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lubricant composition

A technology of lubricant composition and enhancer, which is applied in the direction of lubricating composition, thickener, additive, etc., can solve the problem of high cost, and achieve the effects of improved fretting wear resistance and long life of fretting wear resistance

Active Publication Date: 2022-05-03
NSK LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, ceramic balls are expensive compared to commonly used steel balls

Method used

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Embodiment

[0056] The following examples and comparative examples are given to further illustrate the present invention, but the present invention is not limited thereto.

[0057] As shown in Table 1, the kinematic viscosity of polyalphaolefin oil (PAO: 40°C) is 48mm 2 / s) As the base oil, add Cu, Fe, Zn, Mg stearate as metal salt of fatty acid, ZnDTC as metal salt of dithiocarbamate, Each test grease was prepared using isotridecyl acid phosphate ester as a value improver. Adjust the mix consistency to 240 for any test grease. The urea compound is obtained by adding cyclohexylamine and stearylamine to MDI (diphenylmethane diisocyanate) at a molar ratio of cyclohexylamine: stearylamine = 7:3 and reacting product of.

[0058] In addition, the total acid value of the test grease was measured in accordance with JIS K 2501:2003 (neutralization point pH 12).

[0059] Then, using a single thrust ball bearing (nameplate; 51305) with an inner diameter of 25 mm, an outer diameter of 52 mm, and...

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Abstract

The lubricant composition of the present invention further improves the fretting resistance by containing fatty acid metal salt, dithiocarbamate metal salt, and an additive capable of increasing the acid value of the lubricant composition.

Description

technical field [0001] The present invention relates to lubricant compositions containing specific additives, in particular lubricant compositions suitable for rolling bearings. Background technique [0002] When rolling bearings that support a support shaft such as bearings for AC servo motors, bearings for hubs, bearings for pivots of HDD (hard disk drives), etc. undergo slight reciprocating motions, or receive slight reciprocating motions, the rolling element surfaces of the bearings, Fretting wear occurs on the rolling surface, which causes various problems such as an increase in bearing torque and peeling starting from the damaged part. [0003] As a fretting wear countermeasure, for example, as described in Patent Document 1, the use of ceramic balls for rolling elements has also been carried out. However, ceramic balls are costly compared with generally used steel balls. [0004] Therefore, improvement of fretting resistance by lubricating the lubricant composition ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10M169/04C10M129/28C10M135/18C10N30/00C10N40/02C10N50/10
CPCC10N2030/06C10N2030/52C10M2207/125C10M2219/068C10M2223/04C10M2223/049C10M2205/0285C10N2020/02C10N2010/02C10N2010/04C10N2050/10C10M2217/0456C10M157/06C10M169/04C10M129/28C10M135/18C10N2040/02C10M107/02C10M115/08C10M129/40C10M137/04C10M139/00C10M141/12C10M169/06C10M2205/0206C10M2207/126C10M2215/1026C10M2290/04C10M2290/10
Inventor 丸山泰右户田雄次郎渡部绘里菅原克前田成志
Owner NSK LTD