons and functional additives. This composite approach allows the fluid to exhibit both high shear strength from the cyclic hydrocarbon components and improved low-temperature fluidity from the optimized base oil blend, thereby resolving the performance contradiction.
2Strength
If traction fluid is formulated for high traction coefficient, then torque transmission is improved, but viscosity at low temperature deteriorates
Solution Approach 1:
The patent optimizes the molecular structure parameters by selecting cyclic hydrocarbons with specific ring sizes (5-8 membered rings) and saturation levels. This structural parameter optimization enables the fluid to maintain high traction coefficient while achieving acceptable viscosity at low temperatures, resolving the contradiction between traction performance and cold-temperature flowability.
Solution Approach 2:
The patent applies local quality modification by introducing specific functional groups and cyclic structures at particular positions within the molecular structure. This localized structural modification allows different regions of the fluid molecules to contribute differently: some regions provide traction while others maintain low-temperature fluidity, resolving the performance contradiction.
Data Source
Figure 1A~1B
AI summary
Traction fluids comprising Formula I, II, III, IV, V, VI, VII or a mixture thereof in combination with a base stock, a viscosity modifier, an anti-foaming agent, and an additive package.