Bearings – Rotary bearing – Plain bearing
Patent
1998-06-15
2000-09-19
Footland, Lenard A.
Bearings
Rotary bearing
Plain bearing
384293, 384902, F16C 1702
Patent
active
06120188&
ABSTRACT:
An inexpensive bearing unit having a high rotational accuracy and a high reliability is provided for use in information and video-acoustic equipments. In the case of an oil-impregnated sintered bearing (1) in which an inner surface (2) sliding together with a shaft is formed on the bearing body (1) made of a porous sintered alloy, a plurality of concavities (4) are transferred to a tapered portion of the bearing inner surface (2) by forming a part or the whole of the inner surface (2) into a tapered shape or a tapered-like shape at the time of molding a green compact of the sintered alloy and press-fitting a pin (5) formed with protrusions (6) in the subsequent process and moreover, concavities (7) in which the shaft sliding surface is closed are formed by sizing the tapered portion straight at the time of sizing. Because the concavities (7) making a superior dynamic-pressure effect can be formed in a simple process, it is possible to provide an inexpensive bearing unit having a high rotational accuracy.
REFERENCES:
patent: 5120091 (1992-06-01), Nakagawa
patent: 5120140 (1992-06-01), Nakagawa et al.
patent: 5282688 (1994-02-01), Kanezaki et al.
Fujinaka Hiroyasu
Otsuka Shigeru
Footland Lenard A.
Matsushita Electric Industiral Co., Ltd.
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