KR100262884B1 - Operating oil of power type direction regulator for automobile - Google Patents

Abstract

PURPOSE: Lubricating oil of a power steering device is provided to reduce noises occurring in sliding parts of a power steering by using actuating oil of low frictional coefficient. CONSTITUTION: A hydrogenation decomposition process comprises an atmospheric pressure sediment oil distillation process, a decompression gas oil hydrogenation process, a decompression gas oil hydrogenation decomposition reactive process and fractional distillation process. Unconverted oil is recycled from the fractional distillation process to the decompression distillation process of atmospheric pressure sediment oil in a fuel oil hydrogenation decomposition process of recycle mode. Herein, a part or all of unconverted oil is sent to the unconverted oil decompression distillation process to be manufactured and containing a viscosity of 3¯8 centistoke at 100deg.C and high level lubricating oil of over 100 of viscosity. Rest of unconverted oil is recycled only to the decompression gas oil hydrogenation process.

Description

Hydraulic fluid for motorized steering

The present invention relates to hydraulic fluid used in motorized steering apparatus for automobiles, and more particularly, to hydraulic oil of a motorized steering apparatus including high-grade lubricant base oil produced by a specific production process. The hydraulic fluid of the power steering apparatus of the present invention has a low coefficient of friction, thereby reducing noise that may occur in various sliding parts in the steering apparatus.

The motorized steering system has been expanded for the driving performance and convenience of the vehicle. More than 95% of passenger cars are equipped with the power steering system, and the functions are further complicated, and the speed-sensitive steering system and the speed-sensitive steering system are also complicated. Various types of power steering devices, such as devices, have been developed and used. Such a power steering system generates pressure by a hydraulic pump such as a vane pump or a gear pump to steer using this pressure. The lubricant used is between a hydraulic generation and a piston and a cylinder, and a gear and a gear of a gear pump. Or it is in charge of the lubrication between the vane and the vane of the vane pump, so the characteristics such as proper viscosity characteristics, excellent low temperature fluidity, abrasion resistance, friction characteristics, thermal oxidation stability, seizure resistance, compatibility with rubber materials and antifoaming properties are usually required. have.

However, the conventional power steering hydraulic fluid has a problem that the coefficient of friction in the pump sliding part or the valve is high, and such friction characteristics cause noise from the sliding part to reduce the quietness of the power steering device.

In order to solve the above problems, Japanese Patent Laid-Open Publication No. 5-331477 uses at least one type of zinc thiophosphate, phosphite ester and phosphate ester and improves these problems by using glycerin fatty acid ester. In 125383, a weight average molecular weight of 100,000 or more olefin copolymers or polyisobutylenes was applied to alleviate this problem. On the other hand, by using an excessive friction reducing additive to realize a low friction coefficient, there is also a problem that the additives settle down due to poor stability, Japanese Patent Laid-Open No. 2-265998 is to improve this problem by applying a base oil having excellent solubility It was. However, the above methods do not consider the friction characteristics of the base oil itself by using a friction reducing additive to realize a low friction coefficient and using a high solubility base oil to increase the solubility of these additives.

Accordingly, the present inventors pay attention to the friction characteristics of the base oil itself, and know that the base oil produced by a specific production process is superior to the base oil produced by a common commercial process in realizing low friction characteristics, and this is a power steering device Applied to the hydraulic fluid, the present invention has been completed, which is a hydraulic fluid having a low coefficient of friction.

An object of the present invention is to provide a hydraulic oil of a power steering device with a low friction coefficient in order to reduce noise that may occur in various sliding parts in the power steering device.

In order to achieve the above object, the operating oil of the power steering apparatus of the present invention is undiluted in the hydrocracking process consisting of atmospheric residue oil pressure distillation process, vacuum gas oil hydroprocessing reaction process, vacuum gas oil hydrocracking reaction process and fractional distillation process. In a fuel oil hydrocracking process of a recycled mode consisting of recycling oil (UCO) from a fractional distillation process to a vacuum residue distillation process, a part or all of the unconverted oil is sent to a separate unconverted oil vacuum distillation process. It includes a high lubricating base oil having a viscosity of 3 to 8 centistokes at 100 ° C. and a viscosity index of 100 or more. Here, the remainder of the unconverted oil is recycled only to the vacuum gas hydrocracking process.

