Grease composition for resin lubrication and electric power steering apparatus
a technology of resin lubrication and electric power steering, which is applied in the direction of liquid carbonaceous fuels, toothed gearings, portable lifting, etc., can solve the problems of shortening the fatigue life, high load on the lubricating site, and extreme use conditions
Inactive Publication Date: 2007-06-28
NSK LTD
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- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
[0113] As described above, the grease composition for resin lubrication of the present invention can keep good the sliding lubrication between a resin member and a metal member, and further between a metal member and another metal member over a long time.
[0114] Therefore, a telescopic shaft for vehicle steering or an electric power steering apparatus to which the grease composition for resin lubrication of the invention has been applied is excellent in durability, and has a long life.
Problems solved by technology
However, when this grease composition for resin lubrication is applied to an electric power steering apparatus of a large automobile, the lubrication site becomes highly loaded, and the use conditions become extreme.
This causes problems such as jamming upon slow steering due to an increase in static friction force, and shortening of the fatigue life.
Method used
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examples
[0071] Below, the invention will be further described by way of Examples and Comparative Examples. However, the invention is by no way limited thereto.
examples 1 to 19
, and Comparative Examples 1 to 4
[0072] Test greases were prepared with the formulations shown in Tables 1 to 3. Incidentally, to every test grease, a Ca sulfonate type rust inhibitor in an amount of 0.5 mass % and an amine type antioxidant in an amount of 1 mass % were added based on the total amount of the test grease. Whereas, a commercially available grease for power steering was prepared for comparison (Comparative Example 4). Then, each test grease was subjected to the following: 1) evaluation of transfer efficiency, and (2) evaluation of durability.
[0073] (1) Evaluation of Transfer Efficiency
[0074] The coefficient of friction was evaluated by means of a reciprocating kinetic friction wear test machine shown in FIG. 8. The test machine shown is configured in the following manner. A test plate 30 is fixed on a test bed 20, and a test ball 35 is allowed to reciprocate horizontally with the test plate 30 by a cam 50 with a vertical load applied thereon. Thus, the coefficient of...
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Abstract
An object of the present invention is to provide a grease composition for resin lubrication which is capable of keeping good the sliding lubrication between a resin member and a metal member, and between a metal member and another metal member over the long term. The present invention provides a grease composition for resin composition which is characterized by including a base, a thickener, and at least one of a nonpolar wax and a polar wax. Further, the grease composition for resin lubrication is applied to a telescopic shaft for vehicle steering or an electric power steering apparatus, thereby to improve the durability, and to achieve a longer life.
Description
TECHNICAL FIELD [0001] The present invention relates to a grease composition for resin lubrication, to be preferably used for the lubrication between a resin member and a metal member, as in a power steering apparatus of an automobile, a resin-coated spline, or the like. BACKGROUND ART [0002] In recent years, members made of resins (such as polyamide) have come to be often used in place of various members made of metals for the purpose of reducing the weight of an automobile or the like. For example, for the speed reduction mechanism unit of the electric power steering apparatus of an automobile, a worm wheel gear made of a resin and a worm gear made of a steel are used. For the lubrication between the members made of a resin, and between the member made of a resin and the member made of metal, generally, a grease composition is used. For example, a grease composition for resin lubrication, containing a fatty acid containing a hydroxyl group or a fatty acid ester of polyhydric alcoh...
Claims
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Patent Timeline
Login to View More IPC IPC(8): C10M159/06C10M115/08B62D1/16B62D5/04C10M101/02C10M105/04C10M105/18C10M105/32C10M107/02C10M117/02C10M117/06C10M135/10C10M143/00C10M169/00C10M169/02C10M169/06C10N10/04C10N20/02C10N30/06C10N40/04C10N50/10F16D3/06F16H55/06F16H57/02F16H57/04
CPCC10M159/06C10M169/06C10M2203/003C10M2203/1006C10M2205/00C10M2205/0206C10M2205/0285C10M2205/14C10M2205/16C10M2205/18C10M2207/0406C10M2207/106C10M2207/1245C10M2207/2805C10M2215/1026C10M2219/044C10M2219/046C10N2210/01C10N2220/022C10N2230/06C10N2240/00C10N2240/046C10N2250/10F16H1/16C10N2210/02C10N2010/02C10N2020/02C10N2030/06C10N2040/00C10N2050/10C10N2040/046C10N2010/04
Inventor MIYAJIMA, HIROTOSHINAKATANI, SHINYAIWANO, TOSHIYUKINAKA, MICHIHARU
Owner NSK LTD