Power Transmission Fluid Friction Durability via Ashless Dispersant
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Power transmission fluids experience a decrease in friction properties over time, leading to issues like shudder in slipping torque converter clutches, instability of dynamic friction in automatic transmissions, and belt rattle in continuously variable transmissions, which reduces their useful life.
Innovation Solution
Incorporating an oil-soluble aliphatic tertiary amine and an ashless dispersant into the power transmission fluid, which initially acts as a friction-neutral additive but transforms under operating conditions to maintain and enhance frictional performance, thereby compensating for the degradation of other components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional additives are used to provide friction properties, then initial friction performance is improved, but friction properties degrade over time
Solution Approach 1:
The patent applies preliminary action by incorporating an ashless dispersant that proactively transforms over time to compensate for friction degradation. The dispersant is initially present in a precursor form that gradually converts to active friction-modifying compounds during service, thereby preliminarily preparing the fluid to maintain friction properties throughout its lifecycle rather than degrading passively.
Solution Approach 2:
The patent employs parameter changes by utilizing the temporal transformation of the ashless dispersant's chemical properties. The dispersant's molecular structure and friction-modifying characteristics change over time under operating conditions, allowing the fluid to dynamically adjust its friction properties to compensate for degradation of other components, thus extending useful life.
2Reliability
If friction modifiers are added to improve initial performance, then friction control is enhanced, but performance stability over time deteriorates
Solution Approach 1:
The patent applies self-service by designing an ashless dispersant that automatically transforms and regenerates friction-modifying properties within the fluid system over time. The dispersant serves itself by converting from a precursor state to active compounds that maintain friction control, eliminating the need for external replenishment and ensuring long-term performance stability without degradation.
Solution Approach 2:
The patent implements feedback through the ashless dispersant's time-dependent transformation mechanism. As the fluid operates and other components degrade, the dispersant progressively transforms to increase friction modification, creating a self-regulating system that compensates for performance loss and maintains stable friction characteristics throughout the fluid's service life.
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 fluid maintains improved friction durability over time, reducing the static-to-dynamic friction ratio and extending the life of the fluid in power transmission devices, as demonstrated by empirical testing.
Implementation Method 1
an oil-soluble aliphatic tertiary amine and an ashless dispersant into the power transmission fluid, which initially acts as a friction-neutral additive but transforms under operating conditions
Implementation Method 2
an oil-soluble aliphatic tertiary amine and an ashless dispersant into the power transmission fluid
Implementation Method 3
Power transmission fluids formulated according to the present disclosure provide improved frictional durability
Data Source
AI summary
A power transmission fluid composition having improved characteristics. The fluid may include a base oil and an additive composition, wherein the additive composition includes an ashless dispersant and an oil-soluble aliphatic tertiary amine. The resulting fluid may have improved durability characteristics.