Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Sintered bearing and manufacturing method for same

Inactive Publication Date: 2015-03-05
NTN CORP
View PDF2 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is about a sintered bearing that has improved resistance to corrosion, strength, abrasion, and has good oil film formation and holding properties. The manufacturing method is efficient and cost-effective, making it suitable for mass production.

Problems solved by technology

Gasoline, light oil, and the like of a variety of quality have been used in regions of the world, and gasoline of inferior quality has been used in many regions.
In the case of using a copper-based sintered bearing in a motor-type fuel pump, the copper-based sintered bearing is corroded with the organic acid contained in such gasoline of inferior quality.
This degrades the strength of the bearing, with the result that the life of the copper-based sintered bearing becomes short.
Therefore, although a related-art copper-based sintered bearing has high strength, the abrasion resistance thereof is not sufficient.
This sintered bearing has a problem in that aluminum oxide covering the surface of aluminum-containing copper alloy powder to be generated during sintering inhibits sintering, and hence a sintered compact having sufficient strength cannot be obtained easily.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Sintered bearing and manufacturing method for same
  • Sintered bearing and manufacturing method for same
  • Sintered bearing and manufacturing method for same

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0048]As illustrated in FIG. 1, a sintered bearing 1 as the sintered bearing is formed in a cylindrical shape having a bearing surface 1a on an inner circumference. When a shaft 2 is inserted with respect to the inner circumference of the sintered bearing 1, and the shaft 2 is rotated in this state, lubricating oil held in an indefinite number of pores of the sintered bearing 1 seeps out from the bearing surface 1a along with an increase in temperature. The lubricating oil that has seeped out forms an oil film between a bearing gap between the outer circumferential surface of the shaft 2 and the bearing surface 1a, and the shaft 2 is supported by the bearing 1 so as to be rotatable relatively.

[0049]The sintered bearing 1 according to the first embodiment is formed by filling a form with raw material powder obtained by mixing various powders, compressing the raw material powder to form a green compact, and then sintering the green compact.

[0050]The raw material powder is mixed powde...

second embodiment

[0096]In the second embodiment, copper powder, aluminum-copper alloy powder, and phosphorus alloy powder are mixed at such a ratio that the content of aluminum is from 7 to 12% by mass, the content of phosphorus is from 0.05 to 0.5% by mass, and the balance comprises copper as a main component, and a total of 0.05 to 0.2% by mass of aluminum fluoride and calcium fluoride serving as the sintering aid and 1 to 5% by mass of graphite are mixed with a total of 100% by mass of the above-mentioned mixture to obtain raw material powder.

[0097][Aluminum Fluoride and Calcium Fluoride]

[0098]An aluminum oxide film to be generated on a surface of aluminum-containing copper-based alloy powder during sintering inhibits the sintering remarkably. However, aluminum fluoride and calcium fluoride serving as the sintering aid evaporate gradually while being melted at a sintering temperature of from 850 to 900° C. of the aluminum-containing copper-based alloy powder and protect the surface of the aluminu...

third embodiment

[0112]FIG. 9 illustrates an example of a fuel pump for an automobile engine mounted with the sintered bearing incorporated therein. In a fuel pump 40, the sintered bearing 1 is provided on the rotation side. Specifically, the fuel pump 40 includes a casing 41 having a liquid inlet 41a and a liquid outlet 41b, a fixed shaft 2 fixed to the casing 41 and protruding to an internal space of the casing 41, an impeller 42 provided rotatably with respect to the fixed shaft 2, a motor 43, a magnet 44 mounted on the impeller 42, and a magnet 45 mounted on a rotation shaft of the motor 43 and opposing in a radial direction to the magnet 44 on the impeller 42 side. The sintered bearing 1 is fixed to an inner circumferential surface of the impeller 42, and an inner circumferential surface (bearing surface 1a, see FIG. 1) of the sintered bearing 1 and an outer circumferential surface of the fixed shaft 2 are fitted to each other slidably in a rotation direction. When the motor 43 is driven to ro...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Temperatureaaaaaaaaaa
Percent by massaaaaaaaaaa
Percent by massaaaaaaaaaa
Login to View More

Abstract

Provided is a sintered bearing (1), including 3 to 12% by mass of aluminum, 0.05 to 0.5% by mass of phosphorus, and the balance including copper as a main component, and inevitable impurities, the sintered bearing (1) having a structure in which an aluminum-copper alloy is sintered with a sintering aid added to raw material powder, a pore (db, do) in a surface layer portion of the sintered bearing (1) being formed smaller than an internal pore (di).

Description

TECHNICAL FIELD[0001]The present invention relates to a sintered bearing that is excellent in corrosion resistance and abrasion resistance and has high strength, and to a manufacturing method for the sintered bearing.BACKGROUND ART[0002]Hitherto, for example, in an engine using gasoline or light oil as fuel, a motor-type fuel pump has been used. In recent years, engines including a motor-type fuel pump using fuel such as gasoline or light oil have been widely used in various parts of the world. Gasoline, light oil, and the like of a variety of quality have been used in regions of the world, and gasoline of inferior quality has been used in many regions. As one kind of gasoline of inferior quality, gasoline containing an organic acid is known. In the case of using a copper-based sintered bearing in a motor-type fuel pump, the copper-based sintered bearing is corroded with the organic acid contained in such gasoline of inferior quality. This corrosion occurs on the periphery of an ope...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): B22F5/00F16C33/10B22F1/00B22F3/12B22F3/24B22F1/105
CPCB22F5/00B22F3/12B22F3/24B22F1/007B22F2302/40B22F2201/01B22F2301/10B22F2302/45F16C33/104B22F3/02B22F3/1003B22F3/11B22F5/10B22F5/106C22C1/08C22C1/10C22C9/01F16C2204/10F16C33/128C22C9/10F16C33/145F16C2204/20B22F1/105
Inventor JINNOU, MAKOTOMORI, NATSUHIKOITO, YOSHINORI
Owner NTN CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com