Double shear pin for the snow blower

In summary: 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?
  • #1
bal
3
0
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

Homework 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 isn't it?

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 isn't it?

 
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  • #2
bal said:
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

Homework 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 isn't it?
[/B]

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 isn't it?
[/B]

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
 
  • #3
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
 
  • #4
the pin will be connect to the auger shaft of the snow blower
 

1. What is a double shear pin for a snow blower?

A double shear pin for a snow blower is a mechanical safety device that is designed to break under excessive stress, preventing damage to the snow blower's engine and other components. It is typically used in snow blowers to connect the auger or impeller to the engine shaft.

2. Why is a double shear pin necessary for a snow blower?

A double shear pin is necessary for a snow blower because it helps protect the engine and other components from damage. If the snow blower hits a hard object, such as a rock or ice, the shear pin will break instead of causing more serious damage to the machine.

3. How do you know when a double shear pin needs to be replaced?

You should inspect the shear pins before each use of the snow blower. If the pin is broken or missing, it needs to be replaced. You may also notice decreased performance or unusual noises from the snow blower if the shear pin needs to be replaced.

4. Can the double shear pin be replaced by any other type of fastener?

No, it is important to use the specific double shear pin designed for your snow blower. Other types of fasteners may not provide the same level of protection and could potentially cause damage to the snow blower.

5. How often should a double shear pin be replaced?

The frequency of replacing a double shear pin will depend on how often you use your snow blower and the conditions in which it is used. It is recommended to replace the shear pin at least once per season or after any incident where it breaks. It is always better to be safe and replace it more frequently if needed.

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