Ntn Corporation

Takahiro Gotou

Yoshinori Ito

Fuminori Satoji

Hisanori Aiga

Hiroki Manabe

Naoaki Tsuji

Hiroharu Nagata

Tomoyuki Seto

Provided is a sintered bearing for an EGR valve, including raw material powder including 9% by weight to 12% by weight of aluminum, 0.1% by weight to 0.6% by weight of phosphorus, 3% by weight to 10% by weight of graphite, and the balance including copper as a main component, and inevitable impurities. The sintered bearing has a structure of a sintered aluminum-copper alloy. The sintered bearing further includes free graphite distributed in pores formed so as to be dispersed.

Sintered bearing for an EGR valve and manufacturing method thereof

A solid lubricantis formed by molding and firing powder that includes amorphous and self-sintering carbon material powdergraphite powderand a binderThe solid lubricant has high material strength and hardness, and also excellent impact resistance and wear resistance.

Solid lubricant and solid-lubrication rolling bearing

Raw material powder containing metal powder as a main component is molded to form a metal powder molded body ('), and the metal powder molded body (&#x2032;) is sintered to form a metal substrate (). Further, a lubricating member () is made of an aggregate of graphite particles (), and at least a part of a bearing surface () is formed of the fabricating member (). The lubricating member () is fitted into the metal powder molded body (&#x2032;). After that, the metal powder molded body (&#x2032;) is sintered, and at this time, the lubricating member () is fixed onto the metal substrate () with a contraction force (F) generated in the metal powder molded body (&#x2032;).

Slide member and method for producing same

Provided is a sintered bearing () obtained by molding raw material powders containing graphite powder and metal powder in a mold, followed by sintering, in which: the graphite powder to be used includes granulated graphite powder; and a ratio of free graphite in a bearing surface () of the sintered bearing is set to from 25% to 80% in terms of an area ratio. An average grain size of the granulated graphite powder is set to from 60 &#x3bc;m to 500 &#x3bc;m. A blending ratio of the granulated graphite powder in the raw material powders is set to from 3 wt % to 15 wt %.

Sintered bearing

A separatorincluding a solid lubricant is disposed between adjacent rolling elements. Relative movement of the adjacent rolling elementsand the separatorin a direction of separating apart in a circumferential direction is restricted by restricting members, and the restricting membersare disposed at plural locations in the circumferential direction. A minute gap &#x3b1; is provided between the adjacent restricting members, to allow relative movement therebetween. This can provide a solid-lubrication rolling bearing capable of stably preventing rotational locking and unintended disassembling of the bearing for a long period.

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Aichi, Japan

Takahiro Gotou