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Grease for hub bearings and hub bearing

A technology for wheel hub bearings and grease, applied in the directions of bearing elements, shafts and bearings, lubricating compositions, etc., can solve the problems of not achieving the improvement of the starting point peeling of the wheel hub bearing resistance surface, poor durability, weak surface strength, etc. The effect of starting point peeling

Inactive Publication Date: 2008-06-04
NTN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the small alloy composition and weak surface strength, the resistance to surface peeling is worse than that of bearing steel
Therefore, using the same lubrication method as GEN1, the durability is poor in the case of severe service conditions
[0005] For the improvement of lubricating grease for hub bearings, it is known to reduce the rotational torque by using a low-viscosity base oil (refer to Patent Document 1) or to impart conductivity for static removal (refer to Patent Document 2). Improvement of surface peeling resistance of wheel bearings

Method used

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  • Grease for hub bearings and hub bearing
  • Grease for hub bearings and hub bearing
  • Grease for hub bearings and hub bearing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～ Embodiment 3

[0090] Embodiment 1~Example 3 and Comparative Example 1~Comparative Example 3

[0091] A mineral oil / urea base grease (JIS consistency No. 2 grade, consistency: 265 to 295) in which a urea compound as a thickener was uniformly dispersed in mineral oil as a base oil was prepared. Kinematic viscosity at 2000 g of mineral oil (Super Oil C manufactured by Nippon Oil Co., Ltd. at 40° C.): 100 mm 2 / sec), 193.5g of diphenylmethane-4,4'-diisocyanate, 82.8g of p-toluidine and 76.6g of cyclohexylamine were reacted to uniformly disperse the generated urea compound to obtain a basic lubricant fat. To this base grease, the additives shown in Table 1 were blended to obtain a grease for hub bearings.

[0092] In addition, 1 part by weight of sorbitan trioleate as an antirust additive, 1 part by weight of calcium sulfonate, and 2 parts by weight of alkyl diphenylamine as an antioxidant were added to 100 parts by weight of the above-mentioned lubricating grease for hub bearings. .

[0093...

Embodiment 4

[0095] A mineral oil / urea base grease (JIS consistency No. 2 grade, consistency: 265 to 295) in which a urea compound as a thickener was uniformly dispersed in mineral oil as a base oil was prepared. Kinematic viscosity at 2000 g of mineral oil (Super Oil C manufactured by Nippon Oil Co., Ltd. at 40° C.): 100 mm 2 / sec), react 149.5g of diphenylmethane-4,4'-diisocyanate, 64.0g of p-toluidine and 59.2g of cyclohexylamine to disperse the generated urea compound evenly, and obtain a basic lubricant fat. To this base grease, the additives shown in Table 1 were blended to obtain a grease for hub bearings.

[0096] In addition, 1 part by weight of sorbitan trioleate as an antirust additive, 1 part by weight of calcium sulfonate, and 2 parts by weight of alkyl diphenylamine as an antioxidant were added to 100 parts by weight of the above-mentioned lubricating grease for hub bearings. .

[0097] The obtained grease for hub bearings was evaluated in the same manner as in Example 1. ...

Embodiment 5

[0099] A mineral oil / urea base grease (JIS consistency No. 2 grade, consistency: 265 to 295) in which a urea compound as a thickener was uniformly dispersed in mineral oil as a base oil was prepared. Kinematic viscosity at 2000 g of mineral oil (Super Oil C manufactured by Nippon Oil Co., Ltd. at 40° C.): 100 mm 2 / sec), 309.2g of diphenylmethane-4,4'-diisocyanate, 132.4g of p-toluidine and 122.5g of cyclohexylamine were reacted to uniformly disperse the generated urea compound to obtain a basic lubricant fat. Additives shown in Table 1 were blended with this base grease to obtain a grease for hub bearings.

[0100] In addition, 1 part by weight of sorbitan trioleate as an antirust additive, 1 part by weight of calcium sulfonate, and 2 parts by weight of alkyl diphenylamine as an antioxidant were added to 100 parts by weight of the above-mentioned lubricating grease for hub bearings. .

[0101] The obtained grease for hub bearings was evaluated in the same manner as in Exampl...

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Abstract

The present invention provides a hub bearing, made of carbon steel for machine structural use, which has a long life even in a strict lubricating condition by improving the resistance to peeling starting from the surface. A grease for the hub bearing contains a base oil, a thickener, and an organozinc compound which is at least one compound selected from dithiozinc carbamate and dithiozinc phosphate. The base oil is a mineral oil or a mixed oil of a mineral oil and a synthetic hydrocarbon oil. The thickener is a urea compound shown by the following formula (1) and is contained at 1 to 40 mass % for the entire grease. The grease for the hub bearing is enclosed in the hub bearing. (In the formula (1), R 2 indicates an aromatic hydrocarbon group having 6 to 15 carbon atoms, and R 1 and R 3 indicate at least one hydrocarbon group selected from an alicyclic hydrocarbon group and an aromatic hydrocarbon group.

Description

technical field [0001] The present invention relates to a lubricating grease for a hub bearing and a hub bearing for rotatably supporting an automobile wheel. Background technique [0002] As of the 1970s, for automotive wheel bearings, a design in which two standard bearings conforming to the ISO standard were arranged was the mainstream. In the 1980s, in order to improve assembly, automobile manufacturers adopted double-row angular contact ball bearings or double-row tapered roller bearings in which the outer ring of the back-to-back bearing was integrated. These are called first generation hub bearings (GEN1). 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 a car. In addition, a double-row bearing called the second-generation hub bearing (GEN2) with a flange on the outer wheel has also been developed. This is a reduction in the number of...

Claims

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Application Information

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IPC IPC(8): C10M169/00C10M101/02C10M105/04C10M107/08C10M115/08C10M135/18C10M137/10F16C33/62F16C33/66C10N10/04C10N30/06C10N40/02C10N50/10
Inventor 江上正树南政美
Owner NTN CORP
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