Description Platform F Fixed displacement Size 4 … 22 Continuous pressure up to 190 bar Intermittent pressure up to 210 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 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 displacements 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 bushes and the housing with a front and a rear cover. The drive shaft protrudes from the front cover where it is usually sealed by the shaft seal ring. The bearing forces are absorbed by slide bearings. These are designed for high pressures and have excellent dry-running qualities, especially at low rotational speeds. The gear wheels have 12 teeth. This keeps both flow pulsation and noise emission to a minimum. The internal sealing of the pressure chambers is achieved by operating pressure-dependent forces. This ensures optimum efficiency. On the outer face, the movable bearing bushes are pressurized with operating pressure and pressed as seals against the gear wheels. Special seals form the boundary of the pressurized zone. The radial sealing at the tips of the gear teeth against the case is provided by smallest possible gaps that are formed pressure-dependent between the gear wheels and the housing. External gear pump layout 1 Snap 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 Hexagon screws Type code Note Not all of the variants according to the type code are possible. Please select the desired pump with the help of the selection table (preferred types ) or after consultation with Bosch Rexroth. Special options are available on request. Technical data Table of values Size 4 5 8 11 14 16 19 22 Series Series 1x Displacement geometric, per revolution Vg cm³ 4 5.5 8 11 14 16 19 22.5 Pressure at suction port S absolute pe bar 0.7 ... 3 Maximum continuous pressure p1 bar 190 190 190 190 190 190 180 170 Maximum intermittent pressure p2 bar 210 210 210 210 210 210 200 190 Maximum pressure peaks p3 bar 230 230 230 230 230 2
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