JPS5971395A - Versatile lubrication oil composition - Google Patents

Abstract

PURPOSE:To provide a versatile lubrication oil composition containing a specific tertiary amine as a friction regulator, and applicable not only to a power transmission such as engine, variable speed gearing, etc. and a hydraulic part such as power stearing device, but also to an oil-immersed disk brake. CONSTITUTION:The objective versatile lubrication oil composition contains usually 0.01-5.0wt% of one or more tertiary amines of formula (R1, R2 and R3 are 1-28C alkyl or alkenyl) (preferably dimethyl-stearylamine, dimethyloleylamine, dimethyl coconut amine, etc.) as a friction regulator. The base oil of the lubricant may be a mineral oil or synthetic oil preferably having a kinetic viscosity of about 4-20cst at 100 deg.C and a viscosity index of 50-150.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a common lubricating oil composition, and more specifically, it is suitable for use only in engine parts, power transmission parts such as transmissions or differentials, or hydraulic operating parts such as lifting and lowering operations of working machines or power steering. First, it relates to a common lubricating oil composition that can also be applied to oil-immersed disc brakes, so-called wet brakes.

Agricultural machinery or tanker trucks that cost less than 100 yen,
Construction machinery such as wheel loaders and forklifts are equipped with engines, transmissions, differentials, hydraulic systems, etc., and these equipments are difficult to manage in terms of lubricant management and lubricant availability in the general market. Therefore, there is a need for a so-called common lubricant that can be applied to all equipment, and is actually used.

For this reason, the common lubricating oil used here has the performance not only as an engine oil but also as a gear oil and a hydraulic oil.

In recent years, wet brakes have been used in vehicles such as trucks because they have the characteristics of providing more stable braking force than conventional dry brakes, superior heat dissipation through lubricating oil, and superior durability of friction materials. It is increasingly being used in agricultural machinery and construction machinery such as tankers, wheel loaders, forklifts, etc. Therefore, common lubricants used in agricultural machinery and construction machinery equipped with wet brakes. In addition to performance as an engine oil, gear oil, and hydraulic fluid, it must also have performance as a wet brake fluid.

However, wet brakes exhibit different friction characteristics depending on the combination of the wet friction material and lubricating oil used, and often generate brake squeal due to stick-slip during braking. The tone of this brake squeal varies depending on the rigidity of the machine used or the conditions of use, but all are unpleasant.

In order to prevent this brake squeal, it is considered possible to change the frictional characteristics of the lubricating oil and prevent brake squeal by adding an additive generally called a friction modifier.

However, depending on the type and amount of friction modifier added, even if brake squeal can be prevented, brake torque may be reduced and braking force, which is the original function of the brake, may not be obtained. However, it often has a negative effect on performance other than brakes, such as performance as engine oil, gear oil, and hydraulic fluid.

For example, as friction modifiers, higher fatty acids such as oleic acid and stearic acid, primary amine compounds such as oleic acid, stearylamine, etc., or secondary amine compounds [JP-A-54-1 '60402], oleic acid]/ Organic acid amides such as acid amides, sulfides of fats and oils such as sulfurized whale oil (SA
E Paper 740667), organic phosphorus compounds such as phosphate, phosphite, and aranodophosphate have been proposed as effective, but when used as engine oil, these all cause corrosion of bearing links and ring damage. This causes problems such as heavy loading, which significantly reduces engine performance. On the other hand, if only a small amount or no friction modifier is used, such as carbon oil or engine oil, brake squeal is observed, and the magnitude of the brake squeal is different for each type, so extreme pressure agents and cleaners Dispersants and the like often also promote brake squeal, depending on their type and amount.

Therefore, common lubricants used for agricultural machinery or construction machinery equipped with wet brakes should include appropriate extreme pressure agents,
It is an extremely important technique to select a detergent dispersant, an antioxidant, and to use a combination of a friction modifier. The reality is that a common lubricant with sufficient performance to meet these demands has not yet been developed.

