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Grease composition for rolling bearing

Inactive Publication Date: 2020-09-01
NSK LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a grease composition that is resistant to sound and reduces the friction of bearings.

Problems solved by technology

However, when the dynamic viscosity of the base oil is reduced, the desired film thickness can hardly be secured because the fan motor for air conditioner for example may operate at a relatively low speed in an inverter control process.
Further, a base oil having a low dynamic viscosity normally has a low heat resistance and thus causes a problem of acoustic durability.
As a result, the amount of base oil supplied onto the lubricated surface of the bearing is reduced, making it impossible to invariably maintain the desired lubricating properties over an extended period of time.
Thus, the reduction of the dynamic viscosity of base oil and the viscosity of grease is limited.
As mentioned above, although some effective methods for improving acoustic durability have been found, no grease compositions effective for the reduction of bearing torque were obtained.

Method used

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  • Grease composition for rolling bearing
  • Grease composition for rolling bearing
  • Grease composition for rolling bearing

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0047]78 g of 12-hydroxystearic acid and 6.2 g of lithium hydroxide were reacted in 552 g of a poly-α-olefin to produce 80 g of a lithium soap. The lithium soap thus produced was then allowed to cool to room temperature to prepare a gel. The gel thus prepared and 368 g of a polyol ester were then kneaded to prepare a grease composition. The grease composition thus prepared was diluted with hexane, and then attached to a copper mesh having a collodion film applied thereto. The specimen was then observed under transmission electron microscope. As shown in FIG. 1A, a long fiber-like material having a major axis length of not smaller than 3 μm was observed.

example 2

[0048]168 g of stearic acid and 14.2 g of lithium hydroxide were reacted in 705 g of a poly-α-olefin to produce 170 g of a lithium soap. The lithium soap thus produced was then allowed to cool to room temperature to prepare a gel. The gel thus prepared and 125 g of a polyol ester were then kneaded to prepare a grease composition. The grease composition thus prepared was then observed under transmission electron microscope in the same manner as in Example 1. As a result, a long fiber-like material having a major axis length of not smaller than 3 μm was observed.

example 3

[0049]116 g of stearic acid and 9.8 g of lithium hydroxide were reacted in 528 g of a poly-α-olefin to produce 120 g of a lithium soap. The lithium soap thus produced was then allowed to cool to room temperature to prepare a gel. The gel thus prepared and a mixture of 26 g of a polyol ester and 106 g of diphenyl ether were then kneaded to prepare a grease composition. The grease composition thus prepared was then observed under transmission electron microscope in the same manner as in Example 1. As a result, a long fiber-like material having a major axis length of not smaller than 3 μm was observed.

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Abstract

A grease composition for rolling bearing comprising a metal soap-based thickening agent containing a long fiber-like material having a major axis length of at least 3 μm incorporated in a base oil comprising a lubricant having a polar group in its molecular structure and a non-polar lubricant blended in combination.

Description

[0001]This is a reissue application of U.S. Pat. No. 6,482,780, which was filed as U.S. application Ser. No. 09 / 920,331 on Aug. 2, 2001, issued on Nov. 19, 2002, which claims priority to JP 2000-234739, filed Aug. 2, 2000, the disclosures of which are hereby incorporated by reference in their entirety.BACKGROUND OF THE INVENTION[0002]The present invention relates to a grease composition to be enclosed in various rolling bearings.[0003]The trend is for more motors for use in fan for air conditioner and HDD spindle to be reduced in its size and output for the purpose of inhibiting the heat generation taking into account the recent environmental restrictions. Therefore, rolling bearings for these purposes have been required to meet sufficient torque characteristics as important characteristics.[0004]The dynamic friction torque of a rolling bearing occurs due to the friction caused by minute slippage on the rolling contact surface, friction by sliding on the sliding contact surface in t...

Claims

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Application Information

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IPC IPC(8): C10M169/02C10M169/00C10M101/02F16C33/66C10M105/18C10M105/36C10M105/38C10M105/48C10M107/02C10M107/34C10M117/02C10M117/04C10N10/02C10N10/04C10N10/06C10N20/00C10N20/06C10N30/00C10N40/02C10N50/10
CPCC10M169/00C10M169/02C10M2207/1285C10N2050/10C10N2040/02C10N2020/063C10N2010/02C10M2205/0285C10M2207/0406C10M2207/2835
Inventor YOKOUCHI, ATSUSHIKURAISHI, JUNSUGIMORI, YOUICHIROFUJITA, YASUNOBUNAKA, MICHIHARUSHIBAYAMA, ATSUSHIKIMURA, HIROSHI
Owner NSK LTD
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