Tolomatic, Inc. - Power Transmission Disc Cone Clutches

Disc Cone Clutch Selection

1. Compile Application Requirements
To determine the appropriate Tolomatic clutch for an application compile the following information:

Available operating pressure
Input power shaft size
Starting time (seconds) required
Weight(lbs.) and radii(ft.) of the rotating members
Speed (RPM)
Rotation reductions in multi-shaft systems
Cycle Rate/Hr.

2. Calculating Torque

The radius of gyration is the distance from the center of rotation at which the entire rotating mass could be concentrated and still be equivalent to the actual distributed mass (see diagrams below).
For multiple shaft systems, use the following formula:

3. Calculate the Heat Dissipation Required
When a clutch is engaged, some degree of slippage occurs which generates heat. The clutch must be properly sized so that it can not only transmit the torque required, but also dissipate the heat generated and maintain a clutch temperature within acceptable operating limits for the friction material (300^oF). Calculate heat generated (which must then be dissipated) using the formula:

To determine thermal horsepower, use:

4. Select the Clutch Size and Model
Begin the selection once the torque and energy calculations have been completed. Consult the Torque vs. Pressure charts either on the selection graphs page or on the individual model performance data page.
Cross reference torque required and the available operating pressure. If the intersection falls below the diagonal line the clutch will accommodate the torque required for the application. Click image on right to go to the Selection Graph page.
Next, consult the Heat Dissipation chart for the same clutch (located on the individual model performance data pages).
Cross reference the BTU/hr. and the RPM at which the application will run. If the intersection is above the line, a clutch with higher heat dissipation should be considered. Now, simply select the bore size that fits your application.

DCC: Disc Cone Clutches Perform Data Select Graph

5. Select Options
A clutch must have a means to transmit power. This may be done with either sheaves or sprockets.

Sprockets
Tolomatic offers several varieties of sprockets for Disc Cone clutches. Like sheave mounts, these sprockets are factory mounted to the pilot and the pilots have bolt holes that can easily handle other sizes of sprockets.

6. Consider Optional Clutch/Brake
Some applications may require controlled deceleration as well as acceleration. Disc Cone clutches are available with an 8", 10", 12", and 16" disc and either a Tolomatic P20DA or P220DA caliper disc brake.

Power Transmission Disc Cone Clutches - Clutch Selection