Technical

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Wet Friction Application Data Sheet

Customer Information
Company:
Address:
Engineering Contact:
Title:
E-mail Address:
Phone Number:
Fax Number:
Wellman Contact:
Application Data
Equipment Type:
Function:
Number of Discs/Pack:
Number of Active Surfaces:
Part Number (Furnish dwg.):
Annual Estimated Volume:
Major Dimensions (OD, ID friction, thickness, etc.):
Operating Data
Torque Capacity:
Apply Force or Unit Pressure:
Relative Speed of Rubbing Surfaces at Engagement:	(RPM @vel.)
Engagement Time (sec):
Energy Absorbed (BTU):
Max. Horsepower
Total Kinetic Energy/Eng.
Inertia:
Time Between Eng.
If braking application:
Vehicle Gross Wt.:
Distribution:	%F %R
Number of Braked Axles:
Tire Rolling Radius:
Max. Vehicle Speed:
Required Deceleration:
Reaction Plate Data
Material:
Thickness:
Surface Finish:
Cooling Information (if wet application):
Fluid Type:
Flow Rate:
Sump Volume:
Sump Temperature:
Additional Data:
Files to Submit with Application:	If you have multiple files to submit, please compress them into one .zip file and upload that file here.
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Interpretation of data requested:

Vehicle Mass: We need the fully loaded weight of the vehicle in Kilograms to calculate the energy that the brake must dissipate.

Rolling Radius: The wheel radius measured from the center of the axle to the pavement when the vehicle is loaded.

Weight Distribution Under Braking: The % of weight on the front and rear wheels taking into account the static split between the front and rear wheel load and the bias induced by the braking action. If the distribution during braking is not available then list the static (zero speed) weight distribution and label it as the static distribution.

Number of Pistons: (very important) Some calipers only have one piston on one side of the caliper and the whole caliper slides to center the pads on the rotor. Other calipers are fixed in place and have opposing pistons on either side of the rotor. Racing calipers may have up to 3 or 4 pistons on either side of the rotor and in addition pistons may be different sizes.

Available Hydraulic Pressure: Combined with the piston number and diameter to determine the maximum compressive/clamping force that is available.

Piston Diameter: Necessary to calculate how much compressive force is available to apply the brake pads to the rotor.

Outside and Inside Swept Radius: Will define the effective radius of the brake rotor. We need this to calculate the torque.

Rotor Thickness: A defining property of the available heat sink.

Rotor Material: Contributes to the available heat sink, but also will determine what pad materials may be used.

Number of Pads per Caliper: Important because there are some racing calipers (usually in automobiles) with 4 or even 6 pads in a caliper.

Area of the Pads: Determines the intensity of the energy flow. This is especially useful if we do not have sample rotors or calipers to test. By knowing the pad areas we can check other tests to find the closest match to simulate the test.

Description of Use: Will inform us as to what procedure to use in a simulation. We can chose among procedures ranging from a heavy duty mine loading cycle to an on-road relatively high speed stop or retarding while going down a hill.

*Most modern wheel loaders have the same wheel size front and rear so there is some duplication in the application sheet at this point. There are many loader backhoes in North America and Europe with smaller wheels in the front used for steering. The main brakes and perhaps only brakes are in the rear with the backhoe attachment.