Sliding bearing

Details Sliding bearing Sliding bearing

1995-11-13

1997-04-15

Hannon, Thomas R.

Bearings

Rotary bearing

Plain bearing

384276, F16C 3324

Patent

active

056202628

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The invention relates to a sliding bearing, and more particularly, to a sliding bearing including a bearing alloy layer, an intermediate layer and an overlay layer.


BACKGROUND

A sliding bearing is known in the art including a bearing alloy layer having a number of circumferentially extending annular grooves, which are axially spaced apart, formed in its inner peripheral surface, with a circumferentially extending peak defined between a pair of axially adjacent annular grooves, an intermediate layer which coats the surface of the bearing alloy layer, and an overlay layer which coats the surface of the intermediate layer, the arrangement being such that when the overlay layer and the intermediate layer are partly abraded beginning from the surface of the overlay layer, the overlay layer and the intermediate layer which remain within recesses of the annular grooves as well as the peaks of the bearing alloy layer become exposed (See Japanese Laid-Open Patent Application No. 205,014/1985).
With a sliding bearing thus constructed, when the overlay layer and the intermediate layer are partly abraded beginning from the surface of the overlay layer, the overlay layer and the intermediate layer which remain within the recesses of the annular grooves as well as the peaks of the bearing alloy layer become exposed, thus preventing the intermediate layer from being extensively and immediately exposed as occurring in a sliding bearing of the same kind, but which is not provided with annular grooves. In this manner, a drastic reduction in the seizure resistance which may be caused by an extensive exposure of the intermediate layer can be effectively prevented.
However, according to the cited Application, it is described that the depth of the annular groove or the height of the peak be equal to or greater than one and one-half times the thickness of the intermediate layer and be equal to or greater than 5 .mu.m in order to achieve the intended effect.


DISCLOSURE OF THE INVENTION

However, as the results of various tests conducted while changing the thickness of the overlay layer and the diameter of a rotating shaft which is journaled by the sliding bearing, in addition to considering the relationship between the peak height and the thickness of the intermediate layer, it is found that an initial seizure resistance which is excellent over the prior art as well as excellent results in respects of the seizure resistance obtained upon abrasion of the overlay layer and the wear resistance are obtained under given conditions.
Accordingly, the invention provides a sliding bearing which exhibits an excellent performance in respects of the initial seizure resistance, the seizure resistance upon abrasion of the overlay layer as well as the wear resistance.
Specifically, the invention relates to a sliding bearing including a bearing alloy layer having a number of circumferentially extending annular grooves, spaced apart in the axial direction, formed in its inner peripheral surface, with a circumferentially extending peak defined between each pair of axially adjacent annular grooves, an overlay layer which coats the surface of the bearing alloy layer, and an overlay layer which coats the surface of the intermediate layer, the arrangement being such that when the overlay layer and the intermediate layer are partly abraded beginning from the surface of the overlay layer, the overlay layer and the intermediate layer which remain in recesses of the annular grooves as well as the peaks of the bearing alloy layer become exposed.
A sliding bearing provided in accordance with the invention is characterized in that denoting the peak height by h, the thickness of the intermediate layer by y and the thickness of the overlay layer at the top of the peak by t, these parameters satisfy the following requirements defined by inequalities:
More preferably, these parameters satisfy the following requirements, which are effective in providing a further enhanced bearing performance:
Additionally, denoting the diameter of a rotating

REFERENCES:
patent: 4400099 (1983-08-01), Ehrentraut
patent: 4538929 (1985-09-01), Ehrentraut et al.
patent: 4561787 (1985-12-01), Ehrentraut et al.
patent: 4606653 (1986-08-01), Ehrentraut et al.
patent: 5071263 (1991-12-01), Kamiya et al.
patent: 5116144 (1992-05-01), Kamiya et al.
patent: 5238311 (1993-08-01), Katou et al.

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