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Rolling bearing

A rolling bearing and rolling element technology, applied in the field of rolling bearings, can solve the problems of increased mechanical shear resistance, low dynamic viscosity, and reduced supply, and achieve the effects of improving sound durability, reducing friction, and inhibiting deterioration

Inactive Publication Date: 2002-07-10
NSK LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, when the dynamic viscosity of the base oil is lowered, as described above, in the motor of the air conditioner, it is difficult to ensure the thickness of the oil film due to the relatively low-speed operation by the frequency conversion control.
Generally, oils with low dynamic viscosity have low heat resistance and cause problems with sound durability.
On the other hand, reducing the consistency of grease requires increasing the ratio of thickener, so the amount of base oil in the grease will be relatively reduced, and the mechanical shear resistance of the grease will increase. As a result, the effect of base oil on the lubricating surface of the bearing The supply amount will decrease, and the lubricity cannot be maintained stably for a long time

Method used

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Examples

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Effect test

Embodiment 1～11、 comparative example 1～5

[0063] Table 1, Table 2 and Table 3 show the grease composition and properties of Examples 1-11 and Comparative Examples 1-5. In addition, the grease composition is a grease composition with a total amount of 1000 g in which 50 g of additives (carboxylic acid, antioxidant, rust inhibitor, metal deactivator, etc.) are added to a total amount of 950 g of lithium soap and base oil. In addition, the dynamic viscosity (40 degreeC) of a base oil (mixture oil containing a polar base lubricating oil and a non-polar lubricating oil) is also shown in a table|surface. The preparation method is: dissolve hydroxystearic acid in various non-polar lubricating oils, make it react with lithium hydroxide to form lithium soap, heat the lithium soap to above 210°C, and dissolve it in each polar-based lubricating oil, Then, keep it at 200°C for about 60 minutes, then cool it down to 140°C at a rate of 1°C / min, and then add additional base oil heated to 140°C when it drops below 140°C (synthetic hy...

Embodiment 1

[0067] Example 1: The groove R of the inner ring track = 51.75%, the groove R of the outer ring track = 53.0%,

Embodiment 2

[0068] Example 2: The groove R of the inner ring track = 51.0%, the groove R of the outer ring track = 53.0%,

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PUM

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Abstract

A rolling bearing to exhibit outstanding initial (cage) acoustic characteristics at the start of operation under a low temperature atmosphere, suppress fretting damages (abrasions) and reduce bearing torque by making the radius of curvature of the cross-sectional shape of the inner raceway and the radius of curvature of the cross-sectional shape of the outer raceway equal to 51.0% to smaller than 60.0% of the diameter of the rolling element, and packing a grease composition comprising a base oil that is a mixture of a lubricant containing a polar group in its molecular structure and a non-polar lubricant and a metallic soap-based thickener containing a long-fiber material with a major axis part length of at least 3 mum.

Description

technical field [0001] The present invention relates to rolling bearings for various motors used in general industries, and in particular to rolling bearings that improve retainer sound at low temperatures and reduce fretting damage (wear) and bearing torque. Background technique [0002] A driving motor device for an air conditioner (hereinafter referred to as "air conditioner") can be cited as an example of general industrial use. In recent years, the air conditioner has been developing toward higher performance and multifunctionality. For example, after the room temperature is lowered in a short time by rapid cooling through high-speed operation, it is a technology to maintain a constant room temperature by operating at a low speed through frequency conversion control. Accordingly, low-noise operation technology is required to suppress the exhaust sound of air and the rotation sound of the motor during low-speed operation. However, during low-speed operation, the cooling...

Claims

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Application Information

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IPC IPC(8): C10M169/00C10M169/02F16C33/58F16C33/66
CPCC10N2210/02C10M169/00F16C33/6614C10N2210/03C10N2210/01C10M2205/0206C10M2207/0406C10M2207/1285C10M2207/2815C10M169/02C10M2207/34C10M2207/146C10M2207/2835F16C33/6633C10M2207/2845F16C33/58C10M2207/2825C10M2207/325C10M2207/1206C10N2240/02C10N2250/10C10N2220/022C10N2010/02C10N2010/04C10N2010/06C10N2020/02C10N2040/02C10N2050/10F16C19/06F16C33/585F16C2240/76
Inventor 杉森庸一郎住谷寿夫中道治小川隆司寺田康久
Owner NSK LTD
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