The Posidyne Size 30 clutch brake from Force Control Industries can be operated as a clutch only for pump or fan applications, or as a clutch brake for cycling or indexing applications. Its “oil shear technology” is designed to dynamically accelerate or decelerate high-inertia loads without wear on friction discs, resulting in maintenance-free, no-downtime operation. By contrast, dry friction clutches or brakes are designed to lock up and tend to show significant wear if used dynamically, the company says.
The system consists of seven basic components: an input shaft connected to the motor or engine, an output shaft connected to the load, a clutch and brake stack consisting of multiple alternating friction discs and drive plates, a piston centrally located between the brake and clutch to engage either one or the other, piston seals, springs that tend to push the piston to the brake side, and transmission fluid.
With the oil shear technology, transmission fluid flowing through the friction stack is put in a shear condition during dynamic engagement. It transmits torque between the friction discs and drive plates, protecting the parts from mechanical contact and absorbing the heat of engagement as it flows through the stack. Upon exiting the stack, the fluid flows down the housing walls where it is cooled and then into the bottom of the unit to re-circulate back into the friction area. The transmission fluid also serves to lubricate the bearings and splines for improved operating life.
The clutch brake is designed to operate nearly maintenance-free for about 40,000,000 cycles. It is suited for bulk materials handling applications such as use on conveyors and load-out conveyors, as well as bulk loading applications like rail car dumpers, portside conveyors and other “no-downtime” applications.
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