Шестерённый насос внешнего зацепления SILENCE AZPS

Description Platform F Fixed displacement Size 4 … 28 Continuous pressure up to 250 bar Intermittent pressure up to 280 bar Features Optimized pressure pulsation, reduces noise emissions and oscillations in the system Consistent high quality based on large-volume production Long service life Slide bearings for high loads Drive shafts according to ISO or SAE and customer-specific solutions Line ports: connection flange or screw thread Combination of several pumps possible Product description General information It is the central task of external gear pumps to convert mechanical energy (torque and speed) into hydraulic energy (flow and pressure). To reduce heat losses, Rexroth’s external gear units offer very high efficiencies. They are realized by pressure-dependent gap sealing and highly precise production technology. Rexroth external gear pumps are built in four frame sizes: Platform B, F, N and G. Within each platform different sizes can be realized by different gear widths. The pumps are available in the versions Standard, High-Performance, SILENCE und SILENCE PLUS. Further configuration variants are given by different flanges, shafts, valve arrangements and multiple pump combinations. Moreover, in the low-noise SILENCE pumps, the dual-flank principle helps to reduce flow pulsation by up to 75 %. Pumping principle The geometry of the displacement gearing, matched in form by the rotation of the drive shaft, results in the parabolic flow characteristic shown here on the left. In a standard pump, this characteristic is repeated each time a gear tooth meshes. With their dual-flank system, the flow pulsation of SILENCE pumps is reduced by 75 % – with correspondingly lower excitation of downstream system components – at double the fundamental frequency. During this process, the gear pair exhibits an extremely reduced rear flank backlash, so that hydraulic ­sealing is provided not just by the front flank of the driven gear, but also by the rear flanks. In this way, the front and rear flanks ­alternately contribute to flow displacement. And by adapting the shape of the metering notches, the expansion of the ­hydraulic line of action is half that of the standard pump. 1 Retaining ring 8 Housing seal ring 2 Shaft seal 9 Pump housing 3 Front cover 10 Bearing bushing 4 Slide bearings 11 Axial field seal 5 Centering pin 12 Supporting element 6 Gear wheel 13 Rear cover 7 Drive shaft 14 Torx screws Construction The external gear pump consists essentially of a pair of gear wheels supported in bearing bushings and the housing with a front cover and an end cover. The drive shaft protrudes from the front cover where it is usually sealed by the shaft seal. The bearing forces are absorbed by slide bearings. These bearings were designed for high pressures and have excellent emergency running properties, especially at low rotational speeds. The gear wheels have 12 teeth. This keeps both flow pulsation and noise emission to a minimum. The sealing of the pressure cham