All-purpose lubricating oil composition with anti-chatter characteristics for wet disc brakes

• US 3,899,432 A
• Filed: 06/03/1974
• Issued: 08/12/1975
• Est. Priority Date: 06/03/1974
• Status: Expired due to Term

• Current Assignee: Donald D. Dexter, Kenneth Rothert, Lester M. Hartmann
• Original Assignee: Donald D. Dexter, Kenneth Rothert, Lester M. Hartmann
• Inventors: Rothert, Kenneth, Dexter, Donald D., Hartmann, Lester M.
• Primary Examiner(s): Gantz, Delbert E.
• Assistant Examiner(s): Vaughn, I.
• Application Number:
  US05/475,687
• Time in Patent Office: 435 Days
• Field of Search: 252/32.7E,33,33.4,75
• US Class Current: 508/330
• CPC Class Codes: C10M 135/02 Sulfurised compounds
• CPC Class Codes: C10M 135/04 Hydrocarbons
• CPC Class Codes: C10M 135/06 Esters, e.g. fats
• CPC Class Codes: C10M 135/10 Sulfonic acids or derivatives thereof
• CPC Class Codes: C10M 137/04 Phosphate esters
• CPC Class Codes: C10M 137/10 Thio derivatives
• CPC Class Codes: C10M 159/24 containing sulfonic radicals
• CPC Class Codes: C10M 163/00 Lubricating compositions characterised by the additive being a mixture of a compound of unknown or incompletely defined constitution and a non-macromolecular compound, each of these compounds being essential
• CPC Class Codes: C10M 2205/00 Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
• CPC Class Codes: C10M 2205/026 Butene
• CPC Class Codes: C10M 2217/023 the amino group containing an ester bond
• CPC Class Codes: C10M 2217/028 containing monomers having an unsaturated radical bound to a nitrogen-containing hetero ring
• CPC Class Codes: C10M 2217/06 Macromolecular compounds obtained by functionalisation op polymers with a nitrogen containing compound
• CPC Class Codes: C10M 2219/02 Sulfur-containing compounds obtained by sulfurisation with sulfur or sulfur-containing compounds
• CPC Class Codes: C10M 2219/022 of hydrocarbons, e.g. olefines polyolefins C10M2221/041
• CPC Class Codes: C10M 2219/024 of esters, e.g. fats
• CPC Class Codes: C10M 2219/044 Sulfonic acids, Derivatives thereof, e.g. neutral salts
• CPC Class Codes: C10M 2219/046 Overbasedsulfonic acid salts
• CPC Class Codes: C10M 2223/04 Phosphate esters
• CPC Class Codes: C10M 2223/041 Triaryl phosphates
• CPC Class Codes: C10M 2223/045 : Metal containing thio derivatives
• CPC Class Codes: C10N 2010/04 : Groups 2 or 12
• CPC Class Codes: C10N 2040/02 : Bearings
• CPC Class Codes: C10N 2040/08 : Hydraulic fluids, e.g. brake-fluids

Abstract

Lubricating oil compositions are provided which comprise (A) a major amount of oil of lubricating viscosity, and (B) an effective amount of each of: (1) an oil-soluble substantially neutral Group II metal salt of a hydrocarbyl sulfonic acid; (2) an oil-soluble overbased Group II metal salt of a hydrocarbyl sulfonic acid; (3) an oil-soluble Group II metal salt of a dihydrocarbyl dithiophosphoric acid; (4) tricresyl phosphate; and (5) a sulfurized mixture of C10 25 olefins and fatty acid esters of C10 25 fatty acids and C1 25 alkyl or alkenyl alcohols, in an olefin-to-ester mol ratio of about 1-2:1 wherein the fatty acid and/or alcohol is unsaturated. These lubricating oil compositions are useful as functional fluids in a variety of systems. They are particularly useful in the hydraulic and gear box systems of large industrial and farm tractors providing excellent lubrication, increased braking capacity and reduced chatter of wet-type disc brakes.

Claims

1. A LUBRICATING OIL COMPOSITION COMPRISING:

A. A MAJOR AMOUNT OF AN OIL OF LUBRICATING VISCOSITY, AND B. AN EFFECTIVE AMOUNT OF EACH OF;

2. an oil-soluble overbased Group II metal salt of a hydrocarbyl sulfonic acid;

3. AN OIL-SOLUBLE GROUP II METAL SALT OF A DIHYDROCARBYL DITHIOPHOSPHORIC ACID,

4. TRICRESYL PHOSPHATE, AND

5. A lubricating oil composition of claim 4 wherein:

a. said neutral Group II metal salt of a hydrocarbyl sulfonic acid is present in from 1 to 6 weight percent of said composition;

b. said overbased Group II metal salt of a hydrocarbyl sulfonic acid is present in from 1 to 6 weight percent of said composition;

c. said Group II metal salt of a dihydrocarbyl dithiophosphoric acid is present in from 1 to 4.5 weight percent of said composition;

d. said tricresyl phosphate is present in from 0.5 to 1.5 weight percent of said composition; and

6. A lubricating oil composition of claim 4 wherein:

a. said neutral Group II metal salt of a hydrocarbyl sulfonic acid is present in from 1.4 to 4 weight percent of said composition;

b. said overbased Group II metal salt of a hydrocarbyl sulfonic acid is present in from 1.4 to 4 weight percent of said composition;

c. said Group II metal salt of a dihydrocarbyl dithiophosphoric acid is present in from 1.2 to 2.25 weight percent of said composition;

d. said tricresyl phosphate is present in from 0.75 to 1.25 weight percent of said composition; and

e. said sulfurized mixture of said olefins and said fatty acid esters is present in from 0.75 to 1.25 weight percent of said composition.