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Philadelphia Gear's Synchrotorque line includes hydroviscous drives for variable output speed and torque control, as well as clutching, braking and load absorbing. Products are available in horizontal and vertical configurations as both stand-alone assemblies or with built-in step-up or step-down gearing. Equipment enhanced by use with Synchrotorque include pumps, compressors, fans, conveyors, test stands, crusher drives, mill drives and marine propulsion drive trains.


Because Synchrotorque products have 100-percent lockup capability, they offer significant energy savings over other variable speed device types that operate with fixed slip losses. This energy savings represents a significant reduction in lifecycle cost.  And now, with the advent of the Mark VII Controller, Synchrotorque technology has taken another step forward.


Synchrotorque hydroviscous drives operate by shearing an oil film to transmit torque - transmitting in proportion to a variable clamping force. For unrestrained loads, the higher the clamping force, the faster the output speed. The input driveplate functions as the driver, and the output friction disc is faced with a suitably grooved resilient material, acting as the driven member. Precisely controlled clamping pressure between input drives, plates and output friction discs allows for virtually infinite speed control right up to 100-percent of input speed. This is the basis for controlled torque transmission in the Synchrotorque drive.



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Philadelphia Gear Synchrotorque
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Synchrotorque Gear-Pak®
By combining the hydroviscous clutch and gearing in a common housing - the Synchrotorque Gear-Pak - several economies can be realized:

  • Simplified alignment
  • Major drive components eliminated
  • Space savings
  • Reduced foundation cost
  • Reduced total equipment initial cost

Synchrotorque Gear-Pak®


for Horizontal Applications

Synchrodrive for Horizontal Applications is ideal for obtaining variable speed or soft-start capability with existing equipment by locating the Synchrodrive between the existing prime mover and the load device.



Synchrodrive® for Horizontal Applications


for Vertical Applications

Synchrodrive for Vertical Applications is ideal for the best utilization of floor space, by vertically stacking the prime mover, Synchrodrive, and the load device.

Synchrodrive® for Vertical Applications



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