The present inventors investigated the influence of lubricating oil components on the friction condition, the combination effect, etc., and as a result of intensive research, the inventors found that brake squeal can be reduced, which could not be achieved with the conventionally used aZ friction modifier. We have now developed a common lubricating oil composition that does not cause any problems and can be used for engines, gears, hydraulic pressure, etc. without causing any problems.

The common lubricating oil of the present invention is a composition characterized by adding a tertiary amine represented by Formula 1 as a friction modifier to a large amount of a lubricating base oil.

(In the formula, R1, R2, and R3 represent an alkyl group or an alkenyl group having 1 to 28 carbon atoms.) That is, the gist of the present invention is that one or two tertiary amines represented by formula 1 are used as a friction modifier. The present invention relates to a common lubricating oil composition characterized in that it has a richness of more than 100%.

The tertiary amine of formula 1 useful in the present invention contains an alkyl or alkenyl group having 1 to 28 carbon atoms, more preferably two methyl groups and an alkyl or alkenyl group having 4 to 28 carbon atoms. Specific examples of those containing one group include Cl8H35Z dimethylcoconutamine, all of which are commercially available.

The ones shown here can be used alone, but they can also be used in combination.

The lubricating base oil that makes up a large portion of the common lubricating oil of the present invention can be a conventional mineral oil-based or synthetic lubricating oil, preferably having a kinematic viscosity of about 4 to 20 cst at 100'OM,
More preferably, those in the range of 6 to 10 cst can be used. Further, the viscosity index can be appropriately selected depending on the specifications, but a value of 50 to 150 is usually suitable. In the common lubricating oil of the present invention, it is necessary to blend various additives in addition to the friction modifiers mentioned above.In other words, these additives include antioxidants, detergent dispersants, etc. additives, anti-wear agents, extreme pressure agents, etc. All of these additives are well known in the industry.

In the present invention, alkyl- or aryl-substituted zinc dithiophosphate can be used as the extreme pressure agent (or anti-wear agent) and non-oxidizing antioxidant. Further, as the detergent dispersant used in the present invention, either a metal type or an ashless type can be used, and it is of course possible to use a mixture of both.

Metallic cleaning and dispersing agents include metal salts called sulfonates, phenates, salicylates, and phosphatide, and alkaline earth metals such as barium, calcium, and machinenium are used as metals, and conventionally known methods are used. You can use those manufactured by.

On the other hand, examples of ashless detergents and dispersants include alkenylsuccinic acids and their derivatives, and benzylamine-based detergents.

The lubricating oil composition of the present invention; in which a friction modifier (or
01 to 5.0% by weight, preferably 0.1 to 30% by weight. If the amount added is too small, the desired effect will not be achieved, and if it is too large, problems will arise in solubility and oxidation stability will also deteriorate.

Further, the alkyl or aryl substituted zinc dithiophosphate added as an extreme pressure agent and antioxidant is 01 to 50% by weight, preferably 05 to 20% by weight, and the metal detergent and dispersant added as a detergent and dispersant is 1 to 50% by weight. .0 to 10.0% by weight, preferably 2.0 to 7.0% by weight, and 0.1 to 5.0% by weight, preferably 0.0% to 5.0% by weight of an ashless detergent and dispersant added if necessary. It is preferable to mix 5 to 30% by weight. If the amount of these additives added is too small, the desired effect cannot be expected, and on the contrary, too much brake squeal may occur.

In the common lubricating oil of the present invention, in addition to the above-mentioned additives, viscosity index improvers, pour point depressants, rust inhibitors, or antifoaming agents that are blended in ordinary lubricating oils can be used in combination. When these additives are mixed and blended, each additive may be within the range normally used, and the total amount may be 0.1
By using the lubricating oil of the present invention containing an additive of ~150% by weight, flake noise in wet brakes can be completely prevented, and it also exhibits excellent performance as an engine oil, gear oil, and hydraulic oil.

In addition, when using this composition as a special oil for wet brakes, it is of course possible to use this composition as is, but
Since no particular detergent/dispersion notes are required, it is of course possible to use a base oil without a metallic detergent/dispersant or an ashless detergent/dispersant.

