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Sintered oil retaining bearing and fabrication method thereof
| Details |
Inventors: Sugimoto, Mamoru; Okuda, Toru; Ikenoue, Akihiro; Tanaka, Takeshi;
Assignee: Sumitomo Electric Industries, Ltd. (Osaka, JP); ASMO Co., Ltd. (Kosai, JP)
Primary Examiner: Footland; Lenard A.
Assistant Examiner:
Attorney, Agent or Firm: Fasse; W. F., Fasse; W. G.
A sintered oil retaining bearing has a bearing bore through which a rotary shaft is inserted formed at a bearing main unit made of a porous sintered alloy. The inner circumferential wall serving as the bearing bore includes a center inner circumferential wall located at the center region of the inner circumferential wall, and one end side inner circumferential wall and other end side inner circumferential wall, located at one end side and the other end side, respectively, of the center inner circumferential wall in the direction of the rotary shaft. The center inner circumferential wall has a blinded portion where the air permeability is not more than 0.3.times.10.sup.-3 darcy, and air permeability lower than that of the one end side and other end side inner circumferential wall. |
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DETAILED DESCRIPTION An object of the present invention is to provide a sintered oil retaining bearing that can have suction of the lubricant at the closing pore portion prevented and that can have sufficient lubricant supplied at the closing pore portion, and a fabrication method thereof.
According to a sintered oil retaining bearing of the present invention, a bearing bore through which a rotary shaft is to be inserted is formed in a bearing main unit made of a porous sintered alloy.
The inner circumferential wall plane which becomes the bearing bore includes a closing pore portion where air permeability is not more than 0.
3.
times.
10.
sup.
-3 darcy.
Since the air permeability is as low as not more than 0.
3.
times.
10.
sup.
-3 darcy in the sintered oil retaining bearing of the present invention, suction of the lubricant into the open pore at the closing pore portion can be suppressed even if rotation is ceased under a very low temperature environment.
Since there is sufficient lubricant at the sliding surface between the rotary shaft and the bearing main unit when rotation starts, the problem of local contact between the rotary shaft and the bearing main unit to cause noise can be prevented.
In the above sintered oil retaining bearing, the air permeability of the closing pore portion is preferably not more than 0.
1.
times.
10.
sup.
-3 darcy.
Accordingly, suction of lubricant into the open pore at the closing pore portion can be further suppressed.
In the above sintered oil retaining bearing, the inner circumferential wall that becomes the bearing bore preferably includes a center inner circumferential wall located at the center portion of the inner circumferential wall, one end side inner circumferential wall and other end side inner circumferential wall located at one end side and the other end side, respectively, of the center inner circumferential wall in the direction of the rotary shaft.
The center inner circumferential wall corresponds to the closing pore portion, and has an air permeability smaller than that of the one end side inner circumferential wall and the other end side inner circumferential wall
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