PNS/BF Pneumatic Static-cylinder Multi-disk Clutch

Their simple design includes a central hub, a disk pack, two axial bearings and a fixed cylinder with a working piston. Oil/air under pressure enters through external port «A», a solu-tion which permits the elimination of complicated channeling and allows several clutches to be mounted on the same shaft. Since the cylinder does not rotate, no centrifugal forces are developed in the pressurized oil, thus permitting more rapid coupling and, in particular, uncoupling, which improves intervention frequency. A series of high-spring-rate thrust springs returns the piston rapidly to its neutral position and have little effect on the working thrust.The fixed piston transmits its thrust to the rotating disks through a rugged axial bearing. The stroke of the piston and thrust springs permit disk-wear take-up, thus eliminating the need for adjustment. Since these clutches have all-steel disks and axial bearings, they must operate in an oil bath or under oil-mist conditions. The only situation where they could be operated dry is when the R.P.M. are not very high and the intervention frequency is very low. Since these clutches are designed for operation with oil under pressure, they are ideal for applications on equipment using hydraulics. On request, these clutches are also available for operation with compressed air. The compressed-air versions have a special single seal instead of the two rubber seals used in the oil clutches, which allows compressed-air sealing in the cylinder. In order to avoid any dragging in the neutral position, we can supply, on request, units provided with special diskseparating springs. This feature is particularly useful where the clutch is mounted vertically or in the presence of very sensitive moving parts or when greater uncoupling precision is required.