EPB Lubricant Composition for EPDM-Compatible High-Temperature Operation
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Solution Overview
Problem
Existing lubricants for electronic parking brakes (EPBs) face issues with compatibility with double synthetic rubber (EPDM) sealing materials, leading to chemical attack and reduced lubricity at high temperatures due to low kinematic viscosity.
Innovation Solution
A lubricant composition comprising 85-95% polyalkylene glycol base oil, 1-5% antioxidant (amine-based compound), and 1-5% each of amine salt of phosphate and nano-diamond dispersion as anti-wear extreme-pressure additives, with a kinematic viscosity of 30-40 cSt, enhancing compatibility and high-temperature operability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PAO-based grease is used for EPB lubrication, then anti-wear and extreme-pressure properties are improved, but compatibility with EPDM rubber deteriorates due to chemical attack
Solution Approach 1:
The patent changes the chemical composition parameters of the base oil from PAO to polyalkylene glycol (PEG), which fundamentally alters the chemical properties to be compatible with EPDM rubber while maintaining lubrication performance. This parameter change resolves the contradiction by selecting a base oil with different chemical characteristics that do not attack the rubber sealing material.
Solution Approach 2:
The patent creates a composite lubricant formulation combining polyalkylene glycol base oil with specific additives (amine-based antioxidant, phosphate ester anti-wear additive, and nano-diamond dispersion). This composite approach maintains the beneficial properties of PEG while adding functional components that provide anti-wear and extreme-pressure protection, resolving the contradiction between compatibility and protective performance.
2Temperature
If glycol-based brake fluid is used, then low-temperature and room temperature characteristics are improved, but high-temperature lubricity deteriorates due to low kinematic viscosity
Solution Approach 1:
The patent changes the viscosity parameter of the brake fluid by formulating it with polyalkylene glycol base oil having a kinematic viscosity of 30-40 cSt at 40°C. This parameter adjustment ensures the fluid maintains adequate viscosity and lubricity at high temperatures while still providing good low-temperature performance, resolving the contradiction between temperature range performance.
3Adaptability or versatility
If independent EPB parts with EPDM sealing are used, then compatibility with brake fluid is improved, but lubrication performance deteriorates due to PAO-based grease incompatibility
Solution Approach 1:
The patent changes the chemical composition from PAO to polyalkylene glycol, which is chemically compatible with EPDM rubber. This parameter change allows the lubricant to work with the EPDM sealing material without causing chemical attack, while the added anti-wear additives ensure adequate lubrication performance is maintained.
Solution Approach 2:
The patent develops a composite lubricant system using polyalkylene glycol base oil combined with phosphate ester anti-wear additives and nano-diamond dispersion. This composite formulation provides both compatibility with EPDM rubber and sufficient lubrication performance, resolving the contradiction between adaptability and reliability.
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 exhibits excellent anti-wear and extreme-pressure properties, maintaining lubricity and durability across various temperatures, suitable for EPBs.
Implementation Method 1
grease or lubricants are used to reduce noise caused by friction between automobile parts
Implementation Method 2
the lubricant composition may have a kinematic viscosity at 40 °C in a range of 30 cSt to 40 cSt
Implementation Method 3
1 wt% to 5 wt% of an antioxidant; wherein the antioxidant includes an amine-based compound
Implementation Method 4
1 wt% to 5 wt% of a first anti-wear extreme-pressure additive; and 1 wt% to 5 wt% of a second anti-wear extreme-pressure additive
Implementation Method 5
the second anti-wear extreme-pressure additive includes a nano-diamond dispersion; the nano-diamond dispersion may include nano-diamond particles having an average particle size of 3.0 nm to 10 nm
Data Source
AI summary
A lubricant composition with excellent high-temperature operability, the lubricant composition including: 85 wt% to 95 wt% of a polyalkylene glycol base oil; 1 wt% to 5 wt% of an antioxidant; 1 wt% to 5 wt% of a first anti-wear extreme-pressure additive; and 1 wt% to 5 wt% of a second anti-wear extreme-pressure additive, wherein the antioxidant includes an amine-based compound, the first anti-wear extreme-pressure additive includes an amine salt of phosphate, and the second anti-wear extreme-pressure additive includes a nano-diamond dispersion.