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Hydraulic oil for use in construction machinery

A technology of construction machinery and hydraulic oil, which is applied in the field of hydraulic oil and can solve the problems of insufficient brake performance and other measures

Inactive Publication Date: 2010-10-20
SHELL INT RES MAATSCHAPPIJ BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since oily additives must also be incorporated, therein lies the problem of not addressing adequate measures of brake performance when utilizing wet discs

Method used

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  • Hydraulic oil for use in construction machinery
  • Hydraulic oil for use in construction machinery
  • Hydraulic oil for use in construction machinery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] Embodiment 1, Reference Example 1, Comparative Examples 1-4:

[0081] Lubricating oil compositions of Example 1 and Comparative Examples 1 and 2 were prepared according to the formulations shown in Tables 1 and 2 using the aforementioned materials. Reference example is commercial diesel engine oil, JASODH-1 SAE 10W (Characteristics: kinematic viscosity at 40°C, 36.2mm 2 / s; kinematic viscosity at 100°C, 6.04mm 2 / s; viscosity index, 112), comparative example 3 is commercial wear-resistant hydraulic oil, ISOVG46 (characteristic: the kinematic viscosity at 40 ℃, 48.4mm 2 / s; kinematic viscosity at 100°C, 6.99mm 2 / s; viscosity index, 100), and Comparative Example 4 is a commercial wear-resistant hydraulic oil, ISOVG100 (feature: kinematic viscosity at 40°C, 103.3mm 2 / s; kinematic viscosity at 100°C, 11.5mm 2 / s; viscosity index, 98).

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Abstract

Hydraulic oil for use in construction machinery, wherein the hydraulic oil comprises a poly(meth)acrylate of weight average molecular weight in the range of from 30,000 to 100,000 in a highly refined base oil but does not incorporate an oiliness agent, and wherein the kinetic viscosity at 60 DEG C is in the range of from 25 to 60 mm<2> / s, the kinetic viscosity at 80 DEG C is in the range of from 15 to 34 mm<2> / s, the viscosity index is in the range of from 200 to 220, and the low temperature cranking viscosity at 25 DEG C is in the range of from 1000 to 8000 mPa.s. The hydraulic oil of the present invention not only has a high kinetic viscosity in the high-temperature domain even though the incorporation of an oiliness agent is omitted, and can thereby effect satisfactory operation efficiently and which has excellent braking characteristics, but which also has a low viscosity in the low-temperature domain and so has excellent low-temperature performance.

Description

technical field [0001] The present invention relates to hydraulic oils for use in construction machines, and more particularly to hydraulic oils for use in hydraulic equipment of construction machines to drive hydraulic equipment, including hydraulic drives such as hydraulic motors and hydraulic cylinders in construction machines. Background technique [0002] Construction machines use hydraulic equipment including hydraulic drive devices such as hydraulic motors and hydraulic cylinders. In these construction machines, hydraulic oil pressurized by an engine running a hydraulic pump is delivered to hydraulic driving devices such as hydraulic motors and hydraulic cylinders, or other hydraulic equipment, thereby operating the hydraulic equipment. In hydraulic equipment including these hydraulic drive devices, a hydraulic circuit is formed leading from a hydraulic pump operated by an engine and through a path provided with hydraulic devices such as pilot valves, control valves, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M145/14C10M169/04C10N20/02C10N20/04C10N40/08
CPCC10N2220/021C10M2203/1025C10N2240/10C10M2209/084C10N2240/08C10N2230/02C10N2230/06C10M169/044C10N2230/08C10M145/14C10M2223/045C10N2220/022C10M2215/08C10N2020/04C10N2020/02C10N2030/02C10N2030/08C10N2030/06C10N2040/25C10N2040/08C10N2010/04
Inventor 大津裕彦安部川利治广泽敦彦
Owner SHELL INT RES MAATSCHAPPIJ BV