To select the type of reduction gear the following instruction concerning the applications should be known.
 
 
 
Winch Drive
 

GUIDELINES TO SELECT GEAR UNIT
 
To select the type of reduction gear the following instruction concerning the applications should be known.
  • Torque to be transmitted (Output Torque)
  • Input speed (RPM)
  • Output speed (RPM)
  • Operating Condition (i.e. No of Start-ups per hour and it subject to impacts
  • Ambient Temperature (°C)
  • Radial Loads on Output Shaft
  • Radial Loans on Input Shaft
  • Thrust Load if any
After knowing the above information following steps to be followed for the selection
Step 1
 Select the Reduction Ratio
i = 
Input Speed
Output Speed
Step 2
 Output torque to be transmitted.If the output torque is not known then the torque can be worked as:
i = 
P × 9546
N
Where P is power in Kw

If the power available is in HP,convert to Kw using relation.
1Hp=0.746 Kw     

This above torque either defined output torque or calculated output torque or average output torque to be multiplied by the service Factor shown in the service factor table.
Step 3
 Verification Of Thermal Capacity
After selection of model it is necessary to check with thermal capacity of the reducer Thermal Rating (Kw) Pt It is the power a reduction gear can transmit in the continuous use at maximum operating temperature of 900C When ambient temperature is 250C, Oil viscosity is ISO 320 and input speed is 1400 RPM. The thermal ratings are shown in selection chart.
Setp 4
The selected Reducer is required in Hollow input configuration then it has to be verified for available frame size. Available frame sizes are shown in selection chart.
Step 5 Check for overhang Load
When reducer is connected with sprocket, pulley, timing belt, gear or friction wheel there is radial load generated on shaft either high speed or low speed & this has to be checked called as overhang load capacity. Calculate the overhang load as per below mentioned formula.
Overhang Load in N =
19100000 × P
D × n
 × Fc
Where P is power in Kw (1HP= 0.736Kw)
  d is diameter of Sprocket/ Pulley/Gear/Friction Wheel in mm
  n is speed of shaft in RPM
  Fc is load connection factor. Which is as under
Chain Sprocket Gear Sprocket V-Belt Friction Wheel
1 1.06 1.5 2.5 3.5
Now refer the table showing the overhang load capacity for low speed & high-speed shafts. Compare the calculated overhang load for selected model at desired life. The value shown in table for the life n2h=105 cycles. Now multiple the value by life factor to get desired overhang load at desired life.
Compare the calculated overhang load with actual as per the load location the distance from shaft coller if value is within limit then the selection is correct or else check the possibility of increasing the PCD of wheel & reducing the distance from coller or select next higher model.