Grease, rolling bearing, constant velocity joint and rolling parts

A technology for rolling bearings and rotating parts, applied in the field of lubricating grease, can solve problems such as lubricating oil film rupture, and achieve the effect of preventing wear

Inactive Publication Date: 2007-02-21
NTN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, the rolling bearing has a bearing ring, and the rotating body and the track ring are convexly sliding on the ring part, so there is a problem that the lubricant film is easily broken on the ring part.

Method used

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  • Grease, rolling bearing, constant velocity joint and rolling parts
  • Grease, rolling bearing, constant velocity joint and rolling parts
  • Grease, rolling bearing, constant velocity joint and rolling parts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～ Embodiment 11

[0163] In the reaction vessel, add a thickener to the base oil and homogenize it with a three-roll mill to obtain the lithium soap / mineral oil-based grease shown in Table 1 (40°C base oil viscosity 100mm 2 / s, mixed consistency 220), urea / PAO oil grease (base oil viscosity 46mm at 40°C 2 / s, mixed consistency 280), lithium soap / ester oil-based grease (base oil viscosity 33mm at 40°C 2 / s, mixed consistency 250), urea / ether oil-based grease (40°C base oil viscosity 100mm 2 / s, mixing consistency 300).

[0164] Furthermore, bismuth or inorganic bismuth was used as an extreme pressure agent, and was added to the above-mentioned grease at the ratio shown in Table 1 to prepare the grease of each example. The obtained grease was subjected to the following extreme pressure resistance evaluation test and rolling bearing test, and the results are shown in Table 1.

Embodiment 12

[0189] Immerse a steel plate (SUJ2 thickness 10mm) and a φ40mm× For a ring test piece (SUJ2) with a thickness of 10 mm, the end surface of the ring test piece was pressed against the steel plate with a load of 490 N, and the ring test piece was rotated at 2000 rpm for 20 hours. The bismuth trioxide film was formed on the end surface of the ring test piece due to frictional heat at this time and the like. Surface analysis by photoelectric spectroscopy (hereinafter abbreviated as XPS) confirmed that a coating of bismuth trioxide was formed on the end face of the ring-shaped test piece.

[0190] Using two of these ring-shaped test pieces, the following extreme pressure resistance evaluation test was implemented. show the result in Figure 14 .

Embodiment 13

[0192] Dip a steel plate (SUJ2 thickness 10mm) and φ40mm×thickness 10mm in a liquid with a ratio of 95g of PAO oil (Silver 801, manufactured by Nippon Steel Chemical Co., Ltd.) and 5g of bismuth (manufactured by Wako Pure Chemical Industries, Ltd.). For the ring test piece (SUJ2), the end face of the ring test piece was pressed against the steel plate with a load of 490N, and the ring test piece was rotated at 2000 rpm for 20 hours. Due to the frictional heat at this time, a bismuth coating was formed on the end surface of the ring test piece.

[0193] Surface analysis by XPS confirmed that a bismuth coating was formed on the end surface of the ring test piece.

[0194] As two of the ring test pieces, the following extreme pressure resistance evaluation test was implemented. show the result in Figure 14 .

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Abstract

The present invention provides a grease capable of preventing wear on a lubricated surface, excellent in deflection prevention performance, heat resistance, and long-term durability, and a rolling bearing, a constant velocity coupling, and a rotating part filled with the grease. The grease is prepared by adding at least one substance selected from bismuth and inorganic bismuth in an amount of 0.01 to 15% by weight relative to the total amount of grease to a base grease prepared by blending at least a thickener with a base oil. Inorganic bismuth is at least one inorganic bismuth selected from bismuth sulfate, bismuth trioxide, bismuth carbonate and sodium bismuthate, the above-mentioned grease is used for rolling bearings and constant velocity couplings, and the rotating parts are formed on their surfaces selected from bismuth and inorganic bismuth A coating of at least one substance.

Description

technical field [0001] The present invention relates to a lubricating grease under high load and excellent load resistance, a rolling bearing and a constant velocity coupling in which the grease is sealed, and a grease used for airplanes, railway vehicles, construction machinery, automobile electrical equipment auxiliary equipment, automobiles, etc. Rotating parts such as hubs. [0002] The rolling bearing refers to a rolling bearing for a wheel or a rolling bearing used in a rolling bearing unit for supporting a wheel. Rolling bearings for wheels relate to bearings for axles of railway vehicles, rolling bearings for railway vehicles used for main motor bearings, rolling bearings for vehicle support devices for vehicle suspensions to freely rotate vehicles, and rolling bearings for roll necks of rolling mills. [0003] The average velocity joint relates to a grease for a plunger type average velocity joint or a fixed type average velocity ball joint used in an automobile, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M125/04C10M125/10C10M125/18C10M125/20C10M125/22C10M125/24C10M169/00B60B35/18B61F17/30F03D11/00F16C19/26F16C33/66F16C33/78F16D3/20C10M101/02C10M105/18C10M105/32C10M107/02C10M115/08C10M117/02C10N10/02C10N10/10C10N20/02C10N30/06C10N30/08C10N40/02C10N50/10
Inventor 三上英信
Owner NTN CORP
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