Frictional resistance offered by ring in flat pivot bearing - Theory of Machines - 1

Q.  The frictional resistance (Tr) offered by the ring in flat pivot bearing is given as
- Published on 06 Aug 15

a. 2 π μ p r δr
b. 2 π μ p r2 δr
c. 2/3 π μ p r δr
d. 2/3 π μ p r2 δr

ANSWER: 2 π μ p r δr

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    Discussion

  • Sravanthi   -Posted on 19 Oct 15
    Pivot bearings depending upon shape of end shaft and bearing surfaces are shown below:

    1) Flat pivot bearings
    2) Flat collar pivot bearing
    3) Conical pivot bearing
    4) Truncated conical bearing

    Flat pivot bearing:

    If an elemental ring is considered on bearing surface,

    a) Area of ring is given as 2 π r δr
    b) Load acting on ring is given as p x 2 π r δr

    Frictional resistance offered by the ring is Fr = μ δW

    = 2 π μ p r δr

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