RU2737889C1 - Friction coupling fluid - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates to compositions which are used as working fluid required for correct operation of friction plates of torque transmission clutch. Fluid for friction couplings contains oil of group IV or mixture consisting of oil of group IV and oil of group V, diphenylamine as antioxidant additive, dispersant, which is succinimide additive C-5A or borated succinimide dispersant, anti-foaming additive PMS-200, copper salts with organic acids as extreme pressure and antiwear additives. At that kinematic viscosity of liquid at 100°C is 6.0 cSt, kinematic viscosity at 40°C is 30.0 cSt.

EFFECT: technical result consists in the fact that the copper film formed on the friction surface of the steel discs protects them from hydrogen wear and increases the area of actual contact in the friction engagement thereby increasing the torque transmitted by the coupling.

1 cl, 1 tbl, 4 ex

Description

The invention relates to compositions that are used as a working fluid necessary for the correct operation of the friction discs of the torque transmission clutch.

From the "prior art" known a composition for lubricating a hydraulic clutch containing polydimethylsiloxane diphenylamine as an antioxidant in an amount of 1.0 wt. % and a base oil containing 0.1 wt. % dithiocarbamate as an antiwear agent, silicon oxide powder and silicon oxide (patent JPH 07197070 A, IPC C10M 169/04, publ. 1995-08-01).

In addition, a known clutch composition includes a base oil and a viscosity index improving agent. The oil contains poly-α-olefin having a kinematic viscosity of 1.0-3.0 mm ² / s at 100 ° C as the main component of the oil. The base oil has a viscosity of 1.0-2.5 mm ² / s at 100 ° C, the viscosity index improving agent is a polymethacrylate having an average molecular weight of 10000-1000. The oil composition contains 10-20 wt. % agent for improving the viscosity index and has a kinematic viscosity of 4.5-6.0 mm ² / s at 100 ° C and a viscosity index of 200-280.

The technical problem is that the use of the known compositions does not protect the steel discs of the friction clutch from hydrogen wear.

The object of the present invention is to eliminate the above disadvantages.

The technical result consists in the fact that the copper film formed on the friction surface of the steel discs protects them from hydrogen wear and increases the area of actual contact in the frictional engagement, thereby increasing the torque transmitted by the clutch.

The technical result is provided by the fact that the fluid for friction clutches contains a group IV oil or a mixture consisting of a group IV oil and a group V oil, diphenylamine as an antioxidant additive, a dispersant, antifoam additive PMS-200, copper salts with organic acids as an extreme pressure and antiwear additives. In this case, the kinematic viscosity of the liquid at 100 ° C is 6.0 cSt, the kinematic viscosity at 40 ° C is 30.0. The components are contained in the following ratios, wt. %:

diphenylamine 0.05 dispersant 0.1 antifoam additive PMS-200 0.003 copper salts with organic acids 0.3-0.5 group IV oil or a mixture of Group IV oil and Group V oil up to 100%

In accordance with particular cases of implementation, the invention has the following features.

As a dispersant, one of the following substances is used: succinimide additive C-5A, succinimide dispersant, borated succinimide dispersant, polyisobutylene succinimide with the number average molecular weight of the polyisobutylene substituent from 350 to 50,000, or up to 5000, or up to 3000.

The salts of copper with organic acids are salts of fatty monocarboxylic acids C ₁₂ -C ₂₂ with copper, at least one of the following: copper oleate, copper stearate.

Base oil

The base oil used in the compositions disclosed herein can be a Group IV oil or a mixture of a Group IV oil and a Group V oil. The base oil groups are as follows:

Table

Base oil category Sulfur (%) Saturated hydrocarbons (%) Viscosity index I group > 0.03 and / or <90 from 80 to 120 II group ≤0.03 and ≥90 from 80 to 120 III group ≤0.03 and ≥90 ≥120 IV group All polyalphaolefins (PAO) V group All others not included in I, II, III or IV group

Group IV base oils contain true synthetic chemical compounds obtained by polymerization of olefinically unsaturated hydrocarbons. Many Group V base oils are also truly synthetic and may include diesters, polyhydric alcohol esters, polyalkylene glycols, alkylated aromatics, phosphate esters, polyvinyl ethers and / or polyphenyl ethers, and the like, but can also be natural oils such as vegetable oils.

Antioxidant additive

Diphenylamine as an antioxidant additive extends the life of the composition by increasing the oxidation resistance.

Dispersant

The disperser is designed for mixing and even distribution of difficult-to-mix components. As a dispersant, one of the following substances is used: succinimide additive C-5A, succinimide dispersant, borated succinimide dispersant, polyisobutylene succinimide with the number average molecular weight of the polyisobutylene substituent from 350 to 50,000, or up to 5000, or up to 3000.

Antifoam additive

Antifoam additive PMS-200 reduces the tendency of the liquid to foam.

