Solid anti-friction devices – materials therefor – lubricant or se – Lubricants or separants for moving solid surfaces and... – Organic compound containing boron
Patent
1996-03-28
1998-05-26
Johnson, Jerry D.
Solid anti-friction devices, materials therefor, lubricant or se
Lubricants or separants for moving solid surfaces and...
Organic compound containing boron
508295, C10M14110
Patent
active
057564299
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The present invention relates to a lubricating oil composition for a high-speed gear. More specifically, it relates to a lubricating oil composition which has a sufficient hypoid gear performance (extreme-pressure properties), can inhibit the formation of a sludge, can particularly be used as a gear oil for a transmission equipped with a high-speed rotating shaft having a peripheral speed of 10 m/sec or more, and is also useful as a gear oil for a superhigh-speed transmission having a peripheral speed of more than 20 m/sec.
2. Background Art
Heretofore, as a gear oil for vehicles, a sulfur-phosphorus extreme-pressure additive blending oil has usually been used. However, when such a sulfur-phosphorus extreme-pressure additive blending oil is used for a transmission having a peripheral speed of more than 10 m/sec, a seal portion is locally heated, so that a sludge is formed and a trouble such as a damage to a seal lip portion often occurs. Therefore, for the high-speed rotating shaft, a non-contact seal mechanism has been used and slight oil leakage has unavoidably been allowed, or measures have been taken by the replacement of the oil at an early stage.
Thus, it has been desired to develop a lubricating oil for a high-speed gear which has sufficient extreme-pressure properties and can inhibit the (Indiana Stirring Oxidation Test) (150.degree. C., 96 hours) is 0.1 wt % or less!.
Under such circumstances, the present invention has been intended, and an object of the present invention is to provide a lubricating oil composition for a high-speed gear which has a sufficient hypoid gear performance, can inhibit the formation of a sludge, and permits the prolongation of the life of an oil seal member for use in a high-speed and/or a high-temperature rotating portion.
Disclosure of the Invention
The present inventor has intensively researched with the intention of developing a lubricating oil composition for a high-speed gear having the above-mentioned preferable characteristics. As a result, it has been found that the above-mentioned object can be attained by blending a specific base oil having a % C.sub.A of 5 or less with three components of a sulfur additive, a phosphorus additive and a nitrogen additive in a predetermined ratio. In consequence, the present invention has been completed on the basis of this knowledge.
That is to say, the present invention is directed to
(1) a lubricating oil composition for a high-speed gear which is obtained by blending a base oil having a % C.sub.A of 5 or less with a sulfur additive, a phosphorus additive and a nitrogen additive so that an element ratio 100N/(S+P) in the composition may be in the range of 4 to 10 by weight,
(2) a lubricating oil composition for a high-speed gear which is obtained by blending a base oil having a % C.sub.A of 5 or less and having a nitrogen content of 50 ppm or less and a sulfur content of 50 ppm or less with a sulfur additive, a phosphorus additive and a nitrogen additive so that an element ratio 100N/(S+P) in the composition may be in the range of 4 to 10 by weight,
(3) a lubricating oil composition for a high-speed gear which is obtained by blending a base oil having a % C.sub.A of 5 or less with a sulfur additive, a phosphorus additive and a nitrogen additive so that an element ratio 100N/(S+P) in the additives may be in the range of 4 to 10 by weight, and
(4) a lubricating oil composition for a high-speed gear which is obtained by blending a base oil having a % C.sub.A of 5 or less and having a nitrogen content of 50 ppm or less and a sulfur content of 50 ppm or less with a sulfur additive, a phosphorus additive and a nitrogen additive so that an element ratio 100N/(S+P) in the additives may be in the range of 4 to 10 by weight.
In a lubricating oil composition of the present invention, a base oil having a %C.sub.A of 5 or less, preferably 3 or less is used. If this %C.sub.A is in excess of 5, an oxidative stability deteriorates and the formation of a sludge increases. Furthermore, the base oil suitably h
REFERENCES:
patent: 4812246 (1989-03-01), Yabe
patent: 5225093 (1993-07-01), Campbell et al.
patent: 5372703 (1994-12-01), Kamiya et al.
patent: 5605880 (1997-02-01), Arai
Idemitsu Kosan Co. Ltd.
Johnson Jerry D.
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