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Rolling bearing

A technology of rolling bearings and rolling elements, applied in the field of rolling bearings, can solve the problems of increased mechanical shear resistance, low kinematic viscosity, and reduced supply, and achieve the effects of improving sound durability, suppressing deterioration, and reducing friction.

Inactive Publication Date: 2006-05-03
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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Effect test

Embodiment 1～11、 comparative example 1～5

[0063] Table 1, Table 2, and Table 3 show the composition and properties of the greases of Examples 1 to 11 and Comparative Examples 1 to 5. In addition, the grease composition is a grease composition composed of a total of 1000 g of lithium soap and base oil added with 50 g of additives (carboxylic acid, antioxidant, rust inhibitor, metal deactivator, etc.) to a total of 950 g. In addition, the kinematic viscosity (40°C) of the base oil (mixed oil containing polar base lubricating oil and non-polar lubricating oil) is also shown in the table. The preparation method is: dissolve hydroxystearic acid in each non-polar lubricating oil, make it react with lithium hydroxide to produce lithium soap, heat the lithium soap to 210°C or more, and dissolve it in each polar group-containing lubricating oil. Then, keep at 200°C for about 60 minutes, then cool to 140°C at a rate of 1°C / min, and then add additional base oil heated to 140°C (synthetic hydrocarbon oil + polar Base lubricating oil)...

Embodiment 1

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

Embodiment 2

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

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Abstract

A rolling bearing that can improve the initial sound (ring sound) characteristics of the bearing when starting operation in a low-temperature environment, reduce fretting damage (wear), and reduce the bearing torque. The curvature radius of the cross-sectional shape of the inner ring track and the curvature radius of the cross-sectional shape of the outer ring track are 51.0 to 60.0% of the diameter of the rolling element. A grease composition is sealed in the rolling bearing, and the grease composition is based on A lubricating grease composition formed by adding a metallic soap thickener to oil, wherein the base oil is composed of a mixture of a lubricating oil with polar groups in the molecular structure and a non-polar lubricating oil, and the metallic soap thickener The thickener includes long fibrous materials with a major diameter length of 3 μm or more.

Description

Technical field [0001] The present invention relates to various rolling bearings for motors used in general industries, and particularly relates to rolling bearings that improve retainer sound at low temperatures and reduce fretting wear damage (wear) and bearing torque. Background technique [0002] As an example for general industrial use, a drive motor device for an air conditioner (hereinafter referred to as an "air conditioner") can be cited. In recent years, the air conditioner has been developing towards higher performance and multi-functionality. For example, after high-speed operation and rapid cooling to reduce the room temperature in a short time, the technology of maintaining a constant room temperature at low-speed operation through inverter control. Along with this, a low-noise operation technology that suppresses the exhaust sound of air and the rotating sound of the motor during low-speed operation is required. However, during low-speed oper...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16C33/66C10M101/00C10M169/00C10M169/02F16C33/58
CPCC10M169/00C10M169/02C10M2205/0206C10M2207/0406C10M2207/1206C10M2207/1285C10M2207/146C10M2207/2815C10M2207/2825C10M2207/2835C10M2207/2845C10M2207/325C10M2207/34C10N2010/02C10N2010/04C10N2010/06C10N2020/02C10N2040/02C10N2050/10F16C19/06F16C33/585F16C33/6633F16C2240/76
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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