Shock Absorber Hydraulic Fluid With GTL Oil for High-Heat Stability

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Solution Overview

Problem

Existing hydraulic fluids in shock absorbers face issues with high friction and heat generation, leading to reduced ride quality and potential premature failure due to increased temperatures, especially when conventional base oils derived from crude oils are used.

Innovation Solution

Incorporating a secondary gas-to-liquid (GTL) oil ranging from 4.0 wt % to 10.0 wt % along with a balanced additive package in the hydraulic fluid, including antioxidants, anti-wear additives, and other components, to enhance the flash and fire points, resulting in improved thermal stability and reduced friction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional base oils derived from crude oils are used in hydraulic fluid, then the shock absorber can operate with basic lubrication properties, but the friction increases and heat generation occurs leading to reduced ride quality and potential premature failure

Engineering Contradiction:

Improveshock absorber lifespanVSAvoidfriction and heat generation

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent changes the chemical composition parameters of the hydraulic fluid by incorporating gas-to-liquid (GTL) derived base oil and specific additive packages. This chemical parameter change reduces friction and heat generation while improving thermal stability, directly addressing the harmful effects of conventional crude oil-based hydraulic fluids.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite hydraulic fluid formulation by combining GTL-derived base oil with a balanced additive package containing antioxidants, anti-wear additives, and other components. This composite material approach synergistically reduces friction and heat while enhancing overall fluid stability and performance.

Inventive Principle:

Principle #40Composite materials

2Temperature

If conventional hydraulic fluids are used, then the shock absorber can function at basic performance levels, but the flash point is insufficient leading to performance degradation at higher temperatures

Engineering Contradiction:

Improveoperating temperature rangeVSAvoidperformance stability

Core Design Contradiction:

TemperatureVSReliability

Solution Approach 1:

The patent significantly increases the flash point parameter of the hydraulic fluid from conventional levels to at least 174°C through the use of GTL-derived base oil. This parameter change enables the shock absorber to operate reliably in higher temperature ranges without performance degradation or safety issues.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12509640B2Shock absorber including a hydraulic fluid having an improved flash point

Publication Date: 2025.12.30 FEDERAL MOGUL MOTORPARTS LLC

AI summary

A shock absorber that includes a pressure tube that defines a working chamber having a hydraulic fluid located therein; a piston assembly positioned in the working chamber, and dividing the working chamber into an upper working chamber and a lower working chamber; and a piston rod engaged with the piston assembly that moves the piston assembly in the working chamber, wherein the hydraulic fluid includes a primary oil, a secondary oil, and an additive package, the secondary oil includes at least a gas-to-liquid oil in an amount that ranges between 4.0 wt % to 10.0 wt % relative to a total amount of the hydraulic fluid, and the hydraulic fluid includes a flash point of at least 174 degrees C.