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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: 2003-08-06
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 example and some comparative examples.

[0040] a) Preparation of materials for sliding bearings

[0041] With the atomized iron powder of 81.2kg (trade name: Atomel 300M, produced by Kobe Steel Ltd.), the electrolytic copper powder (trade name: CE15, Fukuda Metal Foil&Power Co.Ltd. production) of 18kg, the graphite powder of 0.8kg (commodity Name: CPB, produced by Nippon Graphite Industries Ltd.) and 0.5 kg of zinc stearate powder as a molding lubricant were mixed with each other. The mixture is then compression molded to form a cylindrical compact. The resulting compact was sintered at 1,120° C. in a reducing gas. The content of bonded carbon in the iron-based sintered alloy matrix 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, then oil quenched and tempered at 180°C to obtain a material for a bearin...

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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 may be suitable for use in fields where sliding bearings are required to resist high surface pressures exerted on their sliding surfaces, examples of such sliding bearings being bearing components for 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 consists of a plain bearing part with a shaft and bearings, and a large surface pressure is exerted on the bearing part. Therefore, the bearing part adopts a bearing with high wear resistance, and the sliding surface of the bearing is coated with high-viscosity lubricating oil, grease, etc. during use. [0003] The above-described bearings generally employ bearings produced by cutting cast alloys ...

Claims

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Application Information

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