Шестерённый насос внешнего зацепления высокий Performance AZPG

Description Platform G Fixed displacement Size 22 … 100 Continuous pressure up to 250 bar Intermittent pressure up to 280 bar Features 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. 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 chambers is achieved by forces depending on the working pressure. This ensures optimum efficiency. The working pressure generated in the gear chambers is transferred to the outside of the bearing bushings in specifically designed pressure fields in such a way that they are pressed against the gears and seal them up. The pressurized compression areas are limited by special seals. The seal in the area between the gear teeth and the housing is ensured by the smallest of gaps that are set depending on the pressure between the gear teeth and housing. External gear pump layout 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 Gear pumps with integrated valves In order to reduce piping complexity, a flow control valve or pressure-relief valve can be integrated in the cover of the gear pump. Such solutions are used, for instance, for the hydraulic oil supply of power steering systems. The pump delivers a constant flow or maximum pressure irrespective of the rotational speed. The residual flow distributed externally to other consumers. 3-way flow control valve, residual flow returned in suction line qconst = 2 to 30 l/min