Ntn Corporation

Yousuke Sugai

Yoshinori Ito

Toshihiko Mouri

Fuminori Satoji

Noriyoshi Yoshizuka

There is provided a sintered bearing having high rotational accuracy and low rotational fluctuation. This bearing includes a bearing surface (), and is made of a sintered compact (&#x2033;) produced by molding and sintering a raw material powder () containing a partially diffusion-alloyed powder () in which a copper powder () is partially diffused on a surface of an iron powder (), a tin powder () as a low-melting-point metal powder, and a graphite powder as a solid lubricant powder. The sintered bearing has a radial crushing strength greater than or equal to 300 MPa.

Sintered bearing

A sliding member () is formed of a sintered compact. The sintered compact includes: a base layer (), which mainly contains an Fe-based structure and further contains 1.0 wt % to 5.0 wt % of Cu, a metal having a melting point lower than a melting point of Cu, and C; and a sliding layer (), which is sintered together with the base layer () in a state of being held in contact with the base layer () and has a sliding surface (A). The sliding layer () mainly contains an Fe-based structure containing at least one kind of alloy element selected from Ni, Mo, Mn, and Cr and further contains Cu and C, and the content of Cu in the sliding layer () is larger than the content of Cu in the base layer.

Slide member and method for manufacturing same

The present invention relates to a method for manufacturing a sintered bearing having a bearing surface that forms a bearing gap with a shaft to be supported, in its inner periphery. This manufacturing method includes: a compacting step Pof compacting a base powder containing a diffusion alloyed powderprepared by partially diffusing a copper powder in an iron powder as a main material, a low-melting-point metal powder, and a solid lubricant to obtain a green compact, and a sintering step Pof sintering the green compact' to obtain a sintered compact

Method for manufacturing sintered bearing, sintered bearing, and vibration motor equipped with same

Provided is a sintered bearing () including an inner layer () and an outer layer () formed by integral molding, the sintered bearing () having a bearing surface (A) formed on an inner peripheral surface () of an inner layer (). The inner layer () is made of sintered metal containing Fe and a hardness increasing element (such as Ni or Mo). The outer layer () is made of sintered metal containing Fe and no hardness increasing element. A concentration gradient of the hardness increasing element is present at an interface between the inner layer () and the outer layer ().

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Aichi, Japan

Yousuke Sugai