In the unconverted oil vacuum distillation process, the unconverted oil having the above viscosity grade in the unconverted oil is subjected to a hydrodeswaxing and stabilization process, and the remaining unconverted oil is recycled to a reduced pressure gas oil hydrocracking reaction process. In addition, the unconverted oil vacuum distillation process is operated at a temperature of 300 to 350 ° C. and a bottom pressure of 50 to 300 mmHg.

In addition, the higher lubricating base oil is composed of 55 to 75% by weight naphthene component, 40 to 25% by weight paraffin component and 0 to 5% by weight aromatic component.

When used as the hydraulic oil of the power steering device using the high-grade lubricant base oil, the amount used is 100% by weight based on the weight percent, that is, the high-grade lubricant base oil can be used as the operating oil alone, and also the other high-grade lubricant base oil For example, the base oil may be mixed with a general mineral oil base oil such as solvent extraction mineral oil base oil, hydrogenation reforming mineral oil base oil or synthetic base oils such as polyalphaolefin, polyol ester or dibasic ester may be used as a working oil. When the higher lubricating base oil is mixed with other base oils, the higher lubricating base oil is used in an amount of 10% by weight or more, preferably 50 to 80% by weight. When the higher lubricating base oil is 10% by weight or less, the advantages of the high lubricating base oil are hardly exhibited.

Hereinafter, the present invention will be described in more detail with reference to Examples. However, the following examples are only illustrative of the present invention and the present invention should not be considered as being limited by the following examples.

<Example 1> Preparation of high grade base oil

The unconverted oil (UCO) discharged from the bottom of the distillation column in the fractionation distillation column is subjected to the atmospheric pressure in the hydrocracking process including the vacuum residue distillation process under reduced pressure, hydrogas treatment under reduced pressure gasification, hydrocracking under reduced pressure gas fractionation and fractionation distillation. The residue was recycled in a vacuum distillation process. At this time, a part or all of the unconverted oil is sent to a separate unconverted oil depressurization distillation process operated at a bottom temperature of 300 to 350 ° C. and a bottom pressure of 50 to 300 mmHg, and distilled, and discharged from the unconverted oil depressurization distillation process. The unconverted oil having the following viscosity grade in the unconverted oil was subjected to a hydrodewaxing and stabilization process to prepare a high grade lubricant base oil having a viscosity of 3 to 8 centistokes at 100 ° C. and a viscosity index of 100 or more. The remaining unconverted oil was recycled to a vacuum gas oil hydrocracking process.

Thus, an advanced lubricant base oil as shown in Table 1 below was obtained.

Properties of Advanced Lubricant Base Oils Prepared with Unconverted Oil Base oil 3 Base oil 4 Base oil 6 Viscosity @ 40 ℃ Viscosity @ 100 ℃ 12.083.01 18.554.01 34.326.05 Viscosity index 103 114 123 Aniline point, ℃ 104 112 121 Pour point, ℃ -27 -18 -12 Aromatic component, wt% 0.2 1.5 0.3 Naphthenic component, wt% 62.4 63.7 71.0 Paraffin component, wt% 37.4 36.1 28.7

<Experimental Example> Power Steering System Operating Oil Containing High Grade Lubricant Oil

Friction characteristics were evaluated by comparing the power steering hydraulic fluid including the high quality lubricant base oils 3 or 4 prepared in Example 1 with the power steering hydraulic fluid containing other base oils through the following test method. It is shown in Table 3 below.

Tester Name: SRV Tester

Friction material: steel disk and block made of polytetrafluoroethylene

Test condition: true width-1.0 mm

Frequency-50 Hz

Load-40 N

The base oil of the other species used in the comparative example of the following Table 3 is as Table 2 below.

