Concentric AB-F20/F30 PMP-2011-06 3 LONG-LIFE BEARING SYSTEM F20 Pump Molded sealing gland made of rubber or Viton*. Glass-filled nylon retainer prevents extrusion of sealing gland, has high temperature stability. Flat side faces steel side of wear plate. * Registered trademark of DuPont Co. High pressure metering notches reduce pulsations, quiet pump and system. Groove provides forced-feed bearing lubrication. Bearing surface faces gears, resists seizures. Decompression notches reduce pressure spikes, quiet system. Minimum leakage and wear Concentric pumps utilize two seal packs and two wear plates to minimize leakage across the end faces of the gears and to reduce wear. During startup, the seal packs mechanically preload and seal a cantilever section of the plates against the ends of the gears. The seal packs also establish the wear plate area exposed to system pressure, allowing axial pressure loading and balancing of the cantilever sections. As pressure increases, the sections deflect toward the gear faces to reduce clear ances and balance opposing axial forces. Running clearances are maintained small enough for mimimum leakage across the faces, yet large enough to maintain the oil film required to minimize wear of mating surfaces. Radial imbalance (hydraulic load). Fixed end (minimum deflection). Shaft deflection (exaggerated). Fixed end (minimum deflection). Tapered cross section. Pressure port. Adjustment for deflection Bearings and support structures move in unison with, and adjust to, shafts that are deflected by high hydraulic loads. Optimum bearing alignment, under load, maintains the large-area bearing support required for minimum wear and maximum life of bearings and pump. Inlet port quality products for mechanical & fluid power ~ jbj Techniques Limited, www.jbj.co.uk UK distributor for Concentric Hydraulics
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