Sintered bearing and method for producing sintered bearing
A technology of sintered bearings and manufacturing methods, applied in the direction of bearings, shafts and bearings, bearing components, etc., can solve problems such as hindering sintering, and achieve the effect of high mechanical strength and high corrosion resistance
Pending Publication Date: 2022-01-07
NTN CORP
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Problems solved by technology
In aluminum bronze-based sintered bearings, aluminum-copper alloy powder is mainly used as the raw material powder, but when the powder is sintered, there is the following problem: the alumina (Al 2 o 3 ) coating will significantly hinder the sintering
Method used
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Embodiment Construction
[0035] Embodiments of the present invention will be described below based on the drawings.
[0036] Such as figure 1 As shown, the sintered bearing 1 of this embodiment is formed of a cylindrical porous body having a bearing surface 1a on the inner periphery. The shaft 2 is inserted into the inner periphery of the sintered bearing 1, and when the shaft 2 is rotated in this state, the lubricating oil held in the numerous pores of the sintered bearing 1 seeps out to the bearing surface 1a as the temperature rises. This oozing lubricating oil forms an oil film in the bearing gap between the outer peripheral surface of the shaft 2 and the bearing surface 1 a, and the shaft 2 is relatively rotatably supported by the bearing 1 .
[0037] The sintered bearing 1 of the present embodiment is formed by filling a mold with raw material powder mixed with various powders, compressing and molding it into a powder compact, sintering the powder compact, and then, Formed by shaping and infil...
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Abstract
According to the present invention, a sintered bearing 1 is formed by sintering a starting material powder that contains aluminum fluoride. This sintered bearing 1 has a structure obtained by sintering an aluminum-copper alloy, and contains from 3% by mass to 13% by mass of aluminum and from 0.05% by mass to 0.6% by mass of phosphorus, with the balance being mainly made up of copper, while containing unavoidable impurities. This sintered bearing 1 is produced by performing the sintering in a closed space 23, while controlling the concentration of the aluminum fluoride gas to be 5 ppm or more if assumed that all aluminum fluoride contained in the staring material powder is gasified in the closed space 23.
Description
technical field [0001] The present invention relates to a sintered bearing and a method for manufacturing the sintered bearing. Background technique [0002] As a sintered bearing excellent in corrosion resistance, an aluminum bronze-based sintered bearing described in Patent Document 1 below is known. In aluminum bronze-based sintered bearings, aluminum-copper alloy powder is mainly used as the raw material powder, but when the powder is sintered, there is the following problem: the alumina (Al 2 o 3 ) coating will significantly hinder sintering. [0003] In order to solve this problem, in the sintered bearing described in Patent Document 1, aluminum fluoride is added to the raw material powder as a sintering aid. According to this document, aluminum fluoride slowly evaporates while melting the aluminum-copper alloy powder during sintering, and by protecting the surface of the aluminum-copper alloy powder and suppressing the formation of alumina, sintering is promoted an...
Claims
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IPC IPC(8): F16C33/10F16C33/12F16C33/14B22F3/10B22F5/10C22C9/01
CPCF16C33/121F16C33/128F16C33/145F16C33/1095F16C33/104C22C9/01B22F5/106B22F3/1007B22F2998/00F16C2204/10F16C2220/20B22F2201/40F16C17/02C22F1/08C22F1/02C22C1/0425B22F2999/00F16C2204/20F16C2202/52
Inventor 伊藤容敬浅田一
Owner NTN CORP