Antiwear and extreme pressure additives

The claimed composition contains an agent that reduces wear of rubbing surfaces and / or the formation of scuffing under load conditions and is copper salts with organic acids. The salts of copper with organic acids are salts of fatty monocarboxylic acids C ₁₂ -C ₂₂ with copper, at least one of the following: copper oleate, copper stearate.

Composition preparation technology includes the following stages:

- obtaining the composition by mixing the components included in the basic composition at a temperature of 60-70 ° C for 30 minutes;

- filtration of the resulting composition.

The prepared samples were evaluated for viscosity-temperature properties in accordance with GOST 33-2000 and GOST 25371-97, tribological properties on a four-ball friction machine in accordance with GOST 9490-75, thermal oxidative stability (TOC) of the lubricant composition in accordance with GOST 23797-79, and also measured ash content in accordance with GOST 1461-75, pour point according to GOST 20287-91, flash point according to GOST 4333-2014.

The resulting composition has the following properties:

Flash point over 200 ° C

Pour point about minus 60 ° С;

Kinematic viscosity about 6.0 at 100 ° C;

Kinematic viscosity about 30.0 at 40 ° C;

Pale to bright green in color;

Density - no more than 8.850 g / cm3.

The composition provides the ability to form a servovite film on the friction surface, which can withstand high loads, has a low coefficient of friction and protects against hydrogen wear.

The examples show particular cases of compositions.

Example 1

The fluid for friction clutches contains group IV oil, diphenylamine as an antioxidant additive, succinimide additive C-5A as a dispersant, antifoam additive PMS-200, copper oleate and copper stearate as extreme pressure and antiwear additives in equal proportions (50:50), the components are contained in the following ratios, wt. %:

diphenylamine 0.05 succinimide additive С-5А 0.1 antifoam additive PMS-200 0.003 copper salts with organic acids 0.5 group IV oil up to 100%

Example 2

Fluid for friction clutches contains a mixture consisting of Group IV oil and Group V oil, the ratio of oils in the mixture may be different, but the kinematic viscosity at 100 ° C should be 6.0, and the kinematic viscosity at 40 ° C should be 30.0 ... In addition, the liquid contains diphenylamine as an antioxidant additive, borated succinimide dispersant, antifoam additive PMS-200, copper oleate as an extreme pressure and antiwear additive, while the components are contained in the following ratios, wt. %:

diphenylamine 0.05 borated succinimide dispersant 0.1 antifoam additive PMS-200 0.003 copper oleate 0,4 a mixture of Group IV oil and Group V oil up to 100%

Example 3

Fluid for friction clutches contains a mixture of Group IV oil and Group V oil, the ratio of oils in the mixture may be different, but the kinematic viscosity at 100 ° C should be 6.0, and the kinematic viscosity at 40 ° C should be 30.0 ... In addition, the liquid contains diphenylamine as an antioxidant additive, succinimide additive C-5A as a dispersant, antifoam additive PMS-200, copper oleate as an extreme pressure and antiwear additive, while the components are contained in the following ratios, wt. %:

diphenylamine 0.05 succinimide additive С-5А 0.1 antifoam additive PMS-200 0.003 copper oleate 0.5 a mixture of Group IV oil and Group V oil up to 100%

Example 4

The fluid for friction clutches contains a group IV oil, diphenylamine as an antioxidant additive, a succinimide additive C-5A as a dispersant, antifoam additive PMS-200, copper oleate, and the components are contained in the following ratios, wt. %:

diphenylamine 0.05 succinimide additive С-5А 0.1 antifoam additive PMS-200 0.003 copper oleate 0.5 group IV oil up to 100%

The above-described compositions are used as a fluid for a friction clutch of a plug-in all-wheel drive, the principle of operation of which is based on the transmission of torque by means of a hydraulically compressible clutch pack.

Claims (3)

1. A fluid for friction clutches containing a group IV oil or a mixture consisting of a group IV oil and a group V oil, diphenylamine as an antioxidant additive, a dispersant, antifoam additive PMS-200, copper salts with organic acids as an extreme pressure and antiwear additives, while as a dispersant, the fluid for friction clutches contains a succinimide additive C-5A or a borated succinimide dispersant, and the kinematic viscosity of the fluid at 100 ° C is 6.0 cSt, the kinematic viscosity at 40 ° C is 30.0 cSt and the components are contained in the following ratios, wt%: diphenylamine 0.05 dispersant 0.1 antifoam additive PMS-200 0.003 copper salts with organic acids 0.3-0.5 group IV oil or a mixture of Group IV oil and Group V oil up to 100% 2. A liquid according to claim 1, characterized in that the salts of fatty monocarboxylic acids C ₁₂ -C ₂₂ with copper, at least one of the following: copper oleate, copper stearate, are used as copper salts with organic acids.