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Rolling bearing

A rolling bearing and rolling contact technology, applied in the field of rolling bearings, can solve the problems of moisture intrusion into bearings, achieve the effect of suppressing the reduction of bearing life and excellent rolling fatigue resistance

Inactive Publication Date: 2018-06-08
NTN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, when exposed to wind and rain in industrial equipment used outdoors, or when cooling water is used for product processing using this equipment, moisture may enter the bearing.

Method used

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Experimental program
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Effect test

Embodiment

[0039] A test piece was prepared by applying coating treatment to a cylindrical roller (bearing steel). The phosphate coating to be formed is a manganese phosphate coating, and is formed by immersing the above-mentioned cylindrical roller in a manganese phosphate treatment solution. A plurality of test pieces having different film thicknesses and crystal sizes were prepared by changing various conditions.

[0040] For this test piece, the steam turbine oil VG68 was forced to circulate oil at a contact surface pressure of 4.16GPa and a load speed of 20400cpm under the line contact of the cylindrical rollers, and the load time until peeling occurred was measured. Resistance to rolling fatigue (peel time (min)). The relationship between film thickness and peeling time is shown in Figure 4 In, the crystal size (projected area 25μm 2 The relationship between the above crystallization ratio) and the peeling time is shown in Figure 5 , the film thickness and crystal size (proje...

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PUM

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Abstract

Provided is a rolling bearing, wherein rust is prevented by a coating of phosphate being formed on the rolling contact surface of a bearing member, and the reduction in bearing service life is minimized. A rolling bearing 1 has a phosphate coating 6 over the entire inner ring surface including an inner ring track surface 2a, the entire outer ring surface including an outer ring track surface 3a, and the entire rolling element surface including the rolling surface 4a of a rolling element 4. The thickness of the phosphate coating 6 is 6 [mu]m or more. When the surface of the coating is viewed from just above, 30% or more of the whole projected area of the coating is formed from a crystal grain with a projected area of 25 [mu]m2 or more.

Description

technical field [0001] The present invention relates to rolling bearings, in particular to rolling bearings used in general industrial equipment. Background technique [0002] Rolling bearings are known as equipment elements used as sliding mechanisms of equipment. In the case of rolling bearings, since the plurality of rolling elements arranged between the inner ring and the outer ring continuously roll, contact stress is continuously applied to the inner ring, outer ring, rolling elements, and cage that are the constituent members of the rolling bearing. . In addition, when exposed to wind and rain in industrial equipment used outdoors, or when cooling water or the like is used for product processing using the equipment, moisture may intrude into the bearing. Therefore, it is important to suppress rolling fatigue caused by long-term operation and rust caused by moisture to prevent functional deterioration of equipment. [0003] In view of this point, rolling bearings wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16C33/62F16C19/26F16C19/36F16C33/34F16C33/64F16C33/66
CPCF16C33/64F16C19/26F16C33/34F16C33/62F16C33/66
Inventor 户田耕平伊藤秀司森内光洋
Owner NTN CORP
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