Sliding bearing

Details Sliding bearing Sliding bearing

1996-02-26

1998-01-06

Footland, Lenard A.

Bearings

Bearing-surface treatment

F16C 1700

Patent

active

057047200

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The invention relates to a sliding bearing, and more particularly, to a sliding bearing in which annular peaks are formed on a surface which is disposed in sliding contact with a rotating shaft.


BACKGROUND

Customarily, a slight clearance is provided between the surfaces of a sliding bearing and a rotating shaft which are disposed in sliding contact with each other when the rotating shaft is rotatably journalled by the sliding bearing. In such a conventional sliding bearing, when a smaller internal diameter of the surface of the sliding bearing which is disposed for sliding contact is chosen in an attempt to minimize the magnitude of the clearance, there results the disadvantage that a frictional resistance between the surfaces of the sliding bearing and the rotating shaft which are disposed in sliding contact with each other increases. Conversely, when a larger inner diameter is chosen for the sliding surface of the sliding bearing to increase the clearance and minimize the frictional resistance, there is another disadvantage that the occurrence of an impact sound between the surfaces increases. Thus, it has been difficult in a conventional sliding bearing to achieve a reduction in the frictional resistance between the sliding surfaces and a reduction in the impact sound simultaneously.


DISCLOSURE OF THE INVENTION

In view of the foregoing, the invention provides a sliding bearing including a plurality of axially spaced, annular continuous or discontinuous peaks which extend circumferentially on a surface of the sliding bearing which is disposed for sliding contact with a rotating shaft in which, as viewed in an axial section, the various portions are defined on the basis of an imaginary reference line intersecting with individual peak regions and being parallel to the axis and is determined such that the total cross-sectional area of peak regions located above the reference line is equal to the total cross-sectional area of valley-shaped recess regions located below the reference line, the top of the peak having a height .DELTA.C above the imaginary reference line and a height as measured from the bottom of the valley-shaped recess to the top of the peak being denoted by h, the parameter .DELTA.C being taken on an ordinate and the parameter h being taken on the abscissa in a graphical representation, the parameters .DELTA.C and h being located within a range defined by four rectilinear lines given by the following mathematical equations:
With the sliding bearing thus constructed, a lubricant oil is stored in the space of an annular groove formed between a pair of axially adjacent peaks or in the valley-shaped recess, whereby the amount of lubricant oil which is maintained between the sliding surfaces can be increased. If the internal diameter of the sliding surface of the sliding bearing is small so as to reduce the clearance between the sliding surface of the rotating shaft and the sliding surface of the sliding bearing, the actual clearance between the rotating shaft and the sliding bearing is large as compared with the conventional sliding bearing, whereby the frictional resistance experienced between the sliding surfaces can be minimized.
As to the occurrence of an impact sound, the peaks on the sliding surface of the bearing and the clearance are effective in reducing the occurrence of an impact sound and, at the same time, the frictional resistance is reduced. In this manner, a reduction in the sliding resistance and a reduction in the occurrence of an impact sound are simultaneously achieved .


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an axial cross section of an essential part of a sliding bearing 1 according to one embodiment of the invention in an exaggerated form;
FIG. 2 graphically shows a multitude of rectilinear lines, which illustrate differences in the size of essential parts between a sliding bearing according to the invention and a conventional sliding bearing;
FIG. 3 is the graphical representation of a result of measuring the impact sound in sliding bearings

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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