Oil-impregnated sintered bearing
AssigneeAsmo Co., Ltd.
InventorsTakeshi Tanaka, Kenji Nishio, Tooru Ito
Life of this patent
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Abstract
An oil-impregnated sintered bearing is comprised of a cylindrical porous bearing body and a non-porous resinous slide member. The bearing body has a first portion providing a part of the slide surface of the bearing and a second portion having an inner periphery. The non-porous resinous slide member is disposed at the inner periphery of the second portion providing the other part of the slide surface. The slide member has a radial thickness that corresponds to a suitable ratio of the radial thickness of the bearing.
Claims20
A cylindrical oil-impregnated sintered bearing having a radial thickness T2 and an inner slide surface, said bearing comprising:
- a cylindrical porous bearing body made of sintered metal powder, said bearing body having a first portion providing a part of said slide surface and a second portion having an inner periphery, said first portion having the same radial thickness as said bearing;
- and
- a non-porous slide member having a thickness T1 disposed at said inner periphery of said second portion for providing the other part of said slide surface, said slide member being made of a resinous material whose clearance changes under a constant temperature change along a non-linear curve having an inflection point that is a function of a ratio T1/T2 of said radial thickness T1 of said slide member to said radial thickness T2 of said bearing changes, wherein
- said thickness T1 of said slide member is smaller than a thickness that corresponds to a ratio T1/T2 of said inflection point.
An oil-impregnated sintered bearing for supporting a shaft at a clearance from an inner cylindrical slide surface, said bearing comprising:
- a cylindrical porous bearing body having a first portion providing a part of said slide surface and a second portion having an inner periphery, said first portion having the same radial thickness as said bearing;
- and
- a non-porous resinous slide member made of a resinous material disposed at said inner periphery of said second portion providing the other part of said slide surface, wherein
- a ratio of the radial thickness of said slide member to the radial thickness of said bearing is smaller than a ratio that corresponds to an inflection point of a clearance-change-rate characteristic curve that is a function of said ratio.
Dependencies are inferred from the claim text.