JPH0617075A - Lubricants, especially lubricating greases for constant velocity universal joints - Google Patents

Abstract

(57) [Abstract] [Purpose] A high performance lubricant that is particularly useful for smoothing and reducing or eliminating the unpleasant tremors of constant velocity universal joints operating under conditions of high torque and large angles of joints. provide. A lubricant composition comprising a base oil and an additive homogeneously mixed with the base oil, wherein the additive is at least one organic molybdenum selected from the group consisting of molybdenum dithiocarbamate and molybdenum dithiophosphate. The above lubricant composition comprising a compound and at least one ashless additive selected from the group consisting of ashless dithiophosphates and ashless dithiocarbamates.

Description

Detailed Description of the Invention

The present invention relates to lubricants, and more specifically,
It relates to lubricating greases which are particularly useful for smoothing and reducing or eliminating the unpleasant quiver of constant velocity universal joints operating under conditions of high articulation torques and large angles.

Although the present invention is primarily concerned with lubricating grease compositions, it also has utility in other lubricants such as lubricating oils.

Under the conditions of high torque and large angle of the joint, the constant velocity universal joint mounted on the vehicle body gives an unbalanced torque to both wheels during driving of the vehicle, resulting in an unpleasantly vibrating ride. The purpose of the present invention is to
Broadly speaking, there is the provision of a lubricant for such constant velocity universal joints which can reduce or eliminate such unpleasant vibrations. Such lubricants or greases may be used in other applications where high performance, low friction lubricants are needed.

Methods and apparatus for producing lubricants, especially lubricating greases, are well known. Similarly, lubricating greases contain oil as a basic component and a thickener for the oil, in which various low-friction additives are homogeneously compounded so as to obtain a homogeneous homogeneous mixture of all components. It is also well known that The invention is particularly directed to the combination of additives utilized (sometimes referred to as an "additive package"). The lubricating grease formulated according to the present invention has the following general formulation. That is, a general prescription base oil thickener molybdenum dithiocarbamate and / or molybdenum dithiophosphate An ashless dithiophosphate and / or an ashless dithiocarbamate.

Suitable base oils are those such as mineral oils or synthetic hydrocarbon oils having a lubricant viscosity. Various known thickeners can be used, and preferred are urea types (monourea, diurea, triurea, tetraurea, and polyurea).

Additives are commercially available from various sources under the following trade names: That is, molybdenum dialkyldithiocarbamate (MoDTC) and molybdenum dialkyldithiophosphate (MoDTP) are available from RTVanderbilt Company, Inc. of Norwalk, Conn. Under the trade names MOLYVAN A and MOLYVAN L, respectively. Molybdenum diaryldithiophosphates are available as SAKURA Lube 300 from Asahi Denka Co., Ltd. Ashless dithiophosphates and ashless dithiocarbamates from RTVanderbilt Company, Inc.
VANLUBE 7611 and VANLUB
Available under the trade name of E732.

[0007]

EXAMPLES The following are specific and preferred examples of lubricating greases showing aspects of the present invention.

Preferable Example (Grease A) Weight% 600 SUS * Solvent-refined Paraffin Oil 84.5% Polyurea Thickener 13.0% PolyVan L 1.0% Vanlube 7611 1.5% * 37.8 ° C. ( 600 Saybolt universal second viscosity at 100 ° F).

The grease of the above preferred example was prepared by the following conventional method.

The polyurea thickening agent was added to (a) 3 in a kettle.
About 30% by weight of solvent extracted neutral base oil having a viscosity of 600 SUS at 100 ° F. and (b) about 7.
Prepared by adding 45 wt% primary oleylamine. This primary amine base oil is then admixed with about 5.4 wt% isocyanate (eg, 143 L-MDI manufactured by Dow) at a maximum temperature of 48.9 ° C. (120 ° F.) for 30-60 minutes. Mixed. Then, add about 3% by weight of water and stir for about 20 to 30 minutes to obtain 40% by weight.
Base oil was added and heated to 160 ° C (320 ° F). The grease was then cooled to 82.2 ° C (180 ° F). At this point, then 1% PolyVanL and 1.5% Vanlube 7611 were added along with the balance of the base oil. Then, the obtained grease was subdivided by a colloid mill.

The grease of the above preferred example (Grease A)
Was subjected to the following standard physical tests and the results are shown in comparison with the following comparative examples.

(Grease B) Polyurea grease (Grease C) 3% Poly Lithium (Grease D) Lithium grease (Grease E) Lithium grease w / Low friction additive package (Grease F) Polyurea grease w / 3% Molybdenum disulfide Table 1 Grease 60X * 4 Ball friction ** Drop point (A) 312 0.33mm 412 ° F (B) 298 0.67mm 412 ° F (C) 292 0.68mm 401 ° F (D) 285 0 .72mm 408 ° F (E) 285 0.35mm 417 ° F (F) 330 0.64mm 423 ° F * 60 strokes in standard grease operated as described in ASTM Method D-217 ** ASTM Method D-2596-87.

The grease composition (Grease A) of the above-mentioned preferred example is used as an Optimol Lubricants (Optimo).
Lubricants, Inc. (New Jersey,
Carterlet) Optimol SRV tester is used to demonstrate the ability of the grease to minimize or eliminate vibrations in a constant velocity universal joint, in order to demonstrate line contact SRV (Line Contact).
SRV) -Friction load test. For comparison,
The grease compositions of B to F were also subjected to the same test. The results of the comparative test are shown in Table 2.

[0014] Other applications in which the present invention can be practiced include applications such as antifriction bearings (rolling bearings), reciprocating pivots, automotive steering linkages, automotive ball joints, and the like.

From the preferred examples described above, it is clear that different components can be used in different ranges. In general, a useful range for combined base oils, fillers and thickeners is from 80 to 99.9% by weight of the grease composition and a useful range for the additive package is from 0.1 to 20% by weight. is there.

Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI Technical display location C10M 115: 08 119: 24) C10N 10:12 30:02 30:06 40:04 50:10 (72) Invention Mark Baum, Northwest 80th Street, Kansas City, 64118 Missouri, USA 105

Claims (5)

[Claims] 1. A lubricant composition comprising a base oil and an additive homogeneously mixed with the base oil, wherein the additive is at least one selected from the group consisting of molybdenum dithiocarbamate and molybdenum dithiophosphate. The above lubricant composition comprising an organic molybdenum compound and at least one ashless additive selected from the group consisting of ashless dithiophosphates and ashless dithiocarbamates. 2. A lubricating grease comprising a base oil and a thickener for the base oil and additives in a homogeneous mixture therewith, the additive being from the group consisting of molybdenum dithiocarbamate and molybdenum dithiophosphate. Said lubricating grease comprising at least one organic molybdenum compound selected and at least one ashless additive selected from the group consisting of ashless dithiophosphates and ashless dithiocarbamates. 3. The lubricating grease according to claim 2, wherein the thickener is at least one monourea compound. 4. A lubricant composition comprising a base oil and an additive homogeneously mixed with the base oil, wherein the additive comprises (1)
At least one molybdenum compound selected from the group consisting of molybdenum dialkyldithiophosphate, molybdenum dialkyldithiocarbamate and molybdenum diaryldithiophosphate, and (2) selected from the group consisting of ashless dithiocarbamate and ashless dithiophosphate. The above lubricant composition comprising an ashless additive. 5. A base oil and a polyurea thickener for the base oil and approximately 1.0% by weight of a homogeneous mixture thereof.
Lubricating grease containing molybdenum dialkyldithiophosphate and approximately 1.5% by weight of ashless dithiophosphate.