Title:
HYDRAULIC OIL COMPOSITION FOR BUFFER
Document Type and Number:
Japanese Patent JP3844892
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To obtain a hydraulic oil compsn. for buffers, which is excellent in low-temp. viscosity characteristics, vaporizability, and shear stability and has a stable damping power at from low to high temps.
SOLUTION: This compsn, is prepd, by compounding, based on the compsn., at least 94 wt.% base oil comprising a mixed mineral oil consisting of (a) a deeply dewaxed mineral oil and (b) a low-viscosity mineral oil in a wt, ratio of (97/3)-(99/1) with 4-6 wt.% non-dispersion-type polymethacrylate viscosity index improver as an additive, and has a kinematic viscosity of 3-3.5 mm2/s at 100°C and 20.5-23.5 mm2/s at 20°C, a viscosity index of 160-170, a Brookfield viscosity of 1,350-1,600 mPa.s at -40°C, an amt. of NOACK evaporation of 6 wt.% or lower, and a viscosity decrease of 7% or lower at 100°C in the shear stability test by the sound wave method.
Inventors:
Eiji Kamada
Hiroshi Ohashi
Naoto Otsuka
Nakatani Yoshitaka
Ueno Kenji
Hiroshi Ohashi
Naoto Otsuka
Nakatani Yoshitaka
Ueno Kenji
Application Number:
JP28802498A
Publication Date:
November 15, 2006
Filing Date:
October 09, 1998
Export Citation:
Assignee:
TonenGeneral Sekiyu KK
TOYOTA JIDOSHA KABUSHIKI KAISHA
TOYOTA JIDOSHA KABUSHIKI KAISHA
International Classes:
C10M169/04; C10M101/02; C10M145/14; C10N20/00; C10N20/02; C10N20/04; C10N30/02; C10N30/06; C10N30/08; C10N40/08; F16F9/32; (IPC1-7): C10M169/04; //(C10M169/04; C10M101:02; C10M145:14; C10N30:02; C10N30:06; C10N30:08; C10N40:08)
Domestic Patent References:
| JP63280797A | ||||
| JP7258675A | ||||
| JP4314794A | ||||
| JP5247482A | ||||
| JP5247486A | ||||
| JP63210197A | ||||
| JP63309592A |
Attorney, Agent or Firm:
Kenji Kawabi