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Double shear pin for the snow blower

  1. Apr 15, 2015 #1

    bal

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    Snow blower Stanley SS30
    Type :Dual Stage
    Maximum RPM: 3600
    Torque : 21.56 Nm
    Impeller Diameter :16" inch
    Auger Diameter:16" inch
    CC: 302
    Tire Size : 16" * 6.5
    I do not know the gear ratio : if assume its 12:1
    Gear output torque will be 258.72 Nm

    2. Relevant equations
    Assume the Shaft diameter = 44 mm=0.044m

    shear force=(pi *d^2/2)∗ shear strength of the material ( for double shear)

    shear force = (pi * 12^2/2)∗186
    shear force = 42072 N

    M = shear force * L

    M= 42072* 0.044

    M = 1851.168 Nm

    why i am getting so value for the shear pin because the maximum output torque is just 258.72 so the shear pin should break before this value isnt it?



    3. The attempt at a solution
    Assume the Shaft diameter = 44 mm=0.044m

    shear force=(pi *d^2/2)∗ shear strength of the material ( for double shear)

    shear force = (pi * 12^2/2)∗186
    shear force = 42072 N

    M = shear force * L

    M= 42072* 0.044

    M = 1851.168 Nm

    why i am getting so value for the shear pin because the maximum output torque is just 258.72 so the shear pin should break before this value isnt it?
















     
    Last edited by a moderator: Apr 19, 2015
  2. jcsd
  3. Apr 15, 2015 #2

    SteamKing

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    Staff Emeritus
    Science Advisor
    Homework Helper

    It's hard to follow these calculations. Units appear only for certain quantities, and numbers show up without reference.

    What is 186? What units does it have? What is 12?

    Can you provide some sort of sketch of this pin and what it connects to? You want to see if the pin fails, but no dimensions are provided. How whack is that? o_O
     
  4. Apr 16, 2015 #3

    bal

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    Sorry for not providing the information properly and thank you for the reply.
    shear strength of the material=186 MPa
    d=12 mm ( diameter of the pin)
    M = moment
    L = distance between two notch
    upload_2015-4-16_13-13-22.jpeg
    In the above figure,two yellow pointed arrow is where the shear pin will be installed

    I am planning to use the similar type of shear pin with two notch as shown in figure below
    shearbolt.jpg
     
  5. Apr 16, 2015 #4

    bal

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    the pin will be connect to the auger shaft of the snow blower
     
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