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Sintered slide bearing for construction equipment

A technology of sliding bearings and bearings, which is applied in the direction of sliding contact bearings, rotating bearings, bearings, etc., and can solve problems such as life changes and bearing capacity changes

Inactive Publication Date: 2006-03-15
HITACHI POWDERED METALS COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But its bearing capacity will change, and the life of the equipment using this kind of bearing will also change

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0039] The present invention will be described with reference to an embodiment and some comparative examples.

[0040] a) Preparation of materials for sliding bearings

[0041] 81.2 kg of atomized iron powder (trade name: Atomel 300M, manufactured by Kobe Steel Ltd.), 18 kg of electrolytic copper powder (trade name: CE15, manufactured by Fukuda Metal Foil & Power Co. Ltd.), 0.8 kg of graphite powder (trade name: CE15, manufactured by Fukuda Metal Foil & Power Co. Ltd.) Name: CPB, manufactured by Nippon Graphite Industories Ltd.) and 0.5 kg of zinc stearate powder as a molding lubricant are mixed with each other. The mixture is then compression molded to form a cylindrical compact. The resulting compact was sintered in reducing gas at 1,120°C. The content of bonded carbon in the iron-based sintered alloy base of the sintered body was 0.6% by mass. The density of the sintered body is 6.2g / cm 3 , The open porosity is 21%. The sintered body was heated to 850°C, and then oil quenched a...

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PUM

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Abstract

PROBLEM TO BE SOLVED: To stably extend the service life of a sintered sliding bearing by resolving a problem of a conventional sintered oil-containing sliding bearing having slight dispersion in durability.SOLUTION: For this sintered sliding bearing, pores each having a 10% or less area rate are exposed on the bearing inside surface of a ground surface, sealed pores each having a 20 μm or less metal thickness from the inside surface are provided, and an iron-based sintered alloy contains martensite in an iron - carbon based alloy base and is a porous iron-based sintered alloy of a hardened structure wherein copper is dispersed in it, the content of copper is 15-25 mass%, and its effective porosity is 15-28%.

Description

Technical field [0001] The present invention relates to a sintered sliding bearing, which can be applied to the fields where the sliding bearing is required to resist high surface pressure applied to its sliding surface. Examples of such sliding bearings are bearing parts used in construction equipment. Background technique [0002] A hydraulic excavator is a kind of construction equipment, and its bucket installed at the end of the rocker arm swings under the action of a hydraulic cylinder to perform excavation operations. The joint between the bucket and the rocker arm includes a sliding bearing part with a shaft and a bearing, and a large surface pressure is applied to the bearing part. Therefore, the bearing components adopt bearings with high wear resistance, and the sliding surface of the bearing is coated with high-viscosity lubricating oil, grease, etc. during use. [0003] The bearings described above are usually made by cutting cast alloys or bearings with graphite poin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16C33/12F16C33/10F16C17/02
CPCE04G17/0657E04G17/0714
Inventor 宫坂元博丸山和夫
Owner HITACHI POWDERED METALS COMPANY