Lubricating Oil Composition for CVT Clutch Anti-Shudder
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Solution Overview
Problem
Current lubricating oil compositions for torque converters in continuously variable transmissions fail to achieve a high intermetallic friction coefficient and long-term clutch anti-shudder performance, leading to increased energy loss and vibration issues.
Innovation Solution
A lubricating oil composition comprising an amide compound with specific hydrocarbon groups, a metal-based detergent, and a phosphorus acid ester, which enhances the intermetallic friction coefficient and clutch anti-shudder performance by optimizing the content and structure of these components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional lubricating oil compositions are used in torque converters, then the basic lubrication function is provided, but the intermetallic friction coefficient is insufficient and clutch anti-shudder performance is poor
Solution Approach 1:
The patent employs a composite additive package comprising four specific components: (A) amine compound with 6-10 carbon atoms, (B) phosphorus-containing compound (phosphoric monoester/diester/phosphorous monoester), (C) metal sulfonate or phenate, and (D) another metal sulfonate or phenate. This composite formulation synergistically combines different chemical mechanisms to achieve both high intermetallic friction coefficient and excellent clutch anti-shudder performance, resolving the contradiction between performance requirements and formulation complexity.
Solution Approach 2:
The patent specifies precise parameter ranges for each component: amine compound (6-10 carbon atoms), phosphorus-containing compound (specific esters), metal sulfonate/phenate ratios, and concentration percentages in the lubricating oil. By optimizing these parameters within defined ranges, the formulation achieves the dual performance target of high friction coefficient and superior anti-shudder characteristics.
2Loss of energy
If the frictional properties of lubricating oil are not suitable for slip control, then energy loss is reduced, but self-excited vibration called shudder occurs
Solution Approach 1:
The lubricating oil composition acts as an intermediary substance that mediates between the clutch plates, providing controlled friction characteristics. The specific additive package creates a friction modification layer that enables slip control for energy loss reduction while preventing the harmful self-excited vibrations through its damping properties.
Solution Approach 2:
The patent modifies the friction parameters of the lubricating oil by incorporating specific additives that change the shear stress-slip velocity relationship. This parameter modification enables the oil to provide appropriate friction for slip control while suppressing the vibration-generating feedback loop that causes shudder.
3Power
If lubricating oil composition is optimized for high intermetallic friction coefficient, then power transmission capability is improved, but clutch anti-shudder lifetime is reduced
Solution Approach 1:
The patent uses a composite additive system where each component contributes specific functions: the amine compound provides friction modification, the phosphorus-containing compound enhances anti-wear and friction stability, and the metal sulfonate/phenate compounds provide both friction enhancement and anti-shudder durability. This composite approach achieves both high power transmission capability and extended clutch anti-shudder lifetime.
Solution Approach 2:
The lubricating oil composition is designed to maintain stable friction and anti-shudder properties throughout the clutch's operational lifetime. The additive package ensures continuous effective action by preventing degradation of friction characteristics over time, thereby extending the clutch anti-shudder lifetime while maintaining power transmission capability.
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 composition achieves a high intermetallic friction coefficient and excellent clutch anti-shudder performance, ensuring both initial and long-term effectiveness, thereby reducing energy loss and vibration in torque converters.
Implementation Method 1
a lubricating oil composition having a high intermetallic friction coefficient
Implementation Method 2
the frictional properties of a lubricating oil are unsuitable, there may occur self-excited vibration called shudder
Implementation Method 3
there may occur self-excited vibration called shudder. Accordingly, a lubricating oil is required to have clutch anti-shudder performance
Data Source
AI summary
Provided are a lubricating oil composition having a high intermetallic friction coefficient and having excellent clutch anti-shudder performance of excellent initial clutch anti-shudder performance and a long clutch anti-shudder lifetime, and a lubrication method and a transmission using the lubricating oil composition. The lubricating oil composition contains an amide compound (A) having a specific structure, a metal-based detergent (B), and at least one phosphorus acid ester (C) selected from an acid phosphate ester and an acid phosphite ester; and the lubrication method and the transmission use the lubricating oil composition.