Waterproof grease and hermetically filled with the grease, rolling bearing and hub bearing

A grease, non-aqueous technology, used in the field of rolling bearings and wheel hub bearings, to achieve the effect of inhibiting surface starting point peeling

Inactive Publication Date: 2008-09-24
NTN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, due to the presence of water in the bearing, rust occurs inside the bearing

Method used

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  • Waterproof grease and hermetically filled with the grease, rolling bearing and hub bearing
  • Waterproof grease and hermetically filled with the grease, rolling bearing and hub bearing
  • Waterproof grease and hermetically filled with the grease, rolling bearing and hub bearing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 and Embodiment 2

[0122] A mineral oil / urea base grease (JIS consistency No. 2 grade, consistency: 265 to 295) obtained by uniformly dispersing a urea compound as a thickener in mineral oil as a non-aqueous base oil was prepared.

[0123] Kinematic viscosity at 2000g of mineral oil (TAIBIN 100 manufactured by Nippon Oil Corporation, at 40°C): 100mm 2 / sec), 231.7 g of diphenylmethane-4,4'-diisocyanate, 86.2 g of aniline, and 91.7 g of cyclohexylamine were reacted to uniformly disperse the generated urea compound to obtain a base grease. Additives were blended to this base grease in the blends shown in Table 1 to obtain test greases.

[0124] The obtained test grease was subjected to an oil film formation rate test 1 and a water dispersion confirmation test shown below, and the oil film formation rate, the mixing method with water, and the water particle size were measured. The results are summarized in Table 1.

[0125]

[0126] Bearings used: The angular contact ball bearing 7006ADLLB is s...

Embodiment 3 and comparative example 1～ comparative example 2

[0132] A mineral oil / urea base grease (JIS consistency No. 2 grade, consistency: 265 to 295) obtained by uniformly dispersing a urea compound as a thickener in mineral oil as a base oil was prepared.

[0133] Kinematic viscosity at 2000g of mineral oil (Nippon Oil Co., Ltd.'s Super C, 40°C): 100mm 2 / sec), 234.8 g of diphenylmethane-4,4'-diisocyanate and 174.8 g of aniline were reacted to uniformly disperse the generated urea compound to obtain a base grease. Additives were blended to this base grease in the blends shown in Table 1 to obtain hub bearing grease.

[0134] The obtained grease for hub bearings was evaluated in the same manner as in Example 1. The results are summarized in Table 1.

[0135] [Table 1]

[0136]

[0137] 1) Kinematic viscosity at 40°C of Tabin 100 manufactured by Nippon Oil Corporation: 100mm 2 / Second

[0138] 2) Aniline

[0139] 3) Cyclohexylamine

[0140] 4) スルホール CA-45 manufactured by Matsumura Petroleum Co., Ltd.

[0141] 5) Reagents man...

Embodiment 4～ Embodiment 14

[0146] Embodiment 4~Example 14 and Comparative Example 3~Comparative Example 8

[0147] A mineral oil / urea base grease (JIS consistency No. 2 grade, consistency: 265 to 295) obtained by uniformly dispersing a urea compound as a thickener in mineral oil as a non-aqueous base oil was prepared.

[0148] Kinematic viscosity at 2000g of mineral oil (TAIBIN 100 manufactured by Nippon Oil Corporation, at 40°C): 100mm 2 / sec), 231.7 g of diphenylmethane-4,4'-diisocyanate, 86.2 g of aniline, and 91.7 g of cyclohexylamine were reacted to uniformly disperse the generated urea compound to obtain a base grease. Additives were blended into this base grease in the blends shown in Tables 2 and 3 to obtain test greases.

[0149] The obtained test grease was supplied to the following oil film formation rate test 2, bearing life test, and saturated water content measurement, and the oil film formation rate, bearing life time, saturated water content, and the presence or absence of rust were mea...

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Abstract

A waterproof grease that even under harsh lubrication conditions such as those causing water mixing in grease at the time of bearing operation, improves the resistance to surface starting peeling of bearing of, for example, carbon steel for mechanical structure; and making use of the grease and exhibiting prolonged life, a rolling bearing and hub bearing. There is provided a waterproof grease comprising a nonaqueous base oil, a thickening agent and, as an additive, a water dispersant, wherein the saturated water content dispersible in the waterproof grease is in the range of 30 to 60 wt.%, and wherein the water dispersant capable of dispersing water in the waterproof grease is a surfactant, and wherein the nonaqueous base oil is a mineral oil and the thickening agent is a urea compound. Further, there are provided, hermetically filled with the grease, a rolling bearing and hub bearing.

Description

technical field [0001] The present invention relates to a water-resistant grease sealed in a bearing used in an environment where there is a risk of water contamination, a rolling bearing and a hub bearing filled with the grease. Background technique [0002] Vehicle bearings (hub bearings) for automobiles, which can be cited as a representative example of bearings used in water-immersed environments, until the 1980s, in order to improve assembly, automobile manufacturers began to adopt the outer ring of the bearing with the back face aligned Integrated double row angular contact ball bearings or double row tapered roller bearings. It is called the first generation hub bearing. By integrating the outer ring, the initial axial clearance can be set to an appropriate value when the bearing is assembled, so preload adjustment is not required when assembling to the car. In addition, a double-row bearing called a second-generation hub bearing in which a flange portion is provide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M169/00C10M101/02C10M105/04C10M107/02C10M115/08C10M129/76C10M133/06C10M137/10C10M145/26C10M159/24F16C19/18F16C33/62F16C33/66C10N10/04C10N30/00C10N30/06C10N40/02C10N50/10
Inventor 佐藤洋司江上正树
Owner NTN CORP
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