Grease for high-speed bearing and rolling bearing for high speed

A technology for high-speed bearings and rolling bearings, applied to shafts and bearings, bearing components, lubricating compositions, etc., to achieve the effects of extending the grease life, improving the durability life, and improving the oil film forming ability

Inactive Publication Date: 2010-01-06
NTN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the increase in the rotational speed of such bearings, it is difficult for existing greases to satisfy all the performances required by bearings.

Method used

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  • Grease for high-speed bearing and rolling bearing for high speed
  • Grease for high-speed bearing and rolling bearing for high speed
  • Grease for high-speed bearing and rolling bearing for high speed

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～ Embodiment 9

[0186] The urea-based grease shown in Table 1 and the non-urea-based grease were mixed in the ratio shown in Table 2 to obtain a grease sample. This grease sample was used in the above-mentioned centrifugal oil separation test and the room temperature high-speed grease test shown below to measure the centrifugal oil separation degree and grease life time. These measurement results are listed in Table 2 together.

[0187] In addition, as the non-urea grease (grease NU7) of Example 9, ISOFLEX NBU 15 manufactured by NOK Kluber was used.

Embodiment 10～ Embodiment 13

[0213] The urea-based grease shown in Table 3 and the non-urea-based grease were mixed in the ratio shown in Table 4 to obtain a grease sample. This grease sample was used in the above-mentioned centrifugal oil separation test and the room temperature high-speed grease test shown below to measure the centrifugal oil separation degree and grease life time. These results are listed in Table 4 together.

Embodiment 14～ Embodiment 17

[0226] The urea-based grease shown in Table 3 and the non-urea-based grease were mixed in the ratio shown in Table 5 to obtain a grease sample. This grease sample was used in the above-mentioned centrifugal oil separation test and the room temperature high-speed grease test shown below to measure the centrifugal oil separation degree and grease life time. These results are listed in Table 5 together.

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Abstract

A grease for high-speed bearing and rolling bearing for high speed that enable satisfactorily coping with a high-speed rotation of 170x10<4> or higher dmN value and enable realizing compaction of machine tool and cutback of operating costs. The grease is one comprising a mixture of urea grease containing a urea compound as a thickener and nonurea grease not containing the urea compound, wherein the urea compound is one obtained by reaction between a polyisocyanate component and a monoamine component, the monoamine component containing 50 mol% or more of at least one monoamine selected from among aliphatic monoamines and alicyclic monoamines based on all the monoamines. Rolling bearing for high speed (1) is one comprising inner ring (2), outer ring (3), multiple rolling elements (4) interposed between the inner ring (2) and the outer ring (3) and seal member (6), wherein the above grease (8) is hermetically introduced around the rolling elements(4).

Description

technical field [0001] The present invention relates to a high-speed bearing grease used in a rolling bearing supporting a high-speed rotating shaft such as a machining tool spindle (spindle), and a high-speed rolling bearing sealed with the grease. Background technique [0002] In order to improve the processing efficiency, the spindle of the processing tool is preferably rotated at high speed, and various lubrication technologies are applied in the bearing. As a lubrication method suitable for a spindle rotating at a high speed, methods such as oil mist lubrication, air-oil lubrication, and jet lubrication are known, for example. [0003] However, such a lubrication method requires additional equipment such as compressed air and an oil supply device, which is one of the reasons for increasing the initial cost and operating cost of the processing tool. Compared with this, grease lubrication can be said to be the preferred method that requires less maintenance. method of lu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M123/02C10M105/04C10M105/18C10M105/32C10M115/08C10M117/00C10M117/02C10M117/10F16C33/32F16C33/58F16C33/66C10N10/02C10N20/02C10N30/06C10N40/02C10N50/10
Inventor 川村隆之三上英信玉田健治
Owner NTN CORP
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