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US 5,704,720 AGranted
Sliding bearing
AssigneeTaiho Kogyo Co., Ltd.
InventorsYoshio Kumada, Katsuyuki Hashizume, Soji Kamiya
Life of this patent
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AssigneeTaiho Kogyo Co., Ltd.
InventorsYoshio Kumada, Katsuyuki Hashizume, Soji Kamiya
Estimating the term…
A helical groove 1B is formed in the sliding surface 1A of a sliding bearing 1 over the entire axial region thereof. To establish the height of a peak 1a defined by the helical groove 1B, an imaginary reference line L extending parallel to the axis is formed which is determined such that the total cross-sectional area of all the peaks 1a is equal to the total cross-sectional area of all the valleys 1b when the helical groove 1B is considered in axial section. A height, as measured from the reference line L to the top 1a' of the peak 1a is chosen in the range of from 1 to 8 .mu.m. The space created by forming the valleys 1b allows the supply of lubricant oil to be increased, thereby simultaneously achieving a reduction in the frictional resistance and the occurrence of an impact sound.
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 comes into sliding contact with a rotating shaft in which, as viewed in an axial cross-section, the various portions are defined on the basis of an imaginary reference line which intersects with individual peak regions, extends 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, 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 an area defined by four rectilinear lines given by the following mathematical equations:
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 comes into sliding contact with a rotating shaft in which, as viewed in an axial cross-section, the various portions are defined on the basis of an imaginary reference line which intersects with individual peak regions, extends 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, 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 an area defined by four rectilinear lines given by the following mathematical equations:
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 comes into sliding contact with a rotating shaft in which, as viewed in an axial cross-section, the various portions are defined on the basis of an imaginary reference line which intersects with individual peak regions, extends 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, 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 an area defined by three rectilinear lines given by the following mathematical equations:
Dependencies are inferred from the claim text.