The following will specifically explain examples and comparative examples, but the embodiments of the present invention are not limited to these examples.

EXAMPLES AND COMPARATIVE EXAMPLES According to the usual lubricating oil composition mixing method in the art, refined mineral oil (with a viscosity of 5AEIO grade) was used as the base oil.
If necessary, a refined mineral oil with a viscosity of grade 5AE20) and various additives are mixed in the proportions shown in Table 1 to form a lubricating viscosity 5 shown in Table 2 with a kinematic viscosity of JISK2283-1980 (
3), CC8 viscosity is J I SK2215-1980
Obtained according to (paragraph 4, 15).

Examples 1 to 3 are compositions according to the present invention, Comparative Example 1 is a composition in which no friction modifier is added, and Comparative Example 2 is a known common lubricating oil composition outside the scope of the present invention. The above Examples and Comparative Examples are examples of compositions using friction modifiers that are effective when added. The performance was evaluated in a non-test and a pump test, and the results shown in Table 3 were obtained.

Comparative example 3.4 shown in Table 3 uses enzone oil, car oil,
These are examples of commercially available common lubricating oils that are said to be effective in preventing wet brake squeal as well as their performance as hydraulic fluids, and their kinematic viscosity at 100°C is 10.7 c.
St, 10.6C8t, CC8 at -18°C
Viscosity is 1,900 cP and 1,850 cP, respectively.
It is.

The test methods listed in Table 3 are as follows: Compliant with IAE Gear Test IP-166/68.

Wet Brake Squeal Test A Mitsubishi Agricultural Machinery Tractor MT-2501 was driven at low speed, only one wheel was braked, and the presence or absence of brake squeal occurring at that time was checked.

Evaluation Criteria: The occurrence of brake squeal is rated as ×, and the absence of brake squeal is rated as ○.

4-cycle supercharged diesel engine test Caterpillar IG uses Caterpillar monotube engine
Compliant with 2 laws (200 hours operation).

Evaluation criteria: A piston cleanliness rating (WTD) of less than 300 is considered a pass, and a piston cleanliness score of 300 or more is considered a fail.

Pump test using Hira-Kase 104C vane pump, compliant with Hira-Kase method, (pressure 140 Kg/Cm2, oil temperature 90℃, 250
time driving).

Evaluation criteria: total wear amount of cam ring and vane or 250
If the amount is less than 250 mg, it is passed, and if it is more than 250 mg, it is not passed.

As is clear from the results in Table 3, Comparative Example 1゜3 exhibited wet brake noise, and Comparative Example 2゜4 did not exhibit wet brake noise, but the engine performance failed. However, it does not have sufficient performance as a common lubricant.

On the other hand, in Examples 1 to 3 according to the present invention, there is no wet brake noise at all, and the results of gear tests, engine tests, and pump tests show that they have sufficient performance as gear oil, engine oil, or hydraulic oil. It is clear that

Patent applicant: Mitsubishi Oil Corporation (1 other person)

Claims (5)

[Claims] (1) Contains one or more types of tertiary amines as a friction modifier (in the formula, R1, R2, and R3 each represent an alkyl group or an alkenyl group having 1 to 28 carbon atoms) A common lubricating oil having three characteristics, g? l. (2) In the tertiary amine ζ shown in formula 1, R1, t
2. The common lubricating oil according to claim 1, wherein two of R3 are methyl groups and the remaining one is an alkyl group or alkenyl group having 4 to 28 carbon atoms. Composition. (3) The common lubricating oil composition according to claim 1, containing 0.01 to 5.0 weight percent of tertiary amine. (4) It is characterized by containing 0.1 to 5.0 weight part of zinc dialkyl-1 or diaryldithiophosphate and 1.0 to 10.0 weight part of a basic or ultrabasic metal detergent dispersant. A common lubricating oil composition according to claim 3. (5) The common lubricating oil composition according to claim 4, which contains an ashless type detergent and dispersant having a weight coefficient of 0.1 to 50.