Properties of Other Oils Used in Comparative Examples Solvent extraction Hydrogenation reforming Polyalphaolefin Viscosity @ 40 ℃ Viscosity @ 100 ℃ 20.134.09 20.174.14 17.103.91 Viscosity index 102 106 127 Aniline point, ℃ 101 109 125 Pour point, ℃ -15 -15 -54 Aromatic component, wt% 29.7 4.5 0.0

Performance of Motorized Steering System Hydraulic Oil Containing Advanced Lubricant Oil of the Invention Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Advanced Lubricant Oil 4 87.0 - - - - Advanced Lubricants 3 - 52.2 - - - Solvent Extraction Oil - 34.8 87.0 - - Hydrogenated Medium Oil - - - 87.0 - Polyalphaolefin - - - - 87.0 Additive concentrate 6.0 6.0 6.0 6.0 6.0 Viscosity Index Improver 7.0 7.0 7.0 7.0 7.0 Viscosity @ 40 ℃ 37.37 35.65 46.44 43.37 38.48 Viscosity @ 100 ℃ 7.83 7.67 8.74 8.58 7.52 Viscosity index 187 192 170 180 203 Aniline point, ℃ 109 105 97 100 114 Pour point, ℃ 〈-50 〈-50 -47.5 -47.5 〈-50 Cold Brookfield Viscosity @ -40 ℃, cP 13,500 15,500 37,400 33,100 4,600 Rubber deposition test (120 ℃, 72 hr) Pass Pass Pass Pass Fail SVR Friction Test 0.054 0.057 0.065 0.062 0.052

Looking at Example 2 and Comparative Examples 1,2 and 3, it can be seen from Table 3 that Example 1 and Comparative Example 3 exhibited excellent performance in low temperature viscosity characteristics and SRV friction test. However, in Comparative Example 3, there was a problem in performance in the rubber deposition test. Since the power steering system uses rubber of various materials and types for sealing, compatibility with rubber materials is one of the important performance items.

Comparing Example 3 and Comparative Example 1, it was shown that Example 3 to which some of the high-grade lubricant base oil using unconverted oil has better low temperature characteristics and friction characteristics than Comparative Example 1 using only solvent extraction base oil.

As described above, the power steering system hydraulic fluid containing the high-grade lubricating base oil of the present invention has a low coefficient of friction, which can effectively reduce the noise that may occur in various sliding parts in the steering system as compared with the case of using other types of base oils. have. Therefore, when the power steering apparatus hydraulic flow composition of the present invention is used in the power steering apparatus, it is possible to realize a power steering apparatus with low noise, that is, maintaining quietness.

Claims (6)

In the hydrocracking process consisting of an atmospheric residue oil distillation under reduced pressure distillation, a vacuum gas oil hydrotreating process, a vacuum gas oil hydrocracking process, and a fractional distillation process, unconverted oil (UCO) is removed from the fractional distillation process. In the fuel oil hydrocracking process of the recycle mode for recycling in a recycle mode, a part or all of the unconverted oil is separated and sent to a separate unconverted oil vacuum distillation process, and has a viscosity of 3 to 8 centistokes at 100 ° C., and a viscosity index. Hydraulic oil of the power steering system containing a high grade lubricant base oil of 100 or more. The method of claim 1, wherein the non-converted oil decompression process is operated at a temperature of 300 to 350 ℃ on the basis of the bottom temperature and a pressure of 50 to 300mmHg on the basis of the bottom pressure, Working oil. 2. The hydraulic oil of a powered steering apparatus according to claim 1, wherein the unconverted oil depressurization process includes a hydrodeswaxing and stabilization process. 2. Powered steering according to claim 1, characterized in that the higher lubricating base oil comprises 55 to 75% by weight naphthenic component, 40 to 25% by weight paraffin component and 0 to 5% by weight aromatic component. Working oil of the device. 5. The motorized steering apparatus according to claim 1 or 4, comprising high grade lubricating base oil and other kinds of base oils calculated by the unconverted oil depressurization distillation process, wherein the high grade lubricating base oil comprises at least 10% by weight. Working oil. 6. The hydraulic oil of a powered steering device according to claim 5, wherein the high quality lubricant base oil is 50 to 80